What is the scope of variables in JavaScript loops?

What is the scope of variables in JavaScript loops?

In JavaScript, the scope of a variable declared with var is function-scoped, while let and const are block-scoped. This means that variables declared with let or const inside a loop are not accessible outside of that loop.

Can you give me an example of how let works in a loop?

Sure! Here's an example:

for (let i = 0; i < 3; i++) {
    console.log(i);
}
console.log(i); // This will throw a ReferenceError

In this case, i is not accessible outside the loop.

What about using var in a loop?

When you use var, the variable is function-scoped. For example:

for (var j = 0; j < 3; j++) {
    console.log(j);
}
console.log(j); // This will log 3

Here, j is accessible outside the loop.

Why should I prefer let over var?

Using let helps prevent issues related to variable hoisting and scope leakage, making your code more predictable and easier to debug.