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Scope ↔ Placewhere Variable is declared

Variable declare inside function store in VE of function's EC

Global Scope​

Outside any Block. Variableaccess everywhere

Block Scope​

Variable Lookup restrict to inside of Block

Function Scope​

Variable access restrict to only inside function body.

(For functions) VE is same as Scope

Scope of a variable​

Region of code where Variable can be accessed

!recall since JS has First-Class Functions - functions are just values stored in variables

References​

  1. TDZ ↔ Region of Code outside Scope of a variable, variable uninitialized from Scope start to Declaration

  2. Scope Chain ↔ Link to Variable from outer Scopes to current Scope

  3. Lexical Environment ↔ current Scope environ where JS Engine read Code

  4. Dependency ↔ any Variable local to FC Scope to control Hook Trigger

  5. [Variable](variable) inside [**_Scope_**](scope) of hook is not relevant [Dependency](dependency_deps-array) ↔ true