What are block scopes in JavaScript?

Can you explain what block scopes are in JavaScript?

Sure! Block scope in JavaScript refers to the visibility of variables defined within a block, such as inside curly braces {}.

How does it differ from function scope?

Great question! Function scope allows variables to be accessible within the entire function, while block scope restricts access to the block only.

Can you give me an example of block scope?

Of course! Here's an example:

if (true) {
    let x = 10; // x is block scoped
}
console.log(x); // ReferenceError: x is not defined

What about using var inside a block?

Using var inside a block does not create a block scope. The variable will be hoisted to the function scope or global scope.