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JavaScript Tutorial

JavaScript Introduction JavaScript Example External JavaScript

JavaScript Basics

JS Comment JS Variable JS Global Variable JS Data Types JS Operators JS If Statement JS Switch JS Loop JS Function

JavaScript Objects

JS Object JS Array JS String JS Date JS Math JS Number JS Boolean

JavaScript BOM

Browser Objects 1) Window Object 2) History Object 3) Navigator Object 4) Screen Object

JavaScript DOM

5) Document Object getElementById GetElementsByClassName() getElementsByName getElementsByTagName JS innerHTML property JS innerText property

JavaScript Validation

JS form validation JS email validation

JavaScript OOPs

JS Class JS Object JS Prototype JS constructor Method JS static Method JS Encapsulation JS Inheritance JS Polymorphism JS Abstraction

JavaScript Cookies

JS Cookies Cookie Attributes Cookie with multiple Name Deleting Cookies

JavaScript Events

JavaScript Events JavaScript addEventListener() JS onclick event JS dblclick event JS onload event JS onresize event

Exception Handling

JS Exception Handling JavaScript try-catch

JavaScript Misc

JS this Keyword JS Debugging JS Hoisting JS Strict Mode JavaScript Promise JS Compare dates JavaScript array.length JavaScript alert() JavaScript eval() function JavaScript closest() JavaScript continue statement JS getAttribute() method JS hide elements JavaScript prompt() removeAttribute() method JavaScript reset JavaScript return JS String split() JS typeof operator JS ternary operator JS reload() method JS setAttribute() method JS setInterval() method JS setTimeout() method JS string includes() method Calculate current week number in JavaScript Calculate days between two dates in JavaScript JavaScript String trim() JavaScript timer Remove elements from array JavaScript localStorage JavaScript offsetHeight Confirm password validation Static vs Const How to Convert Comma Separated String into an Array in JavaScript Calculate age using JavaScript JavaScript label statement JavaScript String with quotes How to create dropdown list using JavaScript How to disable radio button using JavaScript Check if the value exists in Array in Javascript Javascript Setinterval JavaScript Debouncing JavaScript print() method JavaScript editable table CanvasJS

JavaScript Advance

JS TypedArray JS Set JS Map JS WeakSet JS WeakMap JavaScript callback JavaScript closures JavaScript date difference JavaScript date format JS date parse() method JavaScript defer JavaScript redirect JavaScript scope JavaScript scroll JavaScript sleep JavaScript void JavaScript Form

Differences

jQuery vs JavaScript JavaScript vs PHP Dart vs. JavaScript JavaScript Vs. Angular Js JavaScript vs. Node.js

Questions

Lodash

Lodash _.find() Method Lodash_.get() Method

MCQ

JavaScript MCQ

Interview Questions

JavaScript I/Q

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JavaScript Hoisting

Hoisting is a mechanism in JavaScript that moves the declaration of variables and functions at the top. So, in JavaScript we can use variables and functions before declaring them.

JavaScript hoisting is applicable only for declaration not initialization. It is required to initialize the variables and functions before using their values.

JavaScript Hoisting Example

Here, we will use the variable and function before declaring them.

JavaScript Variable Hoisting

Let's see the simple example of variable hoisting.

<script>
x=10;
document.write(x);
var x;
</script>

JavaScript Function Hoisting

Let's see the simple example of variable hoisting.

<script>
document.write(sum(10,20));
function sum(a,b)
{
return a+b;
}
</script>

Next TopicJavaScript Strict Mode

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