通过定义的数组元素的子字符串从定义范围返回子阵 [英] Return sub-array from defined range by substrings of defined array elements

问题描述

我有元素的有序阵列（独特的，而不是连续的）：

I have a sorted array of elements (unique and not consecutive):

array= ["AAA", "BBB", "CCC", "DDD", "EEE"]

我定义了一个范围的元素：

I defined a range of elements:

range_1 = ("CC" .. "DD")
range_2 = ("B" .. "E")

元素的范围仅仅是字符串是指一个阵列元素，但只有当 STARTS_WITH？是真正这些元素。例如：

The range of elements are just strings which refers to an array elements but only if starts_with? is true for these elements. Example:

"C", "CC" and "CCC" in range - fits to "CCC" in array
"D", "DD" and "DDD" in range - fits to "DDD" in array

所需结果 range_1 和 range_2 会是这样的：

result_1 = ["CCC", "DDD"]
result_2 = ["BBB", "CCC", "DDD", "EEE"]

如何在Ruby中实现这一点？

How to implement this in Ruby?

推荐答案

另一种方式：

def git_em(array, range)
  array.select {|e| range.any? {|r| e.start_with? r}}
end

array= ["AAA", "BBB", "CCC", "DDD", "EEE"]
range_1 = ("CC" .. "DD")
range_2 = ("B" .. "E")

git_em(array,range_1) # => ["CCC", "DDD"]
git_em(array,range_2) # => ["BBB", "CCC", "DDD", "EEE"] 

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