Closures and Scope

Question 1

What can cause memory leaks in closures?

Answer 1

Closures can cause memory leaks if they retain references to large objects unnecessarily.

This occurs when an inner function holds onto variables that are no longer needed.

Question 2

How can you avoid unintended closure behavior in loops?

Answer 2

Use let instead of var or wrap the iteration inside an IIFE (Immediately Invoked Function Expression).

Using let creates a new binding for each iteration.

Question 3

What is the output of the following code when counter1 and counter2 are called?

Answer 3

1, 2, 1

counter1 and counter2 have separate closures, each with its own count variable.