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What’s the difference between let and var in JavaScript?
Asked on Jan 31, 2026
Answer
In JavaScript, "let" and "var" are both used to declare variables, but they differ in terms of scope and hoisting behavior.
// Example of 'let' and 'var' scope
function example() {
if (true) {
let blockScoped = "I am block scoped";
var functionScoped = "I am function scoped";
}
console.log(functionScoped); // Works: "I am function scoped"
console.log(blockScoped); // Error: blockScoped is not defined
}
example();Additional Comment:
✅ Answered with JavaScript best practices.- "let" is block-scoped, meaning it is only accessible within the nearest enclosing block (e.g., inside a loop or an if statement).
- "var" is function-scoped, meaning it is accessible throughout the entire function in which it is declared.
- "let" does not allow re-declaration within the same scope, while "var" does.
- Both "let" and "var" are hoisted, but "let" is not initialized until the variable's definition is evaluated, which can lead to a "Temporal Dead Zone" if accessed before declaration.
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