A closure is a function that "remembers" the variables of its outer scope even after that outer scope has finished executing.
How it works:
- You define a function inside another function.
- The inner function uses a variable from the outer function.
- Even when the outer function is done, the inner function keeps a reference to those variables in memory.
Problem Solved:
It solves the issue of Global Scope Pollution. It allows you to create "private" variables that can't be accessed or modified from the outside, keeping your data secure and isolated.
Use Case:
If you need a
counter that only one specific function can increase, you wrap the variable and the function inside a closure. This prevents other parts of the code from accidentally changing the count.
