What are block-scoped variables in JavaScript?

What are block-scoped variables in JavaScript?

Block-scoped variables are variables declared with let and const that are limited to the block in which they are defined.

Can you give me an example of how they work?

Sure! Here's an example:

if (true) {
    let x = 10;
    const y = 20;
    console.log(x, y); // Outputs: 10 20
}
console.log(x); // ReferenceError: x is not defined
console.log(y); // ReferenceError: y is not defined

What happens if I use var instead?

Using var would make the variable function-scoped or globally scoped, meaning it would be accessible outside the block.

So, let and const are better for avoiding scope issues?

Exactly! They help prevent accidental variable access and modifications outside their intended scope.