Sort an array according to the elements of another array

Question

I have an array of ids

a1 = [1, 2, 3, 4, 5]  

and I have another array of objects with ids in random order

a2 = [(obj_w         


        

Answer 1

I like the accepted answer, but in ActiveSupport there is index_by which makes creating the initial hash even easier. See Cleanest way to create a Hash from an Array

In fact you could do this in one line since Enumerable supports index_by as well:

a2.index_by(&:id).values_at(*a1)