在Ruby中根据索引将数组拆分为多个数组答案

【问题标题】：Split array into multiple arrays in Ruby based on index在Ruby中根据索引将数组拆分为多个数组
【发布时间】：2013-11-20 17:07:23
【问题描述】：

我有以下数组：

array = [["Group EX (Instructor)", 0.018867924528301886], ["Personal Reasons", 0.018867924528301886]]

我需要将这个数组动态拆分为两个数组：

text_array = ["Group EX (Instructor)", "Personal Reasons"]

number_array = [0.018867924528301886,0.018867924528301886]

我目前正在这样做，这不可能是正确的方式：

array.each do |array|
  text_array << array[0]
  number_array << array[1]
end

【问题讨论】：

标签： ruby arrays multidimensional-array

【解决方案1】：

只需使用#transpose。

array = [["Group EX (Instructor)", 0.018867924528301886], ["Personal Reasons", 0.018867924528301886]]
a1, a2 = array.transpose
#=> [["Group EX (Instructor)", "Personal Reasons"],
 [0.018867924528301886, 0.018867924528301886]]

修复现有代码，

text_array = array.map { |x| x[0] } #give back first element of each subarray
number_array = array.map { |x| x[1] } #give back second element of each subarray

【讨论】：

【解决方案2】：

我会这样做：

array = [["Group EX (Instructor)", 0.018867924528301886], ["Personal Reasons", 0.018867924528301886]]
text_array,number_array = array.flatten.partition{|e| e.is_a? String }
text_array # => ["Group EX (Instructor)", "Personal Reasons"]
number_array # => [0.018867924528301886, 0.018867924528301886]

【讨论】：

【解决方案3】：

这也有效：

text_array, number_array = array.first.zip(array.last)

但transpose 显然是你想要的。

【讨论】：