toString method

@override String toString({ int precision = 6, })

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({int precision = 6}) {
  var header = '${shape.item1}x${shape.item2} matrix';
  var maxPrecision = [
    for (var line in values)
      for (var entry in line) entry.toStringAsFixed(precision).length
  ].fold(precision, max);

  var minPadding = 4;
  var indent = '      ';
  var content = '';
  for (var line in values) {
    content += '$indent';
    for (var value in line) {
      var negPrev = value < 0 ? '-' : ' ';
      var spaceCount = maxPrecision +
          minPadding -
          value.abs().toStringAsFixed(precision).length;
      var spaces = [for (var _ in range(end: spaceCount)) ' '].join();
      content += negPrev;
      content += value.abs().toStringAsFixed(precision);
      content += spaces;
    }
    content += '\n';
  }

  return '$header\n$content';
}