在 Coffeescript 中连接数组 [英] Concatenating an array of arrays in Coffeescript

问题描述

我试图在 Coffeescript 中找到一种优雅的方式来合并数组数组，以便 [[1,2,3],[4,5,6],[7,8,9]] ==> [1,2,3,4,5,6,7,8,9].

I'm trying to find an elegant way in Coffeescript to merge an array of arrays, so that [[1,2,3],[4,5,6],[7,8,9]] ==> [1,2,3,4,5,6,7,8,9].

正如您可能想象的那样，我需要这个，因为我正在从for in"构造中的函数生成数组，并且需要连接生成的嵌套数组:

As you might imagine, I need this because I'm generating arrays from a function in a "for in" construct and need to concatenate the resulting nested array:

result = (generate_array(x) for x in arr)

result = (generate_array(x) for x in arr)

有没有优雅的方法来处理这个问题?感谢您的任何指点！

Is there an elegant way to handle this? Thanks for any pointers!

推荐答案

就用JS成语吧:

 [].concat.apply([], a)

在 Coffee 中变得更好:

which becomes a little nicer in Coffee:

$ coffee -e 'a = [[1,2,3],[4,5,6],[7,8,9]]; console.dir [].concat a...'
[ 1, 2, 3, 4, 5, 6, 7, 8, 9 ]

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