Closures

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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.

function init() {
  var name = 'Mozilla'; // name is a local variable created by init
  function displayName() { // displayName() is the inner function, a closure
    alert(name); // use variable declared in the parent function
  }
  displayName();
}
init();

//Result
Mozilla