拆分字母串入三分球迅速 [英] Splitting a string of letters into 3s in swift

问题描述

在这里斯威夫特新手。我想我的一些蟒蛇code的转换迅速和IM停留在的地步，我需要的字母串分割成和阵列，每个项目为3个字母：

Swift newbie here. I am trying to convert some of my python code to swift and im stuck at the point where I need to split a string of letters into and array with each item being 3 letters:

例如我的Python code是如下：

For example my python code is as follows:

name = "ATAGASSTSSGASTA"
threes =[]
for start in range(0, len(name),3):
   threes.append(name[start : start + 3])
print threes

有关香港专业教育学院迅速来到这么远：

For swift ive come as far as this:

var name = "ATAGASSTSSGASTA"
let namearr = Array(name)
let threes = []
threes.append(namearr[0...3])

这给了我一个错误。

我知道有可能做到这一点的更简单的方法，但我一直没能找到我的研究什么。任何帮助AP preciated！

I realize there may be an much easier way to do this, but I have not been able to find anything in my research. Any help is appreciated!

推荐答案

这是简单而SWIFTY办法做到这一点是映射使用步幅和字符数组事先功能：

An easy and Swifty way to do this is to map an array of chars using the stride and advance functions:

let name = Array("ATAGASSTSSGASTA")

let splitName = map(stride(from: 0, to: name.count, by: 3)) {
    String(name[$0..<advance($0, 3, name.count)])
}

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