Everything you need to know to get started with JavaScript

If you are interested in web development, JavaScript is a language you must learn.

JavaScript was developed in May 1995 by Brendon Ich, who worked for Netscape Communications Corporation. The idea of ​​JavaScript came from the need to make web pages more dynamic. Eich made it in just 10 days. JavaScript was originally named Mocha by Netscape founder Mark Andreessen. The name was changed to LiveScript before finally receiving a trademark license from Sun called JavaScript. Although they did not want people to think that the language was influenced by Java, they wanted to retain the promotion and publicity that Java received in the early 1990’s.

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Brendon Ich

Environmentally, JavaScript is probably the easiest language to run. Anyone with a computer or smart phone is fully equipped to run JavaScript programs or even create their own. The only requirements are a browser and a text editor. There is no complex developmental environment to install. No IDE to be known. Because JavaScript is easy to use and run, many developers consider it a toy or a weak language. However, it is probably one of the most developed languages ​​to date. Many highly advanced projects have been created using JavaScript from office suites like Zoho.com to social integration tools like Facebook’s JavaScript SDK.

The most popular language

Each programmer will have a Github account for its salt value. So one can say a lot by the number of Github projects based on current technology. JavaScript projects have shown a steady trend every time since Github was created in 2008.
Ironically, Ruby, the language in which Github was written, has steadily declined. It should be noted that NodeJS, a JavaScript framework (more on this later) is a major contributor to the growth of JavaScript projects.

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RedMonk’s popularity rating for programming languages ​​lists JavaScript right there

The most impressive feature

Just in Time (JIT) compilation
Just in Time (JIT) is a compilation made while performing. The JIT compilation is also called dynamic translation. This allows high speeds to be implemented. In modern browsers JavaScript is compiled, optimized and implemented at runtime. Performance is so good that it is comparable to software written in C or C ++.

Object Oriented Programming
JavaScript uses all object oriented programming concepts such as encapsulation, inheritance, polymorphism, etc., as well as adds. In fact some OOP concepts can be better implemented using JavaScript features called ‘Lambda’ and ‘Module’.

Syntax
JavaScript shares some syntax with Java, although its own syntax is simpler, shorter and more flexible. It has adapted to become the dominant standard of client-server communication using JSON. JSON has since replaced XML because it is more compact and flexible.

Asynchronousness
Everything edited in the browser happens in a single loop so JavaScript code is highly dependent on event handlers and AJAX calls. Whatever the background processing it allows for a smooth and responsive UI.

Recyclable
If the code is not reusable a language will not be able to learn. Especially for web where legitimacy is often required JavaScript lets you write code that can be run on both server side and client side.

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JavaScript wins another milestone in another popularity contest, and then some

Advantages of JavaScript over others

Built-in interpreter
All browsers have built-in JavaScript interpreters. No other language has this feature and it is unlikely that it will change anytime soon.

Easy debugging
All browsers allow you to easily debug your code. If you are dissatisfied with this you can use a plugin or tool to help debug. These plugins are free and small in size. Examples are Firebug for Firefox and Web Developer Toolbar for Chrome.

Functions as objects
Can be used as function object and variable. This is a very useful tool in terms of reusability. You can literally mold old code.

Ready resources available
JavaScript developers keep the privacy of a large collection of free and powerful frameworks and libraries.

Very fast Execution engine
There are currently three very fast JavaScript engines, each competing with the other for better. These are FireFox’s SpiderMonkey, Google V8 and Safari JavaScriptCore.

Both client side and server side
JavaScript was originally created as a purely client-side language but gradually became a server-side implementation. NodeJS is such an example.

Hello World in JavaScript

All JavaScript is written in HTML code and two tags Bound in

<script>

….your code

</script>

So let’s go ahead and see what our standard snippet code says Hello World looks like in JavaScript.

<html>

<body>

<script>

alert(“Hello World!”);

</script>

</body>

</html>

This bit of code, when executed, will output “Hello World!” In the form of a warning box on your screen.
Alternatively you can print directly to the webpage using the document.write () statement.









Using the JavaScript Framework and Libraries

Developing large software can be difficult and time consuming. To overcome this, developers resort to frameworks and libraries. A framework is basically a tried and tested design / configuration of your software components. The most popular JavaScript frameworks are AngularJS, Backbone.js and Bootstrap.
A library is a set of predefined functions grouped together that are reused in many of the most efficient ways possible. The most popular libraries are jQuery, Prototype and Dojo. Libraries allow you to process and display PDF files, from creating and displaying graphs.

Interesting tool

Grant
Grant is a JavaScript task runner used to automate repetitive tasks such as minification, unit testing, linting, etc. Configure a grantfile and Task Runner does everything else. Twitter and Adobe actively use Grunt.

Mocha
Mocha is a testing framework for JavaScript that lets you test both synchronous or asynchronous. It is hosted on Github.

Mongodib
This is a document based NoSQL database. It offers quick search and update, flexible integration and data processing. It is easy to scale and uses internal memory to store current data which enables quick access.

If not
Sinon is a JavaScript library that provides spyware, stubs, and jokes for JavaScript. A spy is a function that records the matrix passed into it. A stub is a spy that has some pre-programmed functionality. It can perform actions based on the metrics passed.
The four tools mentioned above are only available on JavaScript for a large number of readymade tools. There’s probably a tool for almost every need, and if you don’t have one, it’s easy to write your own, but remember to make it free for others to use.

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JavaScript Learning Tool

W3Schools for HTML and CSS
You must have some basic knowledge of HTML and CSS to learn JavaScript. For this, w3schools provides some good step-by-step tutorials for bare basics. It should only be used as a quick reference tool although as a learning tool it does not measure up perfectly.

Mozilla Developer Network
Mozilla Developer Network is also a good place to start. It has always updated content, is well maintained and contains thousands of documents on various topics like HTML5, Nodes, JavaScript etc.

Code Academy
CodeAcademy has some free tutorials and you don’t need to sign up to use them. Although they are slow, so if you are an experienced coder you will not like them.

Douglas Crackford
For the little experienced, Douglas Crackford from Yahoo! There are some good tutorials that you can download and watch. He gets straight to the point, and focuses on how things can be done without going into the details. Or buy his book, JavaScript: The Good Parts.

Tools for the JavaScript Framework

AngularJS
AngularJS offers a powerful framework for creating great apps, but has a steep learning curve. It is often described as a hockey stick – initially very easy and then increasingly difficult. If you master it, AngularJS will help you build the most powerful, large-scale applications. Here and here

Backbone.js
Backbone.js is very useful for creating single page applications (SPAs). It is a small library, but gives you a lot of functionality. Look at this.

Bootstrap
Bootstrap is a framework for developing mobile-first, responsive projects on the web Check it out here and here

JS Fidel
JSFiddle provides a custom environment for testing your JavaScript, HTML and CSS in your browser. It has been described as an online playground for JavaScript. Users can select individual JS versions, libraries and frameworks with which they want to test their code. This is a must use tool.

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