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    WTF is a Closure?


    Closure is a buzzword you'll hear in most of your programming interviews. Some say that understanding what a closure is can affect the salary your offered tremendously. So what the heck is a closure? At its simplest definition, it's a nested function that has access to at least three levels of scopes (it's own scope, the parent scope, and the global scope). Let's write out some code of a closure in action and break down what makes it unique.