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.
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