JavaScript Scope JAVASCRIPT

JavaScript Function Scope

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.

Local variables are created when a function starts, and deleted when the function is completed.

A variable declared outside a function becomes GLOBAL.

A global variable has the global scope: All scripts and functions on a web page can access it.