#closure

1. 1. A closure is created when a function is defined within another function and inner function need to access variables in the outer function's scope.
2. 2. Closure helps to achieve lexical scope from child function to parent function.
3. 3. Closure preserves the state of parent function even after the execution of parent function is completed.
4. 4. A child function will have reference to the closure.
5. 5. Every time a parent function is called the new closure is created.
6. 6. Disadvantage : High memory consumption.