Scope and function stack

Scope

A space or environment in which a particular variable or function can be accessed or used. Accessibility of this variable or function depends on where it is defined.

JavaScript has the following kinds of scopes:

• Global scope: The default scope for all code running in script mode.
• Module scope: The scope for code running in module mode.
• Function scope: The scope created with a function.
• Block scope: The scope created with a pair of curly braces (a block).

Function Stack (Call stack)

The function stack is how the interpreter keeps track of its place in a script that calls multiple functions, like which function is currently executing and which functions within that function are being called.

Visit the following resources to learn more:

• Function stack (call stack) - MDN
• Kinds of Scope - MDN