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JavaScript closure interview questions

Here are some best Javascript closure interview questions 2018 asked by Javascript interviewer in Interviews.

What is Closure?

A closure is a combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment). In other words, a closure gives you access to an outer function’s scope from an inner function. In JavaScript, closures are created every time a function is created, at function creation time.