JavaScript Scope
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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