Lexical Environment in JavaScript
Lexical Environment in JavaScript: A Lexical Environment in JavaScript is a place where JavaScript keeps track of the variables and functions available in a particular scope . It also keeps a reference to the outer scope , so JavaScript can find variables that are not available in the current scope. In simple words, you can think of a lexical environment as a storage area for variables and…
Lexical Environment in JavaScript is a storage area for variables and functions within a particular scope, along with a reference to the outer scope. It plays a crucial role in managing variable accessibility and lookup in the language. When a function is called, JavaScript creates a new lexical environment for that function, containing its parameters and local variables.
Inner functions can access variables from their parent functions due to the lexical environment's hierarchical structure. The lookup process starts in the current lexical environment and moves outward until the variable is found or the global scope is reached. If the variable isn't found, a ReferenceError is thrown. The term "lexical" refers to the fact that variable scope is determined by the code's structure rather than the function's call context.
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