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function factorialize(num) { 
  for (var i = num - 1; i > 0; i--) {        
      num *= i;        
  }
  return num;
}

// Another one (mine)

function factorialize(num) {
    var factor = 1;
    for (var i = 1; i < num + 1; i++) {        
        factor *= i;        
    }
    return factor;
  }