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What is the difference between `let` and `var` in JavaScript?

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What is the difference between `let` and `var` in JavaScript?

Asked on Mar 15, 2026

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In JavaScript, "let" and "var" are both used to declare variables, but they have different scoping rules and behaviors. "let" is block-scoped, while "var" is function-scoped.

function example() {
            if (true) {
                let blockScoped = "I am block-scoped";
                var functionScoped = "I am function-scoped";
            }
            console.log(functionScoped); // Outputs: I am 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 where it is defined.
"var" is function-scoped, meaning it is accessible throughout the entire function in which it is declared.
Using "let" helps prevent errors due to variable hoisting and unintended overwrites.
"let" is generally preferred over "var" in modern JavaScript development.

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What is the difference between `let` and `var` in JavaScript?

Asked on Mar 15, 2026

Answer

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