Beginner Guide of Hoisting in JavaScript.

In any front-end developer interview, Interviewer most of the time ask about the hoisting of JavaScript, and sometime you don’t know about the hoisting , so here the guide about hoisting in JavaScript.

Hoisting is the process in which JavaScript interpreter move the declaration of function ,variable, class at the top of the scope prior to execution of code.
Hoisting provide us early access of function ,variable, class, before it’s declaration. user can access the function ,variable, class before it’s declaration.
In JavaScript, hoisting is available for the declaration, not for Initialization.
when user try to access the variable before it’s declaration he’ll get the undefined, because as I said JavaScript only hoist declaration not the initialization, Initialization is only done when line of initializing code is execute.

Hoisting in function gives us one of the major advantage, user can call the function before it’s declaration.
Hoisting is only work for the Named function, Anonymous type of function like fat arrow function doesn’t have Hoisting property.

Hoisting in variable is only work for declaration, not for initializing.
early access of variable before initialize it gives us undefined.
let, const variable doesn’t have the hoisting property, only var variable follow the declaration hoisting property.

Class Hoisting is only hoist the declaration, Initialize Hoisting doesn’t work on class hoisting. which means when JavaScript Interpreter find the reference of the class before it’s initialize, we’ll get the Reference Error.

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