Ask any question about JavaScript here... and get an instant response.
Post this Question & Answer:
What is the difference between 'let' and 'var' in JavaScript?
Asked on Mar 16, 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'
if (true) {
let x = 10;
console.log(x); // Outputs: 10
}
// console.log(x); // Error: x is not defined
// Example of 'var'
if (true) {
var y = 20;
console.log(y); // Outputs: 20
}
console.log(y); // Outputs: 20Additional Comment:
✅ Answered with JavaScript best practices.- "let" is block-scoped, meaning it is only accessible within the block it is defined in (e.g., inside an "if" statement).
- "var" is function-scoped, meaning it is accessible throughout the function in which it is declared, or globally if declared outside a function.
- "let" helps prevent errors due to variable hoisting and re-declaration within the same scope.
Recommended Links:
