Why does scope matter in JavaScript?
It provides encapsulation (keep variables private), avoids naming collisions, allows the engine to free memory when scope ends, and makes code more predictable and easier to reason about.
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More FAQs in What Is Scope in JavaScript?
Scope is the set of rules that determines where variables are accessible. JavaScript has global scope, function scope, block scope, and module scope.
Function scope means a variable is visible throughout the function (var). Block scope means a variable is visible only within the nearest enclosing block (let and const). var ignores block boundaries; let and const respect them.
Yes. let and const are block-scoped. They are only accessible within the nearest enclosing pair of braces. var is function-scoped and ignores block boundaries (except function bodies).
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