variable scope in javascript || variable scope in javascript in hindi
In JavaScript, variable scope determines the accessibility and visibility of variables within different parts of your code. It defines where a variable can be accessed and how long it exists during the execution of your program. JavaScript has two main types of variable scope: global scope and local scope.
Global Scope:
Variables declared outside any functions have global scope. They are accessible from anywhere in your code, including inside functions. Global variables are created when your script starts and persist until the page is closed or refreshed. To declare a global variable, you simply assign a value to it without using the var, let, or const keywords inside any function.
Global variables can be accessed and modified from any part of your code, which can be convenient but may also lead to potential issues like naming conflicts and unintended modifications.
Local Scope:
Variables declared within functions have local scope. They are only accessible within the function in which they are defined and any nested functions within that function. Local variables exist only during the execution of their enclosing function and are destroyed once the function finishes executing.
There are three ways to declare local variables in JavaScript: