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recursion for exponents.

return 4 * func(4,2)
            return 4 * func(4,1)
                          return 4 * func(4,0)
                                      return 1
return 4 *          4 *          4 *        1 = 64

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function func(num, exp) {
	if (exp === 0) {
		return 1;
	}
	return num * func(num, exp-1);
}
var answer = func(4,3);  // returns 64 
document.getElementById("exp").innerHTML = answer;

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