Ruby:如何将数组的数组连接成一个 [英] Ruby: How to concatenate array of arrays into one

问题描述

我在Ruby on Rails(3.1)中有一个数组数组，其中所有内部数组的大小都不同.有没有一种方法可以轻松地将所有内部数组连接起来，使所有项目变成一个大一维数组?

I have an array of arrays in Ruby on Rails (3.1) where all the internal arrays are of different size. Is there a way to easily concatenate all the internal arrays to get one big one dimesional array with all the items?

我知道您可以使用Array :: concat函数来连接两个数组，并且我可以做一个循环来依次连接它们，就像这样:

I know you can use the Array::concat function to concatenate two arrays, and I could do a loop to concatenate them sequentially like so:

concatenated = Array.new
array_of_arrays.each do |array|
    concatenated.concat(array)
end

但是我想知道是否有像Ruby这样的单线纸可以更清洁地完成它.

but I wanted to know if there was like a Ruby one-liner which would do it in a cleaner manner.

感谢您的帮助.

推荐答案

您正在寻找

You're looking for #flatten:

concatenated = array_of_arrays.flatten

默认情况下，这将递归地平铺列表. #flatten接受一个可选参数来限制递归深度–文档列出了一些示例来说明差异.

By default, this will flatten the lists recursively. #flatten accepts an optional argument to limit the recursion depth – the documentation lists examples to illustrate the difference.

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