JavaScript Versions Basics
JavaScript Versions Basics #devtools99 #javascript #js #javascripttutorial #coding #programming
JavaScript Versions Basics
JavaScript
JavaScript is a synchronous, single-threaded scripting language used for dynamic functionality on web pages. It can manipulate data, validate input, and is utilized for both client and server-side development.
Uses
Adding interactivity to websites
Developing mobile applications
Creating web browser-based games
Back-end web development
ECMAScript
ECMAScript (ES) is a JavaScript standard aimed at ensuring web page compatibility across different browsers. It is primarily used for client-side scripting and server-side applications using Node.js. ECMAScript releases new versions nearly every year. ES5 was the first significant revision, and ES6 is the most well-known version.
ECMAScript Versions
ES1: ECMAScript 1 - First edition
ES2: ECMAScript 2 - Editorial revisions to ES1
ES3: ECMAScript 3 - Introduced regular expressions, try/catch, switch, and do-while
ES4: ECMAScript 4 - Never released
ES5: ECMAScript 5 - Added strict mode, JSON support, String.trim(), Array.isArray(), iteration methods, and trailing commas
ES6 (ECMAScript 2015)
Features:
let and const
Default parameter values
Array.find(), Array.findIndex()
Exponential operator (**)
Array.includes()
String padding
Object.entries(), Object.values()
Async functions
Shared memory
Rest/spread properties
Asynchronous iteration
Promise.finally()
Additions to RegExp
JavaScript vs ECMAScript
ECMAScript is a standardized specification, while JavaScript is an implementation of this standard.
caniuse.com
This site lets you check the browser compatibility of various ECMAScript features.
TypeScript
TypeScript is a superset of JavaScript that introduces static types and prevents many type-related errors. It enhances JavaScript and offers better tooling like IntelliSense.
Features
Lightweight and easy-to-learn
Adds enhanced features to JavaScript ES6
Supports classes and objects
TypeScript vs ES6
ES6: Sixth edition of ECMAScript; focused on client-side scripting
TypeScript: A free, open-source object-oriented programming language
ES6: Limited data type support
TypeScript: Supports all primitive data types
ES6: Uses modules with import/export
TypeScript: Has internal and external modules
ES6: Global and local scope
TypeScript: Global, class, and local scopes
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