HOISTING

 

HOISTING

Variables” and “function” declarations are moved to the top of their scope before code execution.

Variables are hosted and not their values

Only the normal function will be hoisted not the anonymous,IIFE and Arrow Function will be hoisted

Properties are not hoisted

PROPERTY

 Any variable declared globally  become property of window

variable declared without keyword

variable declared with keyword var except function scope var

console.log(a)  // Error a not defined

console.log(a); // undefined --> var a is hoisted not value

var a = 20;

console.log(a,b) // Error --->property b can't hoist

var a = 20;

b = 40;

var a =add(2,5) // Error

console.log(a)

var a =add(2,5) // 7 function add hoist

console.log(a)

function add(a,b)

{

    c=a+b;

    return c

}

USE STRICT