Javascript Variables Var Vs Let 72y1TQcwsTE

Web Reference: Apr 18, 2009 · Scoping rules The main difference is scoping rules. Variables declared by var keyword are scoped to the immediate function body (hence the function scope) while let variables are scoped to the immediate enclosing block denoted by { } (hence the block scope). Jul 11, 2025 · With the introduction of ES6 in 2015 two more keywords, let and const came into the picture. var and let are both used for variable declaration in javascript but the difference between them is that var is function scoped and let is block scoped. Whether you are tracking a user's score, holding an API response, or counting loop iterations, you are using variables. JavaScript offers three ways to declare variables: let, const, and var. Each behaves differently in subtle but important ways, and choosing the right one matters.

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