Building Hash by grouping array of objects based on a property of the items

Question

I\'m wondering if there is a more canonical way to do this in ruby 1.9

I have an array with a bunch of objects and I want to group them into a Hash using a property of e

Answer 1

You can also accomplish this by chaining methods... which might only be of academic interest for this problem, but is still a good technique to be familiar with.

irb(main):017:0> sh = {}
=> {}
irb(main):018:0> aers.collect{|k| k.size}.uniq!.each{|k| sh[k] = aers.select{|j| j.size == k}}
=> [1, 2, 3]
irb(main):019:0> sh
=> {1=>["a", "b", "c", "d"], 2=>["ab", "bc", "de"], 3=>["abc"]}
irb(main):020:0>