code: function splitLongWord(word, widths_array, firstLineMaxLen, maxLen) {
      var answer = []; // 1st, chop off the piece that can fit on the hanging line.
  
      var i = 0,
          l = word.length,
          workingLen = 0;
  
      while (i !== l && workingLen + widths_array[i] < firstLineMaxLen) {
        workingLen += widths_array[i];
        i++;
      } // this is first line.
  
  
      answer.push(word.slice(0, i)); // 2nd. Split the rest into maxLen pieces.
  
      var startOfLine = i;
      workingLen = 0;
  
      while (i !== l) {
        if (workingLen + widths_array[i] > maxLen) {
          answer.push(word.slice(startOfLine, i));
          workingLen = 0;
          startOfLine = i;
        }
  
        workingLen += widths_array[i];
        i++;
      }
  
      if (startOfLine !== i) {
        answer.push(word.slice(startOfLine, i));
      }
  
      return answer;
    }
docs: returns array of lines