Question

我有一个大的Ruby数组，我会分成更小的数组。我并不关心每个数组中有多少项，而是关心指定最终会有多少个数组。我将在列中显示项目。例如，如何将数组拆分为两个或三个较小的数组？

Answer 1

如果你正在使用Rails（你没说），你可以使用in_groups。

%w(1 2 3 4 5 6 7 8 9 10).in_groups(3) {|group| p group}
["1", "2", "3", "4"]
["5", "6", "7", nil]
["8", "9", "10", nil]

http://api.rubyonrails.org/classes/Array.html#method-i-in_groups

或者，如果不是Rails，只需获取该方法的来源......

Answer 2

如果没有Rails，我会使用each_slice：

2.0.0p247 :006 > arr = %w(1 2 3 4 5 6 7 8 9 10)
 => ["1", "2", "3", "4", "5", "6", "7", "8", "9", "10"] 

2.0.0p247 :007 > n = 3  # how many arrays you want
 => 3

2.0.0p247 :009 > arr.each_slice((arr.size/n.to_f).ceil) {|slice| p slice };nil
["1", "2", "3", "4"]
["5", "6", "7", "8"]
["9", "10"]
 => nil

Answer 3

list = (1..10).to_a
nsublists = 3
sublists = []
list.each_slice((list.size.to_f/nsublists).ceil) { |slice| sublists << slice }

sublists # => [[1, 2, 3, 4], [5, 6, 7, 8], [9, 10]]

如何将Ruby数组拆分为一定数量的较小数组？

3 个答案: