code: function (arr, i) {
    var sum = 0,
      j;
  
    for (j = 0; j < i; j++) {
      sum += Math.abs(arr[j]);
    }
    for (j = i + 1; j < arr.length; j++) {
      sum += Math.abs(arr[j]);
    }
    return sum;
  }
docs: Add all of the elements in an array together except for the i'th one.
  This is a helper function for determining diagonal dominance, and it
  should be noted that each element is passed to Math.abs() beforehand.
  
  @param {Array} array
  @param {Int} index of element to ignore.
  @return {Number} sum.