toString method

@override String toString()

A string representation of this object.

Some classes have a default textual representation, often paired with a static parse function (like int.parse). These classes will provide the textual representation as their string representation.

Other classes have no meaningful textual representation that a program will care about. Such classes will typically override toString to provide useful information when inspecting the object, mainly for debugging or logging.

Implementation

@override
String toString() {
  var cols = 20;
  var f = NumberFormat("###");

  StringBuffer sb = StringBuffer();
  for (var i = 0; i < _data.length; i++) {
    sb.write("$i) ");
    for (var j = 0; j < cols; j++) {
      var data = _data[i++];
      if (data == null) {
        sb.write("***");
      } else {
        sb.write(f.format(data));
      }
      sb.write(" ");

      if (i == _data.length) {
        break;
      }
    }
    i--;
    sb.write("\n");
  }

  return sb.toString();
}