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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 Apr 10, 2026

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In JavaScript, "let" and "var" are both used to declare variables, but they differ in scope and hoisting behavior. "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); // Works
            console.log(blockScoped);    // Error: blockScoped is not defined
        }
        example();

Additional Comment:

"let" is block-scoped, meaning it is only accessible within the block it is declared.
"var" is function-scoped, meaning it is accessible throughout the function.
"let" does not allow re-declaration in the same scope, while "var" does.
"let" is generally preferred for modern JavaScript due to its predictable scoping.

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What is the difference between let and var in JavaScript?

Asked on Apr 10, 2026

Answer

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