Skip to main content

Lexical Environment ↔ current Scope environ where JS Engine read Code

each EC tells JS Engine which Lexical Environment currently working in & determines which Variable available in Lexical Scope

References​

  1. Block ↔ Source Code Encapsulate in { } curly braces (excl Object Literals) to define boundary of Lexical Environment

  2. Variable Lookup ↔ (process) to look upwards for Variables in Scope Chain, when not in Lexical Environment