红宝石：两个数组的总和对应的成员 [英] ruby: sum corresponding members of two arrays

问题描述

我有两个（或更多）阵列，在每个12个整数（值相对应的每个月）。我想要的是将它们添加在一起，这样我得为每月汇总值单个阵列。这里有三个值的示例：
[1,2,3]和[4,5,6] => [5,7,9]

I've got two (or more) arrays with 12 integers in each (corresponding to values for each month). All I want is to add them together so that I've got a single array with summed values for each month. Here's an example with three values: [1,2,3] and [4,5,6] => [5,7,9]

我能想出的最好成绩是：

The best I could come up with was:

[[1,2,3],[4,5,6]].transpose.map{|arr| arr.inject{|sum, element| sum+element}} #=> [5,7,9]

是否有这样做的更好的办法？这似乎只是这样一个基本的事情要做。

Is there a better way of doing this? It just seems such a basic thing to want to do.

推荐答案

这里的转版本阿努拉格建议：

Here's the transpose version Anurag suggested:

a.transpose.map {|x| x.reduce(:+)}

这将与任意数量的分量数组的工作。 减少和注是同义词，但减少在我看来，在这里更清楚地传达code的意图...

This will work with any number of component arrays. reduce and inject are synonyms, but reduce seems to me to more clearly communicate the code's intent here...

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