发现元素的总和斯威夫特阵列 [英] Finding sum of elements in Swift array

问题描述

这是最简单的（最好）的方式找到在迅速整数数组的总和？
我有一个数组称为倍数，我想知道的倍数的总和。谢谢你在前进！

What is the easiest (best) way to find the sum of an array of integers in swift? I have an array called multiples and I would like to know the sum of the multiples. Thank you in advance!

推荐答案

这是我能找到的最简单/最短的方法。

This is the easiest/shortest method I can find.

let multiples = [...]
sum = multiples.reduce(0, combine: +)

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一些更多的信息：

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Some more info:

本使用Array的降低方法（文档<一个href=\"https://developer.apple.com/library/$p$prelease/ios/documentation/Swift/Reference/Swift_SequenceType_Protocol/index.html#//apple_ref/swift/intfm/SequenceType/s:FeRq_Ss12SequenceType_SsS_6reduceu__Rq_S__Fq_FzTqd__7combineFzTqd__qqq_S_9GeneratorSs13GeneratorType7Element_qd___qd__\">here),它允许你通过递归应用提供封闭元素的集合减少到一个单一的价值。我们给它0作为初始值，然后，从本质上讲，封闭 {$ 0 + $ 1} 。当然，我们可以简化到一个加号，因为这是如何斯威夫特卷。

This uses Array's reduce method (documentation here), which allows you to "reduce a collection of elements down to a single value by recursively applying the provided closure". We give it 0 as the initial value, and then, essentially, the closure { $0 + $1 }. Of course, we can simplify that to a single plus sign, because that's how Swift rolls.

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