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JS Tutorial

JS HOME JS Introduction JS Where To JS Output JS Statements JS Syntax JS Comments JS Variables JS Let JS Const JS Operators JS Arithmetic JS Assignment JS Data Types JS Functions JS Objects JS Events JS Strings JS String Methods JS String Search JS String Templates JS Numbers JS Number Methods JS Arrays JS Array Methods JS Array Sort JS Array Iteration JS Array Const JS Dates JS Date Formats JS Date Get Methods JS Date Set Methods JS Math JS Random JS Booleans JS Comparisons JS If Else JS Switch JS Loop For JS Loop For In JS Loop For Of JS Loop While JS Break JS Iterables JS Sets JS Maps JS Typeof JS Type Conversion JS Bitwise JS RegExp JS Errors JS Scope JS Hoisting JS Strict Mode JS this Keyword JS Arrow Function JS Classes JS Modules JS JSON JS Debugging JS Style Guide JS Best Practices JS Mistakes JS Performance JS Reserved Words

JS Versions

JS Versions JS 2009 (ES5) JS 2015 (ES6) JS 2016 JS 2017 JS 2018 JS 2019 JS IE / Edge JS History

JS Objects

Object Definitions Object Properties Object Methods Object Display Object Accessors Object Constructors Object Prototypes Object Iterables Object Sets Object Maps Object Reference

JS Functions

Function Definitions Function Parameters Function Invocation Function Call Function Apply Function Bind Function Closures

JS Classes

Class Intro Class Inheritance Class Static

JS Async

JS Callbacks JS Asynchronous JS Promises JS Async/Await


DOM Intro DOM Methods DOM Document DOM Elements DOM HTML DOM Forms DOM CSS DOM Animations DOM Events DOM Event Listener DOM Navigation DOM Nodes DOM Collections DOM Node Lists

JS Browser BOM

JS Window JS Screen JS Location JS History JS Navigator JS Popup Alert JS Timing JS Cookies


Web API Intro Web Forms API Web History API Web Storage API Web Worker API Web Fetch API Web Geolocation API


AJAX Intro AJAX XMLHttp AJAX Request AJAX Response AJAX XML File AJAX PHP AJAX ASP AJAX Database AJAX Applications AJAX Examples



JS vs jQuery

jQuery Selectors jQuery HTML jQuery CSS jQuery DOM

JS Graphics

JS Graphics JS Canvas JS Plotly JS Chart.js JS Google Chart JS D3.js

JS Examples

JS Examples JS HTML DOM JS HTML Input JS HTML Objects JS HTML Events JS Browser JS Editor JS Exercises JS Quiz JS Certificate

JS References

JavaScript Objects HTML DOM Objects

JavaScript Examples

What can JavaScript do?

Examples Explained

Where to Insert JavaScript

Where to Explained

JavaScript Output

Output Explained

JavaScript Syntax

Syntax Explained

JavaScript Statements

Statements Explained

JavaScript Comments

Comments Explained

JavaScript Variables

Variables Explained

JavaScript Arithmetic

Arithmetic Explained

JavaScript Assignment

Assignment Explained

JavaScript String Concatenation

Concatenation Explained

JavaScript Data Types

Data types Explained

JavaScript Objects

Objects Explained

JavaScript Functions

Functions Explained

JavaScript Events

Events Explained

JavaScript Strings

Strings Explained

JavaScript Numbers

Numbers can be written with or without decimals Extra large or extra small numbers can be written with exponent notation Number are considered accurate only up to 15 digits Floating point arithmetic is not always 100% accurate But it helps to multiply and divide by 10 Adding two numbers results in a new number Adding two numeric strings results in a concatenated string Adding a number and a numeric string also results in a concatenated string Adding a numeric string and a number also results in a concatenated string Common mistake when adding strings and numbers 1 Common mistake when adding strings and numbers 2 JavaScript will try to convert strings to numbers when dividing JavaScript will try to convert strings to numbers when multiplying JavaScript will try to convert strings to numbers when subtracting JavaScript will NOT convert strings to numbers when adding A number divided by a string is NaN (Not a Number) A number divided by a numeric string is a number The global JavaScript function isNaN() returns if a value is a number Using NaN in a mathematical operation will always return NaN Using NaN in a mathematical string operation will concatenate NaN NaN (Not a Number) is a number (Yes! typeof NaN returns number) Infinity is returned if you calculate a number outside the largest possible number Division by zero also generates Infinity Infinity is a number (typeof Infinity returns number) Constants, preceded by 0x, are interpreted as hexadecimal The toString() method can output numbers as hex, octal, and binary Numbers can be objects Numbers and objects cannot be safely compared Objects and objects cannot be safely compared

Numbers Explained

JavaScript Number Methods

Numbers Methods Explained

JavaScript Maths

Maths Explained

JavaScript Random

Random Explained

JavaScript Dates

Dates Explained

JavaScript Arrays

Arrays Explained

JavaScript Array Methods

Array Methods Explained

JavaScript Array Sort

Array Sort Explained

JavaScript Array Iteration

Array Iteration Explained

JavaScript Type Conversion

Type Conversion Explained

JavaScript Booleans

Booleans Explained

JavaScript Comparisons

Comparisons Explained

JavaScript Conditionals

Conditionals Explained

JavaScript Loops

Loops Explained

JavaScript Error Handling

Errors Explained

JavaScript Regular Expressions

JavaScript Objects

Objects Explained

JavaScript Object Properties

Object Properties Explained

JSON Objects

JSON Object Properties Explained

JSON Arrays

JSON Arrays Explained

JSON Parse

JSON Parse Explained

JSON Stringify

JSON Stringify Explained


JSON PHP Explained


JSON HTML Explained


JSON JSONP Explained