查找 Swift 数组中元素的总和 [英] Finding sum of elements in Swift array

问题描述

在 swift 中找到整数数组的总和的最简单(最佳)方法是什么?我有一个名为 multiples 的数组，我想知道倍数的总和.

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.

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.

Swift 3 和 Swift 4:

Swift 3 and Swift 4:

let multiples = [...]
let sum = multiples.reduce(0, +)
print("Sum of Array is : ", sum)

斯威夫特 2:

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

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更多信息:

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Some more info:

这使用了 Array 的 reduce 方法(文档 here)，这允许您通过reduce提供的单个值集合向下还原提供的元素.我们给它 0 作为初始值，然后基本上是闭包 { $0 + $1 }.当然，我们可以将其简化为一个加号，因为这就是 Swift 滚动的方式.

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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