The Power of Closures:
- Callback Functions: Closures are the backbone of callback functions. When a function is defined inside another function, it captures the outer function’s scope. This captured context is preserved when the inner function is invoked, enabling it to access and manipulate variables from the parent scope.
- Functional Programming: Closures play a pivotal role in functional programming. They enable the creation of pure functions that rely only on their input and the data encapsulated within them, promoting immutability and predictability.
Let’s Dive into an Example:
In this example,
inner is a closure because it retains access to the
count variable even after
outer has completed execution. This leads to the expected increment each time
closureFunction is invoked.