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What is the difference between let and var in JavaScript?
Asked on Mar 18, 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' scope
function testScope() {
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
}
testScope();Additional Comment:
✅ Answered with JavaScript best practices.- "let" is block-scoped, meaning it is only accessible within the block it is defined in.
- "var" is function-scoped, meaning it is accessible throughout the function it is declared in.
- Using "let" helps prevent errors due to variable hoisting and unintended variable reassignments.
- "let" is generally preferred in modern JavaScript for its predictable scoping behavior.
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