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What is the difference between let and var in JavaScript?

Asked on Jan 24, 2026

Answer

"let" and "var" are both used to declare variables in JavaScript, but they have different scoping rules and behaviors. "let" is block-scoped, while "var" is function-scoped.
// Example of "let" and "var" scoping
        function example() {
            if (true) {
                let blockScoped = "I'm block-scoped";
                var functionScoped = "I'm function-scoped";
            }
            console.log(functionScoped); // Output: I'm function-scoped
            console.log(blockScoped);    // ReferenceError: blockScoped is not defined
        }
        example();
Additional Comment:
  • "let" is block-scoped, meaning it is only accessible within the block it is defined in (e.g., inside an "if" statement or loop).
  • "var" is function-scoped, meaning it is accessible throughout the entire function it is declared in.
  • Using "let" helps prevent errors related to variable hoisting and unintended access outside of the intended scope.
  • "let" is generally preferred over "var" in modern JavaScript for better code clarity and maintainability.
✅ Answered with JavaScript best practices.
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