Reversing enumerable in Ruby
enumerable, ruby
Solution
From 1.8.7, `Enumerable#each_*` methods return an enumerator when no block is provided, so those originally imperative methods can now be used in pure expressions.
So, if you want to collect items, use `Enumerable#map` on that enumerator:
reversed_values = [1, 2, 3].reverse_each.map { |x| 2*x }
#=> [6, 4, 2]
Problem
I'm trying to reverse Enumerable (like Array) without using `reverse` method, but using `reverse_each` iterator. I hoped, that following code is enough: ``` p [1,2,3].reverse_each {|v| v } ``` however the block doesn't return array in reversed orded. Of course I could write ``` [1,2,3].reverse_each {|v| p v } ``` but I'd like to collect items in the first way. What is the source if this behaviour and how should I write my expression to fulfill requirement?