Introduction to JavaScript
JavaScript is a simple, easy-to-learn, quick and powerful programming language, which can be used in all kinds of websites. It provides a lot of opportunities for you to create more interactive websites than merely static html pages.
JavaScript is a server-side programming language. As such, it runs on the client side of your browser and allows you to read and write to any web page. It’s also used in setting up and controlling animations, so that web pages appear more engaging by adding movement and interactivity.
JavaScript helps us to generate dynamic web pages and also helps us to add interactivity to web pages. This programming language has always been popular among web developers. JavaScript can be accessed by clients such as Google Chrome and Mozilla Firefox as well as mobile devices like Android, iOS and BlackBerry.
JavaScript is a programming language that has gained great popularity over the past few years. It was initially developed in 1995, and it has become a favourite language of all front-end developers. According to the Langa Index, JavaScript has become the most popular of all languages used in sites and apps worldwide.
How to Add JavaScript to your HTML File
You can add JavaScript to your html file in three ways:
- Inline Code:- We usually use this method when we have to call a function in the HTML event attribute.
- Embedding Code:- You can embed JS code in your html file by using the
<script>tag. - External File:- You can also create separate file to write JS code and save it with an extension of (.js) and later add that file in your html document.
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JavaScript Syntax
JavaScript is a very simple language with three main types of statements: declarations, expressions and statements.
Declarations: A declaration is a statement that creates something in your program. These are always at the top of your script file. They include variables, functions and classes.
Expressions: An expression is an operation you perform on data in your program to get new data back out of your program. Expressions can be mathematical operations like addition or division, or they can be something more complex like a function call (which takes input values as arguments, does some processing on them and then returns new output values).
Statements: A statement is the smallest unit of execution in JavaScript code; it cannot be broken down further into smaller parts. Statements have a complete block of code around them that will be executed when they reach the end of their block.
