Question

I have two arrays:

 array1 = [:key1, :key2]
 array2 = [[:key1,2],[:key2,8],[:key3,1]]

I would like to have an array of arrays in array2 whose :key... exists in array1. For example, for the above:

 result = [[:key1,2],[:key2,8]]

Answer 1

This satisfies your example:

array2.select {|key,value| array1.include?(key) }