What are some examples of scope in JavaScript?

What are some examples of scope in JavaScript?

In JavaScript, scope refers to the visibility of variables. For example, variables declared inside a function are not accessible outside of it.

Can you give me an example of function scope?

Sure! Here's a simple example:

function myFunction() {
    var x = 10; // x is function-scoped
    console.log(x);
}
myFunction();
console.log(x); // This will throw an error because x is not defined outside the function.

What about block scope?

Block scope is created by curly braces {}. For example:

if (true) {
    let y = 20; // y is block-scoped
    console.log(y);
}
console.log(y); // This will throw an error because y is not defined outside the block.

Are there any differences between var, let, and const?

Yes! var is function-scoped, while let and const are block-scoped. Additionally, const cannot be reassigned after its initial assignment.