10 Most Popular JavaScript Frameworks 2020 For Developers

10 Most Popular JavaScript Frameworks 2020 For Developers

</p><h1 class="ql-align-justify"><br></h1><h1 class="ql-align-justify"><strong style="color: rgb(153, 51, 0);">MOST POPULAR JAVASCRIPT FRAMEWORKS 2019</strong></h1><p>

JavaScript Frameworks is an application framework which is written in javascript. It is a collection of JavaScript code libraries. JavaScript Framework is used to design application. It is very difficult to choose a framework among the most popular JavaScript framework for any project. So it is very important to know that the top javascript framework and features of that particular JavaScript Framework. In this article, we show Top 10 JavaScript frameworks with features and their pros and cons.


  • Angular JS is an open source framework built over JavaScript. It was built by the developers at Google. This framework was used to overcome the obstacles encountered while working with Single Page applications.

  • AngularJS was born in 2009 as a component of a more immensely colossal commercial product, called GetAngular.

  • Large organizations like PayPal, Freelancer, LinkedIn, Lego, Hopscotch and several others are powering their UIs by AngularJS.

  • Angular makes it easier to work with dynamic rendering with its JSON based processing and rendering capabilities.

  • Angular has been developed with the vision of making it modular, testable and maintainable.
    The latest version of Angular JS is 1.7.8


  • Dependency Injection – js has built-in dependency injection (DI) that helps natural development, understanding, and testing.

  • Data-binding – The two-way data-binding feature saves developers from writing a lot of code. It is the automatic synchronization of data between model and view components.

  • It can be configured in MVC as well as MVW architecture.

  • Services − are a set of code that can be shared by different components of an application.

  • Directives – With this feature, it becomes easy to create custom HTML tags that act like new custom widgets. It can also be used to manipulate DOM attributes.


  • Two-way data binding -AngularJS facilitates faster and easier data binding which doesn’t require a developer to intervene at all.

  • DOM manipulation -the developer saves time and efforts to code, translate and update the DOM elements.

  • Improved server performance -it only serves static files and responds to the API calls.

  • Responsive web – AngularJS makes it possible by letting responsive, fast-loading and seamlessly -navigating websites and apps.

  • Use of directives -AngularJS makes use of directives that keep the scripts and HTML pages mess-free and extremely organized.


  • Difficult learning – you may have to face great difficulty in getting adapted to the framework.

  • The scopes -Quite layered and arranged hierarchically, scopes can be complex entities to handle if it is your first experience with Angular.

  • Inexperience with MVC -If you are completely unfamiliar with the Model-View-Controller architectural patterns, using Angular can be extremely time-consuming.

Blog: Angular Blog

Getting Started: Angular JS


  • Node.js is an open source, a cross-platform runtime environment for executing JavaScript code outside of a browser.

  • It is used for building back-end services or APIs and developing server-side and networking applications.

  • It is a platform which is built on Google Chrome’s JavaScript Engine (V8 Engine).

  • Node.js was originally written by Ryan Dahl in 2009.

  • Node.js is developed by Joyent Inc.

  • The latest version of Node.js is 12.2.0.

  • It is used by companies like Uber, PayPal, and Walmart which is a mirror to its global acceptance as a back-end language.

  • The applications built on Node, are written in JavaScript which can be run within the Node.js runtime on OS like Microsoft Windows, Linux as well as MacOS.


  • The applications in Node never buffer any data. This is because the applications output the data in chunks.

  • Node uses single-threaded models which consist of event looping. This event mechanism helps servers to respond in an asynchronous way that makes the servers highly scalable.

  • Same code for client-side and server-side

  • Node technology helps in streaming data from different sources and can be used to proxy some servers.

  • The APIs of the Node’s library is asynchronous which means that the server doesn’t wait for an API to return data; thus rendering the data asynchronously giving a faster response to every request.


  • Share the same piece of code with both server and client side.

  • better efficiency and overall developer productivity

  • it also serves as a marketplace for open source JavaScript tools, which plays an important role in the advance of this technology.


  • Dealing with the relational database is a pain if you are using Node.

  • Node.js is a single-threaded environment, which is often considered a serious drawback of the technology

  • Without diving in depth of JavaScript, if someone starts Node, he may face a conceptual problem.

Getting Started: Node.js 12.2.0


  • React is an open-source JavaScript most popular framework which is used by Facebook, Instagram and much more.

  • React is maintained by Facebook, Instagram and a community of individual developers and corporations, and aims to address the challenges encountered in developing single-page applications.

  • React was created by Jordan Walke, a software engineer at Facebook.

  • Latest React version is 16.8.4

  • React is mainly used for the V (view) in the MVC model since the UI can be updated without having to reach out to the server and fetch a new view.


  • Components – React is declarative and component based. The web pages are divided into small components to create UIs.

  • Data binding – One-way data binding along with an application infrastructure called Flux controls. Flux is a pattern that keeps data unidirectional.

  • Maintaining React is easy and straightforward due to its component-based architecture and reusability of the defined components.

  • React can be used on the server-side as well as on client-side.

  • You can use React with other frameworks.

  • Maintaining React is easy and straightforward due to its component-based architecture.

  • JSX – JSX is a javascript extension which indicates that the script needs to be processed and converted to actual javascript.


  • React is the ability to reuse code components of a different level anytime, another meaningful time-saving effect.

  • Virtual DOM in ReactJS makes the user experience better and the developer’s work faster.

  • Stable code – ReactJS allows for direct work with components and uses downward data binding to ensure that changes in child structures don’t affect their parents.

  • An open-source Facebook library – constantly developing and open to the community.


  • JSX as a barrier – Developers and designers complain about JSX’s complexity and consequent steep learning curve.

  • Poor documentation – developers struggle with integrating tools with ReactJS.

Blog: React Js Blog

Getting Started React Js


  • Vue.js is a lightweight progressive JS framework which gets a lot of its concepts from ReactJS and AngularJS.

  • Vue.js is a JavaScript front-end framework that was built to organize and simplify web development.

  • Vue was created by Evan You.

  • It is easy to integrate into other applications and languages. For example, Vue.js bundles with Laravel and couples nicely with it to create frontends for Laravel applications.

  • Vue uses an HTML-based templating syntax, allowing developers to write components quickly and easily.

  • Vue has an incredibly small file size, making it easy to include in projects without creating a slowdown.

  • The latest version of Vue.js is 2.6.8


  • Easy to understand and develop

  • Transitions – Vue allows the application of transition effects when items are inserted, removed or updated from the DOM.

  • Reactivity – Vue has a robust reactivity system.

  • It consists of a clear separation between the components and directives.

  • Vue proves to be more flexible and modular front-end development framework.


  • Flexibility -This flexibility makes it easy to switch to Vue because developers who have experience with React, Angular and JS framework would find Vue’s design very familiar.

  • Small Size – it should be noted that the Vue.js ecosystem is also small and fast.

  • The advantage with Vue.js is that it enables the development of large-scale templates.

  • Vue.js useful both for building entire single page applications and for contributing components into existing apps.

  • For a beginner to write their first application, they just have to know some basic Javascript and HTML.


  • Sometimes flexibility can cause some issues for the developers.

  • Language Barrier – A Majority of the users are non-English speaking communities which are perhaps one of the biggest issues with this framework.

  • Vue doesn’t yet have the widespread support of its fellow frameworks as it is not as popular as other frameworks like Angular.js.

Getting Started: Vue.js


  • Ember.js is an open-source client-side JavaScript web application framework predicated on the model-view-controller (MVC) software architectural pattern.

  • Ember’s roots go way back to 2007. Starting its life as the SproutCore MVC framework, pristinely developed by SproutIt and later by Apple, it was forked in 2011 by Yehuda Katz, a core contributor to the popular jQuery and Ruby on Rails projects.

  • It’s used for TinderBox, Netflix, Apple Music, Yahoo!, LinkedIn, PlayStation Now, and Vine.

  • A complete development stack can be formed by using Ember and other important tools.

  • Handlebars layout and Ember’s backend architecture allows writing developers own application-specific HTML tag.

  • Ember has been a highly opinionated framework which was built to be very flexible.

  • The Ember Inspector allows for easy inspection of Ember objects in your browser’s developer tools. This can be used both while developing and while debugging issues.

  • The latest version of Ember is 3.8.0


  • Excellent data library.

  • Ember’sCLI provides standard application structure.

  • Ember works on the Model-view-view model (MVVM) pattern.

  • Inspector tool is useful for debugging applications.


  • High performance

  • Faster development due to Ember CLI

  • Understandable documentation

  • Two-way data binding

  • Well-organized

  • Own debugging tool (Ember Inspector).


  • Smaller community and the extensive amount of outdated tutorials on the web

  • Due to a helper function, two-way data binding is more complex.

  • Too big for small projects

  • Complications with processing quick changes

  • Difficult to learn
    Blog: Ember.js

Getting Started: Ember.js


  • Backbone.js is a lightweight MVC framework. Born in 2010, it expeditiously grew popular as a lean alternative to cumbersomely hefty, full-featured MVC frameworks such as ExtJS.

  • Backbone.js is developed by Jeremy Ashkenas.

  • This resulted in many accommodations adopting it, including Pinterest, Sony Entertainment Network, Flixster, Airbnb, SoundCloud, and others.

  • Backbone.js gives structure to web applications by providing models with key-value binding and custom events, accumulations with an affluent API of enumerable functions, views with declarative event handling, and connects it all to your subsisting API over a RESTful JSON interface.

  • The latest version is 1.4.0.


  • RESTful JSON interface – Backbone is a framework/ library that has a RESTful JSON interface, based on the Model-view-presenter (MVP) application model.

  • Event-driven communication between views and models prevents the code from being hard to read.

  • Models in Backbone.js can be tied to a back-end since Backbone provides excellent support for RESTful APIs.

  • In case of any changes in a model, the HTML code is automatically updated.

  • It is a simple library that separates UI and business logic.


  • Backbone gives you a lot more control over performance, particularly in mobile scenarios.

  • Easy, fast and lightweight framework so very easy to understand the documentation and codes.


  • The biggest drawback of Backbone is that, instead of providing structure, it provides some basic tools to create structure. So, somewhere you have to depend on developers to decide how to structure the application.

  • To update the view whenever your model changes, and to update the model whenever your view changes, you have to write a lot of boilerplate, because of lack of support for two-way data binding.

Getting Started: Backbone.js


  • Polymer.js is the open-source JavaScript library for building web applications using Web components.

  • It was the very first library to allow interactive building applications by composing components.

  • Polymer.js is built to leverage the features that are present in the web platform to let developers build components.

  • Polymer.js is being used by YouTube, Google Play Music and Netflix, to name a few.

  • Polymer.js is considered to be one of the best to work with Spring Boot REST resources when compared to other JS frameworks.

  • Version 3.0 of the Polymer library brings web components into the mainstream, embracing JavaScript modules and npm.

  • The latest version is 3.2.0.


  • Speed – It is three times faster in Chrome and four times faster on Safari.

  • Polymer.js is built on top of the web standards API which allows building custom HTML elements

  • Both one-way and two-way data binding is possible with this library.

  • The web component standards are helpful in the creation of usable widgets in web documentation and application.

  • Polymer elements consist of designs and themes which mean prevents developers from modifying complex web page source code to match the designer’s need.


  • Quick -The Polymer is a new library which is three times faster on Chrome, four times faster on Safari.

  • Developers use Polymer elements which include design and themes, which means there is no need to modify complex Web page source code to match designer specifications.

  • Polymer.js provides new functionality such as Shadow DOM which enables the encapsulation of CSS.


  • Dependency errors and pointing to a different version of dependencies.

  • Downloading of entire library and Polyfills.

  • Lack of server-side rendering.

Blog: Polymer.js Blog

Getting Started: Polymer 3.0


  • Meteor is a full-stack framework, which allows developers to learn one tool, and use it for almost everything in their application.

  • It also makes it an exciting proposition for new developers who are aiming at full-stack positions or projects, as they can get productive faster with Meteor.

  • Meteor uses a front-end JavaScript that runs on the browser and back-end on meteor server within Node.js.
    The latest version of Meteor is 1.8.

  • Meteor is developed by Meteor Development Group.

  • Companies like Mazda, Honeywell, and Qualcomm use Meteor.


  • Meteor provides a full-stack solution for developing and using web applications.

  • Highly scalable and beginner friendly.

  • Easy to set up and start creating projects.

  • It allows using the same code on the front-end as well as the back-end for mobile and web applications.

  • Integrated live reloading allows refreshing only the required DOM elements without reloading the entire page.


  • Simplicity – Coding is very simple and beginner friendly.

  • Official and community packages are a huge time saver.

  • Velocity is the name of the Meteor’s testing tool. In addition to its core functions, Velocity enables integration with Mocha or Jasmine syntax.


  • There is a lot of magic going on when working with Meteor, so developers might find themselves limited in some way.

  • Deployment and tool integration is not as simple as some other platforms.

  • Meteor isn’t very suitable for large and complex applications.

Blog: Meteor Blog

Getting Started: Meteor.js


  • Mithril is used for creating single-page applications on the client-side.

  • It supports all the browsers like IE9 without the requirement of any polyfills.

  • It is tiny, fast, provides routing and XHR utilities.

  • Mithril has in-built modules for XHR and routing while React needs third parties for the same along with a lot of memory usage.

  • Mithril is known to be pragmatic since it is straightforward to learn components, routing and XHR in less than 15 minutes to start building applications.

  • Mithril is currently being used by companies like Nike and Fitbit and other open source platforms like Liches.


  • It is Flux compatible, robust and un-opinionated

  • Mithril templates are just JavaScript so that developers can test them in any JavaScript engine without a build step.

  • In Mithril.js, components are created with an optional controller and a required view property.

  • Mithril gives hierarchical MVC components, URL routing, safe-by-default templates, customizable data binding.


  • Easy to learn

  • Mithril’s loading times are very fast. This is because it’s templates are compiled first and then served to the browser and because it uses a virtual DOM.

  • Mithril gives to the developer the flexibility to chose the best JavaScript library to use for a specific task.

  • Mithril’s API is pretty small compared to other frameworks.


  • Mithril isn’t recognized much, it often has a head to head competition with other JavaScript frameworks.

Getting Started: Mithril.js 1.1.6


  • Aurelia is called as the “next-gen UI framework” written in ECMAScript.

  • Aurelia is a collection of open source modern JavaScript modules.

  • Aurelia is a JavaScript client framework for the web, mobile, and desktop that leverages simple conventions to empower your creativity.

  • Aurelia is the only framework that lets you build components with plain, vanilla JavaScript/TypeScript. The framework stays out of your way so your code remains clean and easy to evolve over time.

-Aurelia provides a CLI for generating and building projects, a browser plugin for debugging and a VS Code plugin as well.


  • Routing and UI Composition – Helps in using an advanced client-side router with its pluggable pipeline, child routers, and asynchronous screen activation.

  • HTML Extensible

  • Aurelia integrates with Web Components with no external dependencies.

  • Aurelia supports ES5, ES2015, ES2016 and TypeScript.

  • Testable for ES2015 using DI container. Unit code testing is very simplified.


  • The framework itself is directed towards web standards so you will always stay up to date with modern concepts.

  • it is very agile, knowledgeable and willing to help within short notice.

  • It is directed towards the developers’ experience. It saves you lots of time.

  • You can add or remove any tools that the framework offers and you can also add any other tools that aren’t part of the framework.

  • It has a simple structure which makes the framework quicker and easier to learn.

  • It is easy and quick to configure and set it up for use.


  • There are no major limitations.

Blog: Aurelia.js

Getting Started: Aurelia.js.

Thanks for reading !

What is JavaScript – All You Need To Know About JavaScript

What is JavaScript – All You Need To Know About JavaScript

In this article on what is JavaScript, we will learn the basic concepts of JavaScript.

After decades of improvement, JavaScript has become one of the most popular programming languages of all time. It all started in the year 1995 when Brendan Eich created JavaScript in a span of 10 days. Since then, it has seen multiple versions, updates and has grown to the next level.

Here’s a list of topics that I’ll be covering in this blog:

  1. What is JavaScript
  2. What can JavaScript do?
  3. JavaScript Frameworks
  4. The Big Picture: HTML, CSS & JavaScript
  5. Benefits of JavaScript
  6. Fundamentals of JavaScript
    VariablesConstantsData TypesObjectsArraysFunctionsConditional statementsLoopsSwitch case
What is JavaScript?

JavaScript is a high level, interpreted, programming language used to make web pages more interactive.

Have you ever thought that your website is missing something? Maybe it’s not engaging enough or it’s not as creative as you want it to be. JavaScript is that missing piece which can be used to enhance web pages, applications, etc to provide a more user-friendly experience.

What is JavaScript?

JavaScript is the language of the web, it is used to make the web look alive by adding motion to it. To be more precise, it’s a programming language that let’s you implement complex and beautiful things/design on web pages. When you notice a web page doing more than just sit there and gawk at you, you can bet that the web page is using JavaScript.

Feature of JavaScript

Scripting language and not Java: In fact, JavaScript has nothing to do with Java. Then why is it called “Java” Script? When JavaScript was first released it was called Mocha, it was later renamed to LiveScript and then to JavaScript when Netscape (founded JavaScript) and Sun did a license agreement. Object-based scripting language which supports polymorphism, encapsulation and to some extent inheritance as well.**Interpreted language: **It doesn’t have to be compiled like Java and C which require a compiler.JavaScript runs in a browser: You can run it on Google Chrome, Internet Explorer, Safari, etc. JavaScript can execute not only in the browser but also on the server and any device which has a JavaScript Engine.

What is JavaScript – Stackoverflow stats

Currently, we have 100s of programming languages and every day new languages are being created. Among these are few powerful languages that bring about big changes in the market and JavaScript is one of them.

JavaScript has always been on the list of popular programming languages. According to StackOverflow, for the 6th year in a row, JavaScript has remained the most popular and commonly used programming language.

What can JavaScript do?

JavaScript is mainly known for creating beautiful web pages & applications. An example of this is Google Maps. If you want to explore a specific map, all you have to do is click and drag with the mouse. And what sort of language could do that? You guessed it! It’s JavaScript.JavaScript can also be used in smart watches. An example of this is the popular smartwatch maker called Pebble. Pebble has created Pebble.js which is a small JavaScript Framework that allows a developer to create an application for the Pebble line of watches in JavaScript.

What is JavaScript – Applications of JavaScript
Most popular websites like Google, Facebook, Netflix, Amazon, etc make use of JavaScript to build their websites.Among things like mobile applications, digital art, web servers and server applications, JavaScript is also used to make Games. A lot of developers are building small-scale games and apps using JavaScript.## JavaScript Frameworks

One major reason for the popularity of JavaScript is the JavaScript Frameworks. Here’s a brief introduction of the most trending JavaScript frameworks :

  1. AngularJS is Google’s web development framework which provides a set of modern development and design features for rapid application development.

  2. ReactJS is another top JavaScript framework mainly maintained by Facebook and it’s behind the User Interface of Facebook and Instagram, showing off its efficiency in maintaining such high traffic applications.

What is JavaScript – JavaScript Frameworks

  1. MeteorJS is mainly used for providing back-end development. Using JavaScript on the back-end to save time and build expertise is one of the major ideas behind Meteor.

  2. jQuery can be used when you want to extend your website and make it more interactive. Companies like Google, WordPress and IBM rely on jQuery.

The Big Picture: HTML, CSS & JavaScript

Anyone familiar with JavaScript knows that it has something to do with HTML and CSS. But what is the relationship between these three? Let me explain this with an analogy.

What is JavaScript – HTML, CSS and JavaScript

Think of HTML (HyperText Markup Language) as the skeleton of the web. It is used for displaying the web.

On the other hand, CSS is like our clothes. We put on fashionable clothes to look better. Similarly, the web is quite stylish as well. It uses CSS which stands for Cascading Style Sheets for styling purpose.

Then there is JavaScript which puts life into a web page. Just like how kids move around using the skateboard, the web also motions with the help of JavaScript.

Benefits of JavaScript

There has to be a reason why so many developers love working on JavaScript. Well, there are several benefits of using JavaScript for developing web applications, here’s a few benefits:

It’s easy to learn and simple to implement. It is a weak-type programming language unlike the strong-type programming languages like Java and C++, which have strict rules for coding.

It’s all about being fast in today’s world and since JavaScript is mainly a client-side programming language, it is very fast because any code can run immediately instead of having to contact the server and wait for an answer.

Rich set of frameworks like AngularJS, ReactJS are used to build web applications and perform different tasks.

**Builds interactive websites: **We all get attracted to beautifully designed websites and JavaScript is the reason behind such attractive websites and applications.

JavaScript is an interpreted language that does not require a compiler because the web interprets JavaScript. All you need is a browser like Google Chrome or Internet Explorer and you can do all sorts of stuff in the browser.

JavaScript is platform independent and it is supported by all major browsers like Internet Explorer, Google Chrome, Mozilla Firefox, Safari, etc.

JavaScript Fundamentals

In this What is JavaScript blog, we’ll cover the following basic fundamentals of JavaScript
VariablesConstantsData TypesObjectsArraysFunctionsConditional statementsLoopsSwitch case## Variables

Variable is a name given to a memory location which acts as a container for storing data temporarily. They are nothing but reserved memory locations to store values.

What is JavaScript – Variables

To declare a variable in JavaScript use the ‘let’ keyword. For example:

let age;

In the above example, I’ve declared a variable ‘age’ by using the ‘let’ keyword and then I’ve stored a value (22) in it. So here a memory location is assigned to the ‘age’ variable and it contains a value i.e. ’22’.


Constants are fixed values that don’t change during execution time.

To declare a constant in JavaScript use the ‘const’ keyword. For example:

const mybirthday;
mybirthday='3rd August'; 

Data types

You can assign different types of values to a variable such as a number or a string. In JavaScript, there are two categories of data types :

What is JavaScript – Data Types


An object is a standalone entity with properties and types and it is a lot like an object in real life. For example, consider a girl, whose name is Emily, age is 22 and eye-color is brown. In this example the object is the girl and her name, age and eye-color are her properties.

What is JavaScript – Objects example

Objects are variables too, but they contain many values, so instead of declaring different variables for each property, you can declare an object which stores all these properties.

To declare an object in JavaScript use the ‘let’ keyword and make sure to use curly brackets in such a way that all property-value pairs are defined within the curly brackets. For example:

let girl= {
name: 'Emily',
age: 22,
eyeColour: 'Brown'

In the above example, I’ve declared an object called ‘girl’ and it has 3 properties (name, age, eye colour) with values (Emily, 22, Brown).


An array is a data structure that contains a list of elements which store multiple values in a single variable.

For example, let’s consider a scenario where you went shopping to buy art supplies. The list of items you bought can be put into an array.

What is JavaScript – Arrays example

To declare an array in JavaScript use the ‘let’ keyword with square brackets and all the array elements must be enclosed within them. For example:

let shopping=[];

In the above example I’ve declared an array called ‘shopping’ and I’ve added four elements in it.

Also, array elements are numbered from zero. For example this is how you access the first array element:



A function is a block of organised, reusable code that is used to perform single, related action.

Let’s create a function that calculates the product of two numbers.

To declare a function in JavaScript use the ‘function’ keyword. For example:

function product(a, b) {
return a*b;

In the above example, I’ve declared a function called ‘product’ and I’ve passed 2 parameters to this function, ‘a’ and ‘b’ which are variables whose product is returned by this function. Now, in order to call a function and pass a value to these parameters you’ll have to follow the below syntax:


In the above code snippet I’m calling the product function with a set of values (8 & 2). These are values of the variables ‘a’ and ‘b’ and they’re called as arguments to the function.

Conditional statements – if

Conditional statement is a set of rules performed if a certain condition is met. The ‘if’ statement is used to execute a block of code, only if the condition specified holds true.

What is JavaScript – if flowchart

To declare an if statement in JavaScript use the ‘if’ keyword. The syntax is:

if(condition) {

Now let’s look at an example:

let numbers=[1,2,1,2,3,2,3,1];
if(numbers[0]==numbers[2]) {

In the above example I’ve defined an array of numbers and then I’ve defined an if block. Within this block is a condition and a statement. The condition is ‘(numbers[0]==numbers[2])’ and the statement is ‘console.log(‘Correct!’)’. If the condition is met, only then the statement will be executed.

Conditional statements- Else if

Else statement is used to execute a block of code if the same condition is false.

What is JavaScript – Else-if flowchart

The syntax is:

if(condition) {
statement a;
else (condition) {
statement b;

Now let’s look at an example:

let numbers=[1,2,1,2,3,2,3,1];
if(numbers[0]==numbers[4] {
else {
console.log("Wrong, please try again");

In the above example, I’ve defined an if block as well as an else block. So if the conditions within the if block holds false then the else block gets executed. Try this for yourself and see what you get!

**Loops **

Loops are used to repeat a specific block until some end condition is met. There are three categories of loops in JavaScript :

  1. while loop
  2. do while loop
  3. for loop
While loop

While the condition is true, the code within the loop is executed.

What is JavaScript – while loop flowchart

The syntax is:

while(condition) {
loop code;

Now let’s look at an example:

let i=0;
while(i < 5) {
console.log("The number is " +i);

In the above example, I’ve defined a while loop wherein I’ve set a condition. As long as the condition holds true, the while loop is executed. Try this for yourself and see what you get!

Do while loop

This loop will first execute the code, then check the condition and while the condition holds true, execute repeatedly.

What is JavaScript – Do while loop flowchart

Refer the syntax to better understand it:

do {
loop code;
} while(condition);

This loop executes the code block once before checking if the condition is true, then it will repeat the loop as long as the condition holds true.

Now let’s look at an example:

do {
console.log("The number is " +i);
while(i > 5);

The above code is similar to the while loop code except, the code block within the do loop is first executed and only then the condition within the while loop is checked. If the condition holds true then the do loop is executed again.

For loop

The for loop repeatedly executes the loop code while a given condition is TRUE. It tests the condition before executing the loop body.

What is JavaScript – for loop flowchart

The syntax is:

for(begin; condition; step) {
loop code;

In the above syntax:

  • begin statement is executed one time before the execution of the loop code
  • condition defines the condition for executing the loop code
  • step statement is executed every time after the code block has been executed

For example:

for (i=0;i<5;i++) {
console.log("The number is " +i);

In the above example, I’ve defined a for loop within which I’ve defined the begin, condition and step statements. The begin statement is that ‘i=0’. After executing the begin statement the code within the for loop is executed one time. Next, the condition is checked, if ‘i<5’ then, the code within the loop is executed. After this, the last step statement (i++) is executed. Try this and see what you get!

Switch Case

The switch statement is used to perform different actions based on different conditions.

What is JavaScript – Switch case flowchart

Let’s look at the syntax for switch case:

switch(expression) {
case 1:
code block 1
case 2:
code block 2
code block 3

How does it work?

  • Switch expression gets evaluated once
  • Value of the expression is compared with the values of each case
  • If there is a match, the associated block of code is executed

Let’s try this with an example:

let games='football';
switch(games) {
case "throwball":
console.log("I dislike throwball!");
case "football":
console.log("I love football!");
case "cricket":
console.log("I'm a huge cricket fan!");
console.log("I like other games");

In the above example the switch expression is ‘games’ and the value of games is ‘football’. The value of ‘games’ is compared with the value of each case. In this example it is compared to ‘throwball’, ‘cricket’ and ‘football’. The value of ‘games’ matches with the case ‘football’, therefore the code within the ‘football’ case is executed. Try this for yourself and see what you get!

With this, we come to the end of this blog. I hope you found this blog informative and I hope you have a basic understanding of JavaScript. In my next blog on JavaScript I’ll be covering in-depth concepts, so stay tuned.

Also, check out our video on JavaScript Fundamentals if you want to get started as soon as possible and don’t forget to leave a comment if you have any doubt and also, let us know whether you’d want us to create more content on JavaScript. We are listening!

Learn JavaScript in 60 Minutes | JavaScript Crash Course | JavaScript Tutorial |

This video on "JavaScript" will help you learn JavaScript basics and fundamental concepts in 60 minutes. This will provide you in-depth knowledge about the JavaScript fundamentals that will help you write your own code in JavaScript and build a website. This JavaScript tutorial covers following topics..


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