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"let" and "var" are both used to declare variables in JavaScript, but they differ in terms of scope and hoisting behavior. function testScope() { if (true) { var x = "var scope"; let y = "let scope"; } console.log(x); // Outputs: "var scope" console.log(y); // ReferenceError: y is not defined } testScope(); ADDITIONAL COMMENT: - "var" is function-scoped, meaning it is accessible throughout the entire function in which it is declared. - "let" is block-scoped, meaning it is only accessible within the block (e.g., inside an "if" statement) where it is declared. - Both "var" and "let" are hoisted, but "var" is initialized with "undefined" while "let" is not initialized, leading to a "Temporal Dead Zone" until the declaration is encountered. ✅

What are the differences between let and var in terms of scope and hoisting?

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What are the differences between let and var in terms of scope and hoisting?

Asked on Feb 16, 2026

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"let" and "var" are both used to declare variables in JavaScript, but they differ in terms of scope and hoisting behavior.

function testScope() {
            if (true) {
                var x = "var scope";
                let y = "let scope";
            }
            console.log(x); // Outputs: "var scope"
            console.log(y); // ReferenceError: y is not defined
        }
        
        testScope();

Additional Comment:

"var" is function-scoped, meaning it is accessible throughout the entire function in which it is declared.
"let" is block-scoped, meaning it is only accessible within the block (e.g., inside an "if" statement) where it is declared.
Both "var" and "let" are hoisted, but "var" is initialized with "undefined" while "let" is not initialized, leading to a "Temporal Dead Zone" until the declaration is encountered.

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What are the differences between let and var in terms of scope and hoisting?

Asked on Feb 16, 2026

Answer

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