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Scope of a variable ↔ Region of code where Variable can be accessed

All scopes have access to variables from all outer scopes which it looks up through the Scope Chain

Scope Chain​

Upwards Unidirectional access to Variables from current scope to outer scopes via Variable Lookup

Variable Lookup​

(process) to look upwards for Variables in Scope Chain, when not in Lexical Environment

Variables are not copied from parent to child

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!note scope chain is unrelated to the call stack and order of function calls

References​

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