These linked lexical environments form a scope "chain". Scope is formed of a linked nesting of lexical environments, with each level in the nesting corresponding to a lexical environment of an ancestor execution context. Scope is the region of the codebase over which an identifier is valid.Ī lexical environment is a mapping between identifier names and the values associated with them. Most other forms of identifier declaration have block scope in strict mode. Outside of the special cases of global and module scope, variables are declared using var (function scope), let (block scope), and const (block scope).
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