What is closure in JavaScript?

What is closure in JavaScript?

Closure is a feature in JavaScript where an inner function has access to the outer function's variables even after the outer function has executed.

Can you give me an example of how closure works?

Sure! Here's a simple example:

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

const innerFunc = outerFunction();
innerFunc(); // Outputs: I am from outer function

What about scope? How is it different from closure?

Scope refers to the visibility of variables in different parts of your code. Closure uses scope to remember the environment in which it was created.

Can closures lead to memory leaks?

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