JavaScript Tutorial in Hindi for Beginners [Part 22] - Global variable vs Local variable

Published: 03 March 2021
on channel: Tech Gun

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In this video i will talk about Global variable vs Local variable in JavaScript.

In JavaScript there are two types of scope:

Local scope
Global scope
JavaScript has function scope: Each function creates a new scope.

Scope determines the accessibility (visibility) of these variables.

Variables defined inside a function are not accessible (visible) from outside the function.

Local JavaScript Variables
Variables declared within a JavaScript function, become LOCAL to the function.
Local variables have Function scope: They can only be accessed from within the function.

Global JavaScript Variables
A variable declared outside a function, becomes GLOBAL.
A global variable has global scope: All scripts and functions on a web page can access it.

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