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HTML

<strong><label>Test Call Back with JS</label></strong>

JavaScript

/*Test Call Back */

var x=0;

function pow(x, n) {
  let result = 1;
  // multiply result by x n times in the loop
  for (let i = 0; i < n; i++) {
    result *= x;
  }

  return result;
}



	alert( pow(2, 3) );