Variable Scope
Variable scope in JavaScript is the region of the code where a particular variable can be accessed or modified.
Types of Scopes in JavaScript:
- Block scope
- Function scope
- Local scope
- Global scope
What is Variable Scope in JavaScript ?
Variable scope is the context of the program in which it can be accessed. In programming, a variable is a named storage location that holds data or a value. Think of it as a container that you can use to store and manipulate information in your code. Variables allow you to work with data in a flexible way, as the values they hold can change during the execution of a program.
Table of Content
- Variable Scope
- Block scope
- Function scope
- Local scope
- Global scope
In JavaScript, you can declare variables using the var, let, or const keywords. Here’s a brief overview of each:
|
Variable Declaration |
Description |
|---|---|
|
The oldest way to declare variables. It has function scope and is hoisted. |
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Introduced in ECMAScript 6 (ES6). It has block scope and is also hoisted. |
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Also introduced in ES6. It is used to declare constants and has block scope. Unlike |
Now, let’s delve into the concept of Variable Scope in JavaScript: