What are some examples of scope and closures in JavaScript?

What are some examples of scope and closures in JavaScript?

In JavaScript, scope refers to the visibility of variables. Closures are functions that remember their outer variables even when the outer function has finished executing. Would you like to see some code examples?

Yes, please provide a code example of a closure.

Sure! Here's a simple example:

function outerFunction() {
    let outerVariable = 'I am outside!';
    function innerFunction() {
        console.log(outerVariable);
    }
    return innerFunction;
}

const myClosure = outerFunction();
myClosure(); // Outputs: I am outside!

This demonstrates how innerFunction can access outerVariable even after outerFunction has executed.

That's great! Can you explain the difference between var, let, and const in terms of scope?

Absolutely! var is function-scoped, meaning it's accessible within the function it was declared. let and const are block-scoped, meaning they are only accessible within the nearest enclosing block (like an if statement or a loop). const also requires that the variable be assigned a value at the time of declaration and cannot be reassigned.