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Best Web Developer Certifications of 2022

Certificates are effective skill-based programs curated by industry experts and professionals to equip students with the necessary technical ability to become web developers. The right certifications can help you to take on a range of web development specializations and become proficient in the use of appropriate tools and programs used in the industry.  Below is a curated guide to the popular certificates available for aspiring and practicing web developers.Top Certifications List:Adobe Certified Expert (ACE)    ACE Details and Figures     Zend Certified PHP Engineer   Zend Certified Engineer PHP Data and FiguresMicrosoft Technology Partner (MTA , MCSA)  Microsoft Certified Solutions Developer (MCSD)   AWS Certified Developer   W3 HTML5 Developer Certificate      1. Adobe Certified Expert (ACE)Adobe Certified Expert (ACE) certification confirms professional-level abilities and expertise with one or more of Adobe's graphic design or digital communication products. An education plan including Adobe ACE certification(s) can help prepare for various creative design careers, such as graphic designers or web developers. There are two methods you can become certified. Bachelor Adobe Creative Cloud product like Dreamweaver or Photoshop Complete Adobe Digital Marketing Suite product similar to Adobe Experience Manager or Adobe Campaign Prerequisites:  Normally, ACE certification does not demand any prerequisites. However, candidates are expected to have thorough knowledge of the curriculum topics, before attempting the exam. 2. ACE Details and FiguresCertification Title: Adobe Certified Expert (ACE) Prerequisites & Expected Courses:  No restrictions (typically), although Adobe assumes that candidates have extensive experience with exam topics. Training is recommended (prices range from $900 to $3,600 for virtual and classroom training). Number of Exams:  One per product Cost per Exam: $180. Purchase individual exam vouchers through Adobe Certification Marketplace. Adobe Certification Salary Average salaries for Adobe certified professionals: Adobe Certified Expert salary: $71,000 Adobe Certified Associate salary: $38,000 Source: SimplyHired.comSalaries Based on Experience Graphic Designer - $46k Senior Graphic Designer - $65k Film / Video Editor - $57k Art Director - $73k Creative Director - $91k Graphic Artist / Designer - $47k Video Producer - $51k Source: Payscale.com   ACE Training:Advantages of Adobe Certifications for individuals: Adobe certification is the ideal way to demonstrate your ability in Adobe products. Resumes with Adobe certifications get immediately noticed by hiring managers. Adobe certified professionals gain attention and esteem from colleagues and employers. Adobe certified professionals get exclusive updates on Adobe's most advanced products and innovations. Adobe certified professionals can illustrate Adobe certification logos on their business cards, resumes, and websites to leverage the potential of the Adobe brand.  Advantages of Adobe Certifications for businesses: Adobe certifications allow you to assess a potential hire’s design skills. Businesses can invest in and promote their top employees by getting them Adobe certified. Adobe certifications map to specific products and job roles, so businesses can always find the right person for the job. Demand for ACE certified professionals Adobe Certified Expert (ACE) certification is highly sought after in the field of graphic design or digital communication products. Companies Hiring Adobe Systems Incorporated. ₹1m - ₹2m. Accenture. ₹675k - ₹1m. Sapient Corporation. ₹0 - ₹909k. Tata Consultancy Services Limited. ₹0 - ₹550k. Deloitte Consulting LLP. ₹0 - ₹825k. Self-Study Materials:  A free exam guide, with exam topics, number of questions, sample questions and preparation tips is available on each Exam's webpage. Adobe makes numerous resources available on its training page, including instructor-led and e-learning opportunities, self-assessments and more. 3. Zend Certified PHP EngineerThe Zend Certified PHP Engineer credential is one that is globally trusted in the industry. The certification validates your PHP expertise and increases your employability. PHP is a scripting language that web developers use to create industry-level websites. The exam curriculum incorporates topics in programming, input/output, syntax, data types, and object-oriented programming, amongst others. This certification helps to land lucrative job roles.  Prerequisites: Applicants need to know the technologies used by PHP developers in their file Cost: $195 4. Zend Certified Engineer PHP Data and FiguresCertification Name: Zend Certified PHP Engineer Zend Certification Salary Average salaries for Zend Certification Salary In US is $60-80k In UK it is about $36k,  In Ukraine is $11k per year Source: Ddi-dev.com  Salaries Based on Experience  Senior Software Engineer - $95k - $177k Software Engineer - $66k - $148k Marketing Manager - $65k - $150k Account Executive - $43k - $109k - Sales Operations Manager - $82k - $152k  Technical Architect - $76k - $159k Engagement Manager - $68k - $146k Source: Payscale.com  Prerequisites & Required Courses: None; training recommended Number of Exams: One Cost per Exam: $195. Exam fees may be eligible for reimbursement under the GI bill. Zend TrainingPotential benefits A way of validating PHP skills to potential employers Gain knowledge and expertise in PHP Drawback The construction of some exam questions doesn't prove the expertise of candidates. Demand PHP is a server-side scripting language that is used to develop Static or Dynamic websites, or Web applications.   Companies Hiring Cactus Communications ₹258k - ₹1m Tata Consultancy Services Limited ₹336k - ₹761k Self-Study Materials: Links to exam topics, exam preparation resources, recorded training, virtual instructor-led training, and a reasonably priced study guide ($19.95) are available on the certification webpage. 5. Microsoft Technology PartnerMicrosoft offers outstanding opportunities for training in new software technologies. From their wide suite of recognized certifications, you can explore the most relevant certificate depending on your expertise, skills and abilities. The Microsoft Technology Associate (MTA) certification offers fundamental knowledge to pursue the higher-level Microsoft Certified Solutions Associate (MCSA) or Microsoft Certified Solutions Developer (MCSD) certifications. The MTA certification could make a great entry point for newbies who want to jumpstart their IT careers. The MTA certification is excellent for high school/college students or for anyone new to web development. Exam format: There are various exams for each topic. The questions are in multiple-choice format Cost: $115 Validity: MTA certifications do not expire and have a lifetime validity Benefits of Microsoft Technology Associate (MTA)The MTA Certificate measures the requisite knowledge in the fields of operating system, software development, and database design. This certificate can help professionals mature and be more confident in today’s competitive job market, helping to earn higher salaries. It encourages employees to increase their capability, potency, and reliability with their colleagues and clients. The certificate is a validation of the individual’s ability to immediately take on and add value to projects. The following is a list of advantages of getting Microsoft Certified: Confirm your skills and knowledge Distinguish yourself from competitors Enhance your resume and get noticed Gain recognition and identification from your employer Leverage the potential of the Microsoft brand Demand for Microsoft Technology Associate (MTA) certified professionals This certification is designed for individuals seeking to enter development job roles such as software engineer, computer programmer, web and application developer.   Hiring Companies Microsoft Technology, Nagarro, Accenture, ICS Consultancy, Convergys India, Concentrix, DXC Technology, Wipro, Collabera, Denave, GyanSys Microsoft Certified Solutions Associate (MCSA) Microsoft Certified Solutions Associate (MCSA) is a beginner-level credential from Microsoft that establishes an individual’s expertise and validates knowledge on Microsoft technologies. MCSA is also a prerequisite to attaining higher certifications to accomplish more excellent proficiency and expertise in a subject. It is the beginning of the MCP (Microsoft Certified Professional) certificates and is reasonably necessary in the corporate world to demonstrate a Microsoft product or professional service knowledge. Microsoft Certified Solutions Associate (MCSA) Certification Salary MCSA certification is a stepping stone to advanced certification for the career track. MCSA certification in Microsoft Windows and servers will land on a technical support specialist or a network administrator. Average salaries for Microsoft Certified Solutions Associate (MCSA) Certification Salary 1.In US $86,340 per year Hiring Companies Tata Consultancy Services Limited - ₹343k - ₹935k HCL Technologies Ltd - ₹258k - ₹1m IBM India Private Limited - ₹296k - ₹2m Wipro Technologies Ltd - ₹233k - ₹3m InfoSys Limited - ₹336k - ₹1m  Salaries Based on Experience Systems Administrator - $66k Information Technology (IT) Manager - $85k Senior Systems Administrator - $88k Senior Systems Engineer - $102k Systems Engineer, IT - $76k Network Administrator - $63k Systems Engineer (Computer Networking / IT) - $74k  Microsoft Certified Solutions Associate (MCSA) Training 6. Microsoft Certified Solutions Developer (MCSD)Individuals well versed in Microsoft technologies and possessing hands-on experience, can directly attempt the Microsoft Certified Solutions Developer (MCSD) or Microsoft Certified Solutions Associate (MCSA) certification. There are four tracks in the MCSD: Application lifecycle management, Windows Store Apps, Web Applications, and SharePoint Applications. This credential will help you stand out from other web developers in the market. Cost: $115 per exam Microsoft Certified Solutions Developer (MCSD) Certification Salary Average salaries for Microsoft Certified Solutions Developer (MCSD) Certification Salary In US $99,000 per annum Source: Fieldengineer.comBenefits of Microsoft Certified Solutions Developer (MCSD)  Highlights your resume during the hiring process: Being an MCSD differentiates you from other professionals. It confirms that you are technically certified by the apex authority Microsoft. MCSD doesn’t ensure that a resource is technically qualified; at best, it ensures that he/she has the drive and confidence to acquire and pursue the certification path, which is not so common among developers. MCSD also ensures for the candidate: Better salary and chances of getting promoted Better visibility at the workplace Demand for Microsoft Certified Solutions Developer (MCSD)  The certification validates that individual have the skills needed to build modern mobile and/or web applications and services.   Hiring Companies  Accenture Technology Solutions ₹435k - ₹1m InfoSys Limited ₹380k - ₹1m Accenture ₹381k - ₹1m Tata Consultancy Services Limited ₹300k - ₹1m Capgemini ₹366k - ₹3m Salaries for MCSD based on Experience Software Engineer - $94k Senior Software Engineer - $113k Sr. Software Engineer / Developer / Programmer - $107k Software Developer - $81k Principal Software Engineer - $140k Software Architect - $125k Software Development Manager - $122k Source: Payscale.com 7. AWS Certified Developer This exam is for people with more than one year of experience promoting and maintaining an Amazon Web Service or AWS-based application, who have undertaken web development roles. To get this certification, you will have to pass a multiple-choice exam that will take up to 130 minutes to complete. It will cost you $150 to take this exam, and there is a practice exam available for an additional $20. AWS Certified Developer Salaries Here is a breakdown of average salary earned on the basis of the AWS certificate (U.S. and Canada only): AWS Certified Developer – Associate: $130,272 AWS Certified DevOps Engineer – Professional: $137,724 AWS Certified SysOps Administrator – Associate: $130,610 AWS Certified Solutions Architect – Associate: $130,883 AWS Certified Solutions Architect – Professional: $148,456 Source: 2019 IT Skills & Salary Survey by Global Knowledge AWS Certified Developer Exam Cost Exam Cost: 150 USD (approx INR 10,439) Exam Format: Multiple Choice, Multiple-Answer Validity: 3 years Benefits of AWS Certified Developer credential You will have proven abilities and expertise in the preeminent cloud computing platform. You will be consistently placed among the top-paying info-tech professionals worldwide. With this credential, you can validate your reliability and dedication to the cloud engineering profession path. The credential helps you to network with like-minded peers and AWS thought-leaders. It ensures that your AWS skills remain current. Hiring Companies Microsoft, Teradata, Amazon, Deloitte AWS Certified Developer Training AWS Certification Exam  AWS Certified Solutions Architect- Associate Training8. W3 HTML5 Developer Certificate This web development certification validates your expertise to create highly interactive apps using HTML5, XHTML, and CSS. It is accepted internationally and is used by web design professionals as a key certification to prove their knowledge of foundational principles.  Exam format: The exam has a 70-minute duration and comprises of 70 multiple choice questions, with a minimum passing score of 70%. Cost: $95 W3 HTML5 Developer Salaries In US $58,312 PA Source: Payscale.com SummaryA certificate in web development is an excellent way to open doors to lucrative job opportunities. To get certified, you will need to invest time and effort, but it will lead to enduring benefits which make it worth your while. There are some wonderful training institutes that help you prepare for the exams and gain hands-on working knowledge of the technologies. Certifications can distinguish you from non-certified peers and help you to land better job roles. In this competitive job market, a credential might be all you need to get ahead – take the first step today!  

Best Web Developer Certifications of 2022

5K
Best Web Developer Certifications of 2022

Certificates are effective skill-based programs curated by industry experts and professionals to equip students with the necessary technical ability to become web developers. The right certifications can help you to take on a range of web development specializations and become proficient in the use of appropriate tools and programs used in the industry.  

Below is a curated guide to the popular certificates available for aspiring and practicing web developers.

Top Certifications List:

  1. Adobe Certified Expert (ACE)    

  2. ACE Details and Figures 
     
     
     

  3. Zend Certified PHP Engineer   

  4. Zend Certified Engineer PHP Data and Figures

  5. Microsoft Technology Partner (MTA MCSA)  

  6. Microsoft Certified Solutions Developer (MCSD)   

  7. AWS Certified Developer   

  8. W3 HTML5 Developer Certificate      


1. Adobe Certified Expert (ACE)

Adobe Certified Expert (ACE) certification confirms professional-level abilities and expertise with one or more of Adobe's graphic design or digital communication products. An education plan including Adobe ACE certification(s) can help prepare for various creative design careers, such as graphic designers or web developers. There are two methods you can become certified. 

  • Bachelor Adobe Creative Cloud product like Dreamweaver or Photoshop 
  • Complete Adobe Digital Marketing Suite product similar to Adobe Experience Manager or Adobe Campaign 

Prerequisites:  

Normally, ACE certification does not demand any prerequisites. However, candidates are expected to have thorough knowledge of the curriculum topics, before attempting the exam. 

2. ACE Details and Figures

  • Certification Title: Adobe Certified Expert (ACE) 
  • Prerequisites & Expected Courses:  No restrictions (typically), although Adobe assumes that candidates have extensive experience with exam topics. Training is recommended (prices range from $900 to $3,600 for virtual and classroom training). 
  • Number of Exams:  One per product 
  • Cost per Exam: $180. Purchase individual exam vouchers through Adobe Certification Marketplace. 

Adobe Certification Salary 

Average salaries for Adobe certified professionals: 

  1. Adobe Certified Expert salary: $71,000 
  2. Adobe Certified Associate salary: $38,000 

Source: SimplyHired.com

Salaries Based on Experience 

  1. Graphic Designer - $46k 
  2. Senior Graphic Designer - $65k 
  3. Film / Video Editor - $57k 
  4. Art Director - $73k 
  5. Creative Director - $91k 
  6. Graphic Artist / Designer - $47k 
  7. Video Producer - $51k 

Source: Payscale.com   

ACE Training:

Advantages of Adobe Certifications for individuals: 

  • Adobe certification is the ideal way to demonstrate your ability in Adobe products. 
  • Resumes with Adobe certifications get immediately noticed by hiring managers. 
  • Adobe certified professionals gain attention and esteem from colleagues and employers. 
  • Adobe certified professionals get exclusive updates on Adobe's most advanced products and innovations. 
  • Adobe certified professionals can illustrate Adobe certification logos on their business cards, resumes, and websites to leverage the potential of the Adobe brand. 

 Advantages of Adobe Certifications for businesses: 

  • Adobe certifications allow you to assess a potential hire’s design skills. 
  • Businesses can invest in and promote their top employees by getting them Adobe certified. 
  • Adobe certifications map to specific products and job roles, so businesses can always find the right person for the job. 

Demand for ACE certified professionals 

Adobe Certified Expert (ACE) certification is highly sought after in the field of graphic design or digital communication products. 

Companies Hiring 

  1. Adobe Systems Incorporated. ₹1m - ₹2m. 
  2. Accenture. ₹675k - ₹1m. 
  3. Sapient Corporation. ₹0 - ₹909k. 
  4. Tata Consultancy Services Limited. ₹0 - ₹550k. 
  5. Deloitte Consulting LLP. ₹0 - ₹825k. 

Self-Study Materials:  A free exam guide, with exam topics, number of questions, sample questions and preparation tips is available on each Exam's webpage. Adobe makes numerous resources available on its training page, including instructor-led and e-learning opportunities, self-assessments and more. 

3. Zend Certified PHP Engineer

The Zend Certified PHP Engineer credential is one that is globally trusted in the industry. The certification validates your PHP expertise and increases your employability. PHP is a scripting language that web developers use to create industry-level websites. The exam curriculum incorporates topics in programming, input/output, syntax, data types, and object-oriented programming, amongst others. This certification helps to land lucrative job roles.  

  • Prerequisites: Applicants need to know the technologies used by PHP developers in their file 
  • Cost: $195 

4. Zend Certified Engineer PHP Data and Figures

  • Certification Name: Zend Certified PHP Engineer 

Zend Certification Salary 

Average salaries for Zend Certification Salary 

  1. In US is $60-80k 
  2. In UK it is about $36k,  
  3. In Ukraine is $11k per year 

Source: Ddi-dev.com  

Salaries Based on Experience  

  1. Senior Software Engineer - $95k - $177k 
  2. Software Engineer - $66k - $148k 
  3. Marketing Manager - $65k - $150k 
  4. Account Executive - $43k - $109k - 
  5. Sales Operations Manager - $82k - $152k  
  6. Technical Architect - $76k - $159k 
  7. Engagement Manager - $68k - $146k 

Source: Payscale.com  

  • Prerequisites & Required Courses: None; training recommended 
  • Number of Exams: One 
  • Cost per Exam: $195. Exam fees may be eligible for reimbursement under the GI bill. 

Zend Training

Potential benefits 

  1. A way of validating PHP skills to potential employers 
  2. Gain knowledge and expertise in PHP 

Drawback 

  1. The construction of some exam questions doesn't prove the expertise of candidates. 

Demand 

PHP is a server-side scripting language that is used to develop Static or Dynamic websites, or Web applications.   

Companies Hiring 

  1. Cactus Communications ₹258k - ₹1m 
  2. Tata Consultancy Services Limited ₹336k - ₹761k 

Self-Study Materials: Links to exam topics, exam preparation resources, recorded training, virtual instructor-led training, and a reasonably priced study guide ($19.95) are available on the certification webpage. 

5. Microsoft Technology Partner

Microsoft offers outstanding opportunities for training in new software technologies. From their wide suite of recognized certifications, you can explore the most relevant certificate depending on your expertise, skills and abilities. 

The Microsoft Technology Associate (MTA) certification offers fundamental knowledge to pursue the higher-level Microsoft Certified Solutions Associate (MCSA) or Microsoft Certified Solutions Developer (MCSD) certifications. 

The MTA certification could make a great entry point for newbies who want to jumpstart their IT careers. The MTA certification is excellent for high school/college students or for anyone new to web development. 

  • Exam format: There are various exams for each topic. The questions are in multiple-choice format 
  • Cost: $115 
  • Validity: MTA certifications do not expire and have a lifetime validity 

Benefits of Microsoft Technology Associate (MTA)

The MTA Certificate measures the requisite knowledge in the fields of operating system, software development, and database design. This certificate can help professionals mature and be more confident in today’s competitive job market, helping to earn higher salaries. It encourages employees to increase their capability, potency, and reliability with their colleagues and clients. The certificate is a validation of the individual’s ability to immediately take on and add value to projects. 

The following is a list of advantages of getting Microsoft Certified: 

  1. Confirm your skills and knowledge 
  2. Distinguish yourself from competitors 
  3. Enhance your resume and get noticed 
  4. Gain recognition and identification from your employer 
  5. Leverage the potential of the Microsoft brand 

Demand for Microsoft Technology Associate (MTA) certified professionals 

This certification is designed for individuals seeking to enter development job roles such as software engineer, computer programmer, web and application developer.   

Hiring Companies 

Microsoft Technology, Nagarro, Accenture, ICS Consultancy, Convergys India, Concentrix, DXC Technology, Wipro, Collabera, Denave, GyanSys 

Microsoft Certified Solutions Associate (MCSA) 

Microsoft Certified Solutions Associate (MCSA) is a beginner-level credential from Microsoft that establishes an individual’s expertise and validates knowledge on Microsoft technologies. MCSA is also a prerequisite to attaining higher certifications to accomplish more excellent proficiency and expertise in a subject. It is the beginning of the MCP (Microsoft Certified Professional) certificates and is reasonably necessary in the corporate world to demonstrate a Microsoft product or professional service knowledge. 

Microsoft Certified Solutions Associate (MCSA) Certification Salary 

MCSA certification is a stepping stone to advanced certification for the career track. MCSA certification in Microsoft Windows and servers will land on a technical support specialist or a network administrator. 

Average salaries for Microsoft Certified Solutions Associate (MCSA) Certification Salary 

1.In US $86,340 per year 

Hiring Companies 

  1. Tata Consultancy Services Limited - ₹343k - ₹935k 
  2. HCL Technologies Ltd - ₹258k - ₹1m 
  3. IBM India Private Limited - ₹296k - ₹2m 
  4. Wipro Technologies Ltd - ₹233k - ₹3m 
  5. InfoSys Limited - ₹336k - ₹1m 

 Salaries Based on Experience 

  1. Systems Administrator - $66k 
  2. Information Technology (IT) Manager - $85k 
  3. Senior Systems Administrator - $88k 
  4. Senior Systems Engineer - $102k 
  5. Systems Engineer, IT - $76k 
  6. Network Administrator - $63k 
  7. Systems Engineer (Computer Networking / IT) - $74k  

Microsoft Certified Solutions Associate (MCSA) Training 

6. Microsoft Certified Solutions Developer (MCSD)

Individuals well versed in Microsoft technologies and possessing hands-on experience, can directly attempt the Microsoft Certified Solutions Developer (MCSD) or Microsoft Certified Solutions Associate (MCSA) certification. 

There are four tracks in the MCSD: Application lifecycle management, Windows Store Apps, Web Applications, and SharePoint Applications. This credential will help you stand out from other web developers in the market. 

  • Cost: $115 per exam 

Microsoft Certified Solutions Developer (MCSD) Certification Salary 

Average salaries for Microsoft Certified Solutions Developer (MCSD) Certification Salary 

  • In US $99,000 per annum 

Source: Fieldengineer.com

Benefits of Microsoft Certified Solutions Developer (MCSD)  

Highlights your resume during the hiring process: Being an MCSD differentiates you from other professionals. It confirms that you are technically certified by the apex authority Microsoft. MCSD doesn’t ensure that a resource is technically qualified; at best, it ensures that he/she has the drive and confidence to acquire and pursue the certification path, which is not so common among developers. 

MCSD also ensures for the candidate: 

  1. Better salary and chances of getting promoted 
  2. Better visibility at the workplace 

Demand for Microsoft Certified Solutions Developer (MCSD)  

The certification validates that individual have the skills needed to build modern mobile and/or web applications and services.   

Hiring Companies  

  1. Accenture Technology Solutions ₹435k - ₹1m 
  2. InfoSys Limited ₹380k - ₹1m 
  3. Accenture ₹381k - ₹1m 
  4. Tata Consultancy Services Limited ₹300k - ₹1m 
  5. Capgemini ₹366k - ₹3m 

Salaries for MCSD based on Experience 

  1. Software Engineer - $94k 
  2. Senior Software Engineer - $113k 
  3. Sr. Software Engineer / Developer / Programmer - $107k 
  4. Software Developer - $81k 
  5. Principal Software Engineer - $140k 
  6. Software Architect - $125k 
  7. Software Development Manager - $122k 

Source: Payscale.com 

7. AWS Certified Developer 

This exam is for people with more than one year of experience promoting and maintaining an Amazon Web Service or AWS-based application, who have undertaken web development roles. 

To get this certification, you will have to pass a multiple-choice exam that will take up to 130 minutes to complete. It will cost you $150 to take this exam, and there is a practice exam available for an additional $20. 

AWS Certified Developer Salaries 

Here is a breakdown of average salary earned on the basis of the AWS certificate (U.S. and Canada only): 

  1. AWS Certified Developer – Associate: $130,272 
  2. AWS Certified DevOps Engineer – Professional: $137,724 
  3. AWS Certified SysOps Administrator – Associate: $130,610 
  4. AWS Certified Solutions Architect – Associate: $130,883 
  5. AWS Certified Solutions Architect – Professional: $148,456 

Source: 2019 IT Skills & Salary Survey by Global Knowledge 

AWS Certified Developer Exam Cost 

  1. Exam Cost: 150 USD (approx INR 10,439) 
  2. Exam Format: Multiple Choice, Multiple-Answer 
  3. Validity: 3 years 

Benefits of AWS Certified Developer credential 

  1. You will have proven abilities and expertise in the preeminent cloud computing platform. 
  2. You will be consistently placed among the top-paying info-tech professionals worldwide. 
  3. With this credential, you can validate your reliability and dedication to the cloud engineering profession path. 
  4. The credential helps you to network with like-minded peers and AWS thought-leaders. 
  5. It ensures that your AWS skills remain current. 

Hiring Companies 

Microsoft, Teradata, Amazon, Deloitte 

AWS Certified Developer Training 

  1. AWS Certification Exam  
  2. AWS Certified Solutions Architect- Associate Training

8. W3 HTML5 Developer Certificate 

This web development certification validates your expertise to create highly interactive apps using HTML5, XHTML, and CSS. It is accepted internationally and is used by web design professionals as a key certification to prove their knowledge of foundational principles.  

  • Exam format: The exam has a 70-minute duration and comprises of 70 multiple choice questions, with a minimum passing score of 70%. 
  • Cost: $95 

W3 HTML5 Developer Salaries 

  • In US $58,312 PA 

SourcePayscale.com 

Summary

A certificate in web development is an excellent way to open doors to lucrative job opportunities. To get certified, you will need to invest time and effort, but it will lead to enduring benefits which make it worth your while. There are some wonderful training institutes that help you prepare for the exams and gain hands-on working knowledge of the technologies. 

Certifications can distinguish you from non-certified peers and help you to land better job roles. In this competitive job market, a credential might be all you need to get ahead – take the first step today!  

KnowledgeHut

KnowledgeHut

Author

KnowledgeHut is an outcome-focused global ed-tech company. We help organizations and professionals unlock excellence through skills development. We offer training solutions under the people and process, data science, full-stack development, cybersecurity, future technologies and digital transformation verticals.
Website : https://www.knowledgehut.com

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Handling React Events - A Detailed Guide

Event handling essentially allows the user to interact with a webpage and do something specific when a certain event like a click or a hover happens. When the user interacts with the application, events are fired, for example, mouseover, key press, change event, and so on. The application must handle events and execute the code. In short, events are the actions to which javascript can respond.   The actions to which javascript can respond are called events. Handling events with react is  very similar to handling events in DOM elements. Below are some general events that you would see in and out when dealing with react based websites:  Clicking an element  Submitting a form Scrolling page Hovering an element  Loading a webpage Input field change User stroking a key Image loading Naming Events in React Handling events with react is very similar to handling events in DOM elements, although there are some syntactic differences.   React events are written in camelCase.   A function is passed as the event handler rather than string. The way to write events in html / DOM is below:        click me onclick is written in lower case in html as shown above and what action to take when this onclick event triggers is taken care of by handleClick.In React, events are named using camel case and you pass a function as event handler as shown below:  Like in a functional component, event is written like below:       click me   In class based component ,event is written like below        click me Defining Events:Events are normally used in combination with functions, and the function is not executed until the event occurs, and the combination of event, HTML element, and javascript function is called binding which means to map all three. Generic syntax is:      Example:  Create a button element and what happens when onClick event triggered is driven by the function which is func() shown below     click me Let’s see some of the event attributes:   onmouseover : The mouse is moved over an element onmouseup : The mouse button is released onmouseout : The mouse  is moved off an element onmousemove: The mouse is moved Onmousedown: mouse button is pressed  onload : A image is done loading onunload: Existing the page  onblur : Losing Focus  on element  onchange : Content of a field changes onclick: Clicking an object  ondblclick: double clicking an object  onfocus element getting a focus  Onkeydown: pushing a keyboard key Onkeyup: keyboard key is released Onkeypress: keyboard key is pressed  Onselect: text is selected These are some examples of events:                                         Events                               function testApp (){                        alert((“Hello Event”);                                                   test Clicked                  test double Clicked                     Synthetic Events When you specify an event in JSX, you are not directly dealing with regular DOM events, you are dealing with a react event type called a synthetic event.It's a simple wrapper for native event instances and every synthetic event created needs to be garbage-collected which can be resource intensive in terms of CPU. The synthetic event object has properties mentioned below:  Boolean isTrusted  DOMEvent nativeEvent number timeStamp   void preventDefault() number eventPhase Synthetic events provide an interface and reduce browser inconsistencies and the event contains required information for its propagation to work. Synthetic event is reused for performance reasons in the browser, A synthetic event is a cross-browser wrapper around the browser’s native event it has the same interface as the native event. Synthetic events are delegated to the document node. Therefore native events are triggered first and the events bubble up to document, after which the synthetic events are triggered. The synthetic event object will be reused and all the properties will be nullified after the event callback has been invoked and this is for performance reasons.The workflow of synthetic event in react is:    Element ---- > Event ---- > synthetic event  ---- > handler(e)                                |                                                      |                                |  _______  Component ________|  umber timeStamp The Basics of React Event Handling Let’s explore how to handle events in react and we will showcase the click event and how it holds good for other types of events. Let’s start with functional components by creating a  file as clickAppHandler.js.In this file let’s create a  functional component  as shown below                        Import React from ‘...react’                         function clickAppHandler() {                                function clickHandler() {                                        console.log(‘clicked’)                                         }                                  return (                                                                                  Click                                                                          )                         }                       export default clickAppHandler  When onClick event triggers clickHandler function is called as shown below and when you click the button console will print the string “clicked” After this you need the add a component in the app component. In our code above you can see on click we pass the function as event handler and you will notice that we haven't added parentheses as it becomes a function, and we do not want that and we want handler to be a function not a function call. When a new component is rendered its event handler functions are added to the mapping maintained by the react.When the event is triggered and it hits and DOM object ,react maps the event to the handler, if it matches it calls the handler. The event handling in react is declarative and the advantage of declarative way to handlers is that they are part of the User interface structure.  Let’s take a look at event handling in class components                       Import React, { Component } from ‘...react’                         class TestApp extends Component {                              clickHandler() {                                  console.log(“clicked”)                                }                                render(){                                      return(                                                                                     Click me                                                                                 )                                 }                            }                       export default TestApp You cannot return false to prevent default behaviour in React. You must call preventDefault explicitly.  In HTML it looks like below:    Click Output: It will print “Clicked”  And in React, like this:  function clickHandle(e) {       e.preventDefault();       console.log(“Handled”);   }  Click  Output : console will print “Handled”  There are some  event handlers triggered by an event in the bubbling phase which is the same as with the normal DOM API; simply attach a handler to an eventual parent of an element and any events triggered on that element will bubble to the parent as long as it's not stopped via stopPropagation along the way   Click me  Below are some of the event handlers triggered in the bubbling phase:  MouseEvents           onClick           onDrag          onDoubleClick Keyboard Events                    onKeyDown                    onKeyPress                    onKeyUp Focus Events                  onFocus   onBlur To capture an event handler for the capture phase, append capture to the event name. For example, instead of using onClick, use onClickCapture to handle the click event.  Capture event example:                  Click me    Additional ExamplesExample1                       Import React from ‘...react’                         function clickAppHandler() {                                function clickHandler() {                                        console.log(‘clicked’)                                         }                                  return (                                                                                  Click                                                                          )                         }                       export default clickAppHandler   Example2       This example is along with HTML in a single file                                                            Events                               function testApp (){                        alert((“Hello Event”);                                                   test Clicked                  test double Clicked                     Adding Events: Below example is how you add an event. Highlighted in bold                      Import React from ‘...react’                         function clickAppHandler() {                                function clickHandler() {                                        console.log(‘clicked’)                                         }                                  return (                                                                                  Click                                                                          )                         }                       export default clickAppHandler  Passing Arguments to Event HandlerThere are two ways arguments are passed to event handler  Arrow function                    this.handleClick(id,e)}>Click                onClick is the event                e is the event object                 id can be state or props or some data Bind method      Click  In this case event object is automatically passed In both methods e represents the react event and its passed after the ID as second argument,With an arrow function this event e is passed explicitly but with bind method its automatically passed.                                     Import React,{ Component } from “react”;                                         class TestApp extends Component {                                           state = {                                                       id: 2,                                                      Name: “TestApp Dummy”                                                };                                                             //arrow function                                                 handleClick = (id,e) => {                                                       console.log(id);                                                       console.log(e);                                                  };                                               handleArg = (e) => { this.handleClick(this.state.id,e);}                                                          render() {     return (                    TestApp,{this.state.name}            onClick={this.handleArg}>Display            );   }  }  The react event is an object and obtained from react. Instead of creating a separate function for passing argument, you can directly pass the anonymous arrow function as shown in the render function below:     render() {        return (                                                                                                       TestApp,{this.state.name}                                                {                           this.handleClick(this.state.id,e);                                                               }}>Display                                                                                                         );                                                 }                                            }    Output:   click on button  “TestApp Dummy “                   Let’s see only how bind method looks like in the render function    render() {                                         return (                                                                                                 TestApp,{this.state.name}                                                   Display                                                                                                       );                                                  }                                              } Output: this will display the h1 tag and when you click the button handleClick function gets invoked and the console will display id of the state object as shown above. Building a Practice to Thoroughly Understand Events This blog focuses on event handling, which in turn teaches about event handlers declared in JSX markup.This approach helps in tracking down the element mapped with events in an easy way.  We also learned how to handle multiple event handlers in a single element by using JSX attributes.we also learned about ways to bind event handler and  parameter values. Then we learned about synthetic events which are abstractions around native events. The best way you can retain this learning is by practicing more and tackling the complexities that may arise as you practice. You can find several tutorials on the internet or share your questions with us here. Happy learning! 
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Handling React Events - A Detailed Guide

Event handling essentially allows the user to inte... Read More

MongoDB Query Document Using Find() With Example

MongoDB's find() method selects documents from a collection or view and returns a cursor to those documents. There are two parameters in this formula: query and projection.Query – This is an optional parameter that specifies the criteria for selection. In simple terms, a query is what you want to search for within a collection.Projection – This is an optional parameter that specifies what should be returned if the query criteria are satisfied. In simple terms, it is a type of decision-making that is based on a set of criteria.MongoDB's Flexible SchemaA NoSQL database, which stands for "not only SQL," is a way of storing and retrieving data that is different from relational databases' traditional table structures (RDBMS).When storing large amounts of unstructured data with changing schemas, NoSQL databases are indeed a better option than RDBMS. Horizontal scaling properties of NoSQL databases allow them to store and process large amounts of data.These are intended for storing, retrieving, and managing document-oriented data, which is frequently stored in JSON format (JavaScript Object Notation). Document databases, unlike RDBMSs, have a flexible schema that is defined by the contents of the documents.MongoDB is one of the most widely used open-source NoSQL document databases. MongoDB is known as a 'schemaless' database because it does not impose a specific structure on documents in a collection.MongoDB is compatible with a number of popular programming languages. It also offers a high level of operational flexibility because it scales well horizontally, allowing data to be spread or 'sharded' across multiple commodity servers with the ability to add more servers as needed. MongoDB can be run on a variety of platforms, including developer laptops, private clouds, and public clouds.Querying documents using find()MongoDB queries are used to retrieve or fetch data from a MongoDB database. When running a query, you can use criteria or conditions to retrieve specific data from the database.The function db.collection is provided by MongoDB. find() is a function that retrieves documents from a MongoDB database.In MongoDB, the find method is used to retrieve a specific document from the MongoDB collection. In Mongo DB, there are a total of six methods for retrieving specific records.find()findAndModify()findOne()findOneAndDelete()findOneAndReplace()findOneAndUpdate()Syntax:find(query, projection)We can fetch a specific record using the Find method, which has two parameters. If these two parameters are omitted, the find method will return all of the documents in the MongoDB collection.Example:Consider an example of employees with the database of employee_id and employee_name and we will fetch the documents using find() method.First, create a database with the name “employees” with the following code:use employeesNow, create a collection “employee” with:db.createCollection("employee")In the next step we will insert the documents in the database:db.employee.insert([{employee_id: 101, employee_name: "Ishan"}, {employee_id: 102, employee_name: "Bhavesh"}, {employee_id: 103, employee_name: "Madan"}])Find all Documents:To get all the records in a collection, we need to use the find method with an empty parameter. In other words, when we need all the records, we will not use any parameters.db.employee.find()Output in Mongo ShellThe pretty() method can be used to display the results in a formatted manner.Syntax:db.COLLECTION_NAME.find().pretty()Let’s check our documents with pretty() method:Query FiltersWe will see examples of query operations using the db.collection.find() method in mongosh.We will use the employee collection in the employees database.db.employee.insert([{employee_id: 101, employee_name: "Ishan", age: 21, email_id: "ishanjain@gmail.com"}, {employee_id: 102, employee_name: "Bhavesh", age: 22, email_id: "bhaveshg@gmail.com"}, {employee_id: 103, employee_name: "Madan", age: 23, email_id: "madan@gmail.com"}])As we have seen earlier that to select all the documents in the database we pass an empty document as the query filter parameter to the find method.db.employee.find().pretty()Find the first document in a collection:db.employee.findOne()Find a document by ID:db.employee.findOne({_id : ObjectId("61d1ae0b56b92c20b423a5a7")})Find Documents that Match Query Criteriadb.employee.find({“age”: “22”})db.employee.find({"employee_name": "Madan"}).pretty()Sort Results by a Field:db.employee.find().sort({age: 1}).pretty()order by age, in ascending orderdb.employee.find().sort({age: -1}).pretty()order by age, in descending orderAND Conditions:A compound query can specify conditions for multiple fields in the documents in a collection. A logical AND conjunction connects the clauses of a compound query indirectly, allowing the query to select all documents in the collection that meet the specified conditions.In the following example, we will consider all the documents in the employee collection where employee_id equals 101 and age equals 21.db.employee.find({"employee_id": 101, "age": "21" }).pretty()Querying nested fieldsThe embedded or nested document feature in MongoDB is a useful feature. Embedded documents, also known as nested documents, are documents that contain other documents.You can simply embed a document inside another document in MongoDB. Documents are defined in the mongo shell using curly braces (), and field-value pairs are contained within these curly braces.Using curly braces, we can now embed or set another document inside these fields, which can include field-value pairs or another sub-document.Syntax:{ field: { field1: value1, field2: value2 } }Example:We have a database “nested” and in this database we have collection “nesteddoc”.The following documents will insert into the nesteddoc collection.db.nesteddoc.insertMany([ { "_id" : 1, "dept" : "A", "item" : { "sku" : "101", "color" : "red" }, "sizes" : [ "S", "M" ] }, { "_id" : 2, "dept" : "A", "item" : { "sku" : "102", "color" : "blue" }, "sizes" : [ "M", "L" ] }, { "_id" : 3, "dept" : "B", "item" : { "sku" : "103", "color" : "blue" }, "sizes" : "S" }, { "_id" : 4, "dept" : "A", "item" : { "sku" : "104", "color" : "black" }, "sizes" : [ "S" ] } ])Place the documents in the collection now. Also, take a look at the results:As a result, the nesteddoc collection contains four documents, each of which contains nested documents. The find() method can be used to access the collection's documents.db.nesteddoc.find()Specify Equality Condition:In this example, we will select the document from the nesteddoc query where dept equals “A”.db.nesteddoc.find({dept: "A"})Querying ArraysUse the query document {: } to specify an equality condition on an array, where is the exact array to match, including the order of the elements.The following query looks for all documents where the field tags value is an array with exactly two elements, "S" and "M," in the order specified:db.nesteddoc.find( { sizes: ["S", "M"] } )Use the $all operator to find an array that contains both the elements "S" and "M," regardless of order or other elements in the array:db.nested.find( { sizes: { $all: ["S", "M"] } } )Query an Array for an Element:The following example queries for all documents where size is an array that contains the string “S” as one of its elements:db.nesteddoc.find( { sizes: "S" } )Filter conditionsTo discuss the filter conditions, we will consider a situation that elaborates this. We will start by creating a collection with the name “products” and then add the documents to it.db.products.insertMany([ { _id: 1, item: { name: "ab", code: "123" }, qty: 15, tags: [ "A", "B", "C" ] }, { _id: 2, item: { name: "cd", code: "123" }, qty: 20, tags: [ "B" ] }, { _id: 3, item: { name: "ij", code: "456" }, qty: 25, tags: [ "A", "B" ] }, { _id: 4, item: { name: "xy", code: "456" }, qty: 30, tags: [ "B", "A" ] }, { _id: 5, item: { name: "mn", code: "000" }, qty: 20, tags: [ [ "A", "B" ], "C" ] }])To check the documents, use db.products.find():$gt$gt selects documents with a field value greater than (or equal to) the specified value.db.products.find( { qty: { $gt: “20” } } )$gte:$gte finds documents in which a field's value is greater than or equal to (i.e. >=) a specified value (e.g. value.)db.products.find( { qty: { $gte: 20 } } )$lt:$lt selects documents whose field value is less than (or equal to) the specified value.db.products.find( { qty: { $lt: 25 } } )$lte:$lte selects documents in which the field's value is less than or equal to (i.e. =) the specified value.db.products.find( { qty: { $lte: 20 } } )Query an Array by Array Length:To find arrays with a specific number of elements, use the $size operator. For example, the following selects documents with two elements in the array.db.products.find( { "tags": {$size: 2} } )ProjectionIn MongoDB, projection refers to selecting only the data that is required rather than the entire document's data. If a document has five fields and you only want to show three of them, select only three of them.The find() method in MongoDB accepts a second optional parameter, which is a list of fields to retrieve, as explained in MongoDB Query Document. When you use the find() method in MongoDB, it displays all of a document's fields. To prevent this, create a list of fields with the values 1 or 0. The value 1 indicates that the field should be visible, while 0 indicates that it should be hidden.Syntax:db.COLLECTION_NAME.find({},{KEY:1})Example:We will consider the previous example of products collection. Run the below command on mongoshell to learn how projection works:db.products.find({},{"tags":1, _id:0})Keep in mind that the _id field is always displayed while executing the find() method; if you do not want this field to be displayed, set it to 0.Optimized FindingsTo retrieve a document from a MongoDB collection, use the Find method.Using the Find method, we can retrieve specific documents as well as the fields that we require. Other find methods can also be used to retrieve specific documents based on our needs.By inserting array elements into the query, we can retrieve specific elements or documents. To retrieve data for array elements from the collection in MongoDB, we can use multiple query operators.
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MongoDB Query Document Using Find() With Example

MongoDB's find() method selects documents from a c... Read More

Implementing MongoDb Map Reduce using Aggregation

Algorithms and applications in today's data-driven market collect data about people, processes, systems, and organisations 24 hours a day, seven days a week, resulting in massive amounts of data. The problem is figuring out how to process this massive amount of data efficiently without sacrificing valuable insights.What is Map Reduce? The MapReduce programming model comes to the rescue here. MapReduce, which was first used by Google to analyse its search results, has grown in popularity due to its ability to split and process terabytes of data in parallel, generating results faster. A (Key,value) pair is the basic unit of information in MapReduce. Before feeding the data to the MapReduce model, all types of structured and unstructured data must be translated to this basic unit. The MapReduce model, as the name implies, consists of two distinct routines: the Map-function and the Reduce-function.  MapReduce is a framework for handling parallelizable problems across huge files using a huge number of devices (nodes), which are collectively referred to as a cluster (if all nodes are on the same local network and use similar hardware) or a grid (if the nodes are shared across geographically and administratively distributed systems, and use more heterogeneous hardware).  When data stored in a filesystem (unstructured) or a database(structured) is processed, MapReduce can take advantage of data's locality, processing it close to where it's stored to reduce communication costs. Typically, a MapReduce framework (or system) consists of three operations: Map: Each worker node applies the map function to local data and saves the result to a temporary storage. Only one copy of the redundant input data is processed by a master node. Shuffle: worker nodes redistribute data based on output keys (produced by the map function), ensuring that all data associated with a single key is stored on the same worker node. Reduce: each group of output data is now processed in parallel by worker nodes, per key. This article will walk you through the Map-Reduce model's functionality step by step. Map Reduce in MongoDB The map-reduce operation has been deprecated since MongoDB 5.0. An aggregation pipeline outperforms a map-reduce operation in terms of performance and usability. Aggregation pipeline operators like $group, $merge, and others can be used to rewrite map-reduce operations. Starting with version 4.4, MongoDB provides the $accumulator and $function aggregation operators for map-reduce operations that require custom functionality. In JavaScript, use these operators to create custom aggregation expressions. The map and reduce functions are the two main functions here. As a result, the data is independently mapped and reduced in different spaces before being combined in the function and saved to the specified new collection. This mapReduce() function was designed to work with large data sets only. You can perform aggregation operations like max and avg on data using Map Reduce, which is similar to groupBy in SQL. It works independently and in parallel on data. Implementing Map Reduce with Mongosh (MongoDB Shell)  The db.collection.mapReduce() method in mongosh is a wrapper for the mapReduce command. The examples that follow make use of the db.collection.mapReduce(). Example: Create a collection ‘orders’ with these documents: db.orders.insertMany([     { _id: 1, cust_id: "Ishan Jain", ord_date: new Date("2021-11-01"), price: 25, items: [ { sku: "oranges", qty: 5, price: 2.5 }, { sku: "apples", qty: 5, price: 2.5 } ], status: "A" },     { _id: 2, cust_id: "Ishan Jain", ord_date: new Date("2021-11-08"), price: 70, items: [ { sku: "oranges", qty: 8, price: 2.5 }, { sku: "chocolates", qty: 5, price: 10 } ], status: "A" },     { _id: 3, cust_id: "Bhavesh Galav", ord_date: new Date("2021-11-08"), price: 50, items: [ { sku: "oranges", qty: 10, price: 2.5 }, { sku: "pears", qty: 10, price: 2.5 } ], status: "A" },     { _id: 4, cust_id: "Bhavesh Galav", ord_date: new Date("2021-11-18"), price: 25, items: [ { sku: "oranges", qty: 10, price: 2.5 } ], status: "A" },     { _id: 5, cust_id: "Bhavesh Galav", ord_date: new Date("2021-11-19"), price: 50, items: [ { sku: "chocolates", qty: 5, price: 10 } ], status: "A"},     { _id: 6, cust_id: "Madan Parmar", ord_date: new Date("2021-11-19"), price: 35, items: [ { sku: "carrots", qty: 10, price: 1.0 }, { sku: "apples", qty: 10, price: 2.5 } ], status: "A" },     { _id: 7, cust_id: "Madan Parmar", ord_date: new Date("2021-11-20"), price: 25, items: [ { sku: "oranges", qty: 10, price: 2.5 } ], status: "A" },     { _id: 8, cust_id: "Abhresh", ord_date: new Date("2021-11-20"), price: 75, items: [ { sku: "chocolates", qty: 5, price: 10 }, { sku: "apples", qty: 10, price: 2.5 } ], status: "A" },     { _id: 9, cust_id: "Abhresh", ord_date: new Date("2021-11-20"), price: 55, items: [ { sku: "carrots", qty: 5, price: 1.0 }, { sku: "apples", qty: 10, price: 2.5 }, { sku: "oranges", qty: 10, price: 2.5 } ], status: "A" },     { _id: 10, cust_id: "Abhresh", ord_date: new Date("2021-11-23"), price: 25, items: [ { sku: "oranges", qty: 10, price: 2.5 } ], status: "A" }  ]) Apply a map-reduce operation to the orders collection to group them by cust_id, then add the prices for each cust_id: To process each input document, define the map function: this refers the document that the map-reduce operation is processing in the function. For each document, the function maps the price to the cust_id and outputs the cust_id and price. var mapFunction1 = function() {emit(this.cust_id, this.price);}; With the two arguments keyCustId and valuesPrices, define the corresponding reduce function: The elements of the valuesPrices array are the price values emitted by the map function, grouped by keyCustId. The valuesPrice array is reduced to the sum of its elements by this function. var reduceFunction1 = function(keyCustId, valuesPrices) {return Array.sum(valuesPrices);};Apply the mapFunction1 map function and the reduceFunction1 reduce function to all documents in the orders collection: db.orders.mapReduce(mapFunction1,reduceFunction1,{ out: "map_reduce_example" }) The results of this operation are saved in the map_reduce_example collection. If the map_reduce_example collection already exists, the operation will overwrite its contents with the map-reduce operation's results. Check the map_reduce_example collection to verify: db.map_reduce_example.find().sort( { _id: 1 } ) Aggregation Alternative:You can rewrite the map-reduce operation without defining custom functions by using the available aggregation pipeline operators: db.orders.aggregate([{$group: { _id:"$cust_id",value:{$sum: "$price" } } },{ $out: "agg_alternative_1" }]) Check the agg_alternative_1 collection to verify: db.agg_alternative_1.find().sort( { _id: 1 } )Implementing Map Reduce with Java Consider the collection car and insert the following documents in it. db.car.insert( [ {car_id:"c1",name:"Audi",color:"Black",cno:"H110",mfdcountry:"Germany",speed:72,price:11.25}, {car_id:"c2",name:"Polo",color:"White",cno:"H111",mfdcountry:"Japan",speed:65,price:8.5}, {car_id:"c3",name:"Alto",color:"Silver",cno:"H112",mfdcountry:"India",speed:53,price:4.5}, {car_id:"c4",name:"Santro",color:"Grey",cno:"H113",mfdcountry:"Sweden",speed:89,price:3.5} , {car_id:"c5",name:"Zen",color:"Blue",cno:"H114",mfdcountry:"Denmark",speed:94,price:6.5} ] ) You will get an output like this:  Let's now write the map reduce function on a collection of cars, grouping them by speed and classifying them as overspeed cars.  var speedmap = function (){  var criteria;  if ( this.speed > 70 ) {criteria = 'overspeed';emit(criteria,this.speed);}}; Based on the speed, this function classifies the vehicle as an overspeed vehicle. The term "this" refers to the current document that requires map reduction. var avgspeed_reducemap = function(key, speed) {       var total =0;       for (var i = 0; i 
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Implementing MongoDb Map Reduce using Aggregation

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