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What is the difference between let and var in JavaScript?
Asked on Apr 28, 2026
Answer
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.
// Example of 'let' and 'var' scoping
function example() {
if (true) {
let blockScoped = "I am block scoped";
var functionScoped = "I am function scoped";
}
console.log(functionScoped); // Works fine
console.log(blockScoped); // ReferenceError: blockScoped is not defined
}
example();Additional Comment:
✅ Answered with JavaScript best practices.- "let" is block-scoped, meaning it is only accessible within the block it is defined.
- "var" is function-scoped, meaning it is accessible throughout the function in which it is declared.
- Using "let" can help avoid errors related to variable hoisting and scope leakage.
- "let" is generally preferred in modern JavaScript for its predictable scoping behavior.
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