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Closure means: function is called in the scope in which it was declared (created), not in which it was invoked (run). Ex:

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var scope = "global";

function testScope() {
	var scope = "local";
	function innerFunc() {
		return scope;
	}
	return innerFunc;
}
var innerFunc = testScope();
var answer = innerFunc();
document.getElementById("scope").innerHTML = answer;

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