code: function argMax(array) {
      var maxIndex = 0
       , i
       ;
      for (i = 0; i < array.length; i++) {
        if (array[i] > array[maxIndex]) {
          maxIndex = i;
        }
      }
      return maxIndex;
    }
docs: Return the index of the maximum value in the array.
  @param array - an array of numerical values
  @return the index of the largest value in the array.