Can you explain block scope in JavaScript?

Can you explain block scope in JavaScript?

Sure! Block scope in JavaScript refers to the visibility of variables within a specific block of code, such as within curly braces {}. Variables declared with let and const are block-scoped, meaning they can only be accessed within that block.

What happens if I declare a variable with var inside a block?

If you declare a variable with var inside a block, it is function-scoped, not block-scoped. This means it will be accessible outside the block if it's within the same function.

Can you give me an example of block scope?

Certainly! Here's an example:

if (true) {
    let blockScopedVar = 'I am block scoped';
    console.log(blockScopedVar); // This will log the variable
}
console.log(blockScopedVar); // This will throw a ReferenceError

Why should I use let or const instead of var?

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