Dart 2.1 int-2-double example for DartPad

readme.md

Dart 2.1 sample

Copied from https://github.com/dart-lang/dartpad_examples/blob/1bfb796f865d60fa1f8ca83feac1a0efe85de835/example/dart_2_1/int_to_double.dart

main.dart

// Copyright (c) 2018, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'dart:math' as math;

class Circle {
  double radius;

  Circle(this.radius);

  double get area => math.pi * math.pow(radius, 2);
}

void main() {
  // Before Dart 2.1, you had to provide a trailing `.0` – `42.0` – when
  // assigning to fields or parameters of type `double`.
  // A value like `42` was not allowed.

  print(Circle(2.0).area); // Before Dart 2.1, the trailing `.0` is required.

  // With Dart 2.1, you can provide whole-number values when assigning to
  // a double without the trailing `.0`.
  print(Circle(2).area); // Legal with Dart 2.1
}