JavaScript Scope

JavaScript Scope

Scope refers to the availability of variables and functions in certain parts of the code.

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2 min read

Scope refers to the availability of variables and functions in certain parts of the code. In JavaScript, a variable has two types of scope:

  • Global Scope

  • Local Scope

Global Scope

A variable declared at the top of a program or outside a function is considered a global scope variable.

The value of a global variable can be changed inside a function. It is a good practice to avoid using global variables because the value of a global variable can be changed in different areas of the program. It can introduce unknown results in the program.

In JavaScript, a variable can also be used without declaring it. If a variable is used without declaring it, that variable automatically becomes a global variable.

Local Scope

A variable can also have a local scope. It can only be accessed within a function. The let keyword is block-scoped (the variable can be accessed only in the immediate block). And var keyword has function scope.

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