如何从Dart中的函数返回多个值？ [英] How to return multiple values from function in Dart?

问题描述

说我有

Function(int x, int y) func = (int x, int y) {
  return (1, 2); // error
};

如何从上述函数实际返回（1、2）？

How to actually return (1, 2) from above function?

推荐答案

Dart中的方法只能返回一个值。因此，如果您需要返回多个值，则需要将它们打包在另一个对象中，例如

Methods in Dart can only return one value. So if you need to return multiple values you need to pack them inside another object which could e.g. be your own defined class, a list, a map or something else.

如果您使用x和y，则可以考虑使用 Point 来自 dart：math 的类：

In your case with x and y you could consider using the Point class from dart:math:

import 'dart:math';

Point<int> func(int x, int y) => Point(x, y);

此处支持在Dart中返回多个值：
https://github.com/dart-lang/language/issues/68

Support for returning multiple values in Dart are a ongoing discussion here: https://github.com/dart-lang/language/issues/68

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