Dart 絶対値を取得する

数値.abs()

void main() {
  print((10).abs());
  // 10
  print((-10).abs());
  // 10
  print((10.01).abs());
  // 10.01
  print((-10.01).abs());
  // 10.01
}

void main() {
  print(('-10').abs());
}

Error: The method 'abs' isn't defined for the class 'String'.
Try correcting the name to the name of an existing method, or defining a method named 'abs'.
  print(('-10').abs());
                ^^^

void main() {
  var n = -10;

  print(n < 0 ? -n : n); // 10
}