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JavaScript - Introduction

What is JavaScript?

JavaScript, often abbreviated as JS, is a programming language which all web developers need to learn for developing website. JavaScript is used along with HTML/CSS.

JavaScript conforms to the ECMAScript specification. ECMAScript is a JavaScript standard to ensure the interoperability of web pages across different browsers. The list of ECMA standards can be found at https://www.ecma-international.org/publications-and-standards/standards/ecma-262/

Where is JavaScript used?

JavaScript is used in browser with JavaScript engine, which uses just-in-time compilation. Each browser software have their own JavaScript engine.

• Chrome - V8 engine
• Edge - Chakra engine
• Firefox - SpiderMonkey engine
• Safari - JavaScriptCore engine

JavaScript is also used in Node.js, which uses V8 engine.

<script type="text/javascript">
    alert("Hello World, LearnCodeNow!");
</script>

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