What are some examples of closure in JavaScript?

What are some examples of closure in JavaScript?

Closures are functions that remember their outer variables even when the function is executed outside its original scope. A common example is a function that returns another function.

Can you show me a code example?

Sure! Here's a simple example:

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

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

What happens if I change the outer variable?

If you change the outer variable after the inner function is created, the inner function will still reference the original value of the outer variable at the time it was created.

Can closures lead to memory leaks?

Yes, if closures are not managed properly, they can lead to memory leaks by keeping references to variables that are no longer needed.