在Dart中获取集合/列表中数字总和的最干净方法是什么？ [英] What is the cleanest way to get the sum of numbers in a collection/list in Dart?

问题描述

除了我认为它看起来很丑外，我无缘无故不喜欢使用索引数组。有没有一种干净的方法可以对匿名函数求和？

I don't like using an indexed array for no reason other than I think it looks ugly. Is there a clean way to sum with an anonymous function? Is it possible to do it without using any outside variables?

推荐答案

Dart可迭代对象现在具有reduce函数（ https://code.google.com/p/dart/issues/detail?id=1649 ），因此您无需定义自己的折叠函数即可轻松进行总和：

Dart iterables now have a reduce function (https://code.google.com/p/dart/issues/detail?id=1649), so you can do a sum pithily without defining your own fold function:

var sum = [1, 2, 3].reduce((a, b) => a + b);

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