How does block scope work in JavaScript?

Can you explain how block scope works in JavaScript?

Sure! Block scope in JavaScript refers to the visibility of variables defined within a block, such as inside curly braces {}. Variables declared with let and const are block-scoped, meaning they are only accessible 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

Are there any use cases for block scope?

Yes, block scope is useful for limiting the visibility of variables, preventing naming conflicts, and managing memory more efficiently.