What is Hoisting?

Hoisting is a JavaScript mechanism where variables and function declarations are moved to the top of their scope before code execution. Remember that JavaScript only hoists declarations, not initialization. Let's take a simple example of variable hoisting,

console.log(message); //output : undefined

var message = 'The variable Has been hoisted';

The above code looks like as below to the interpreter,

var message;

console.log(message);

message = 'The variable Has been hoisted';