Accessing the last key–value pair in a Ruby (1.9) hash
As of Ruby 1.9, hashes retain insertion order which is very cool. I want to know the best way to access the last key–value pair. I've written some code which does this: hash.values.last This works and is very easy to comprehend, but perhaps it's possible to access the last value directly, rather that via an intermediary (the array of values). Is it?
Sort hash by key, return hash in Ruby
Would this be the best way to sort a hash and return Hash object (instead of Array): h = {"a"=>1, "c"=>3, "b"=>2, "d"=>4} # => {"a"=>1, "c"=>3, "b"=>2, "d"=>4} Hash[h.sort] # => {"a"=>1, "b"=>2, "c"=>3, "d"=>4}
Unique on an array of hashes based on value
I feel like this could be improved (a common feeling in ruby). I'm trying to uniq an array of hashes based on value. In this example, I want the colors of the elements. Moss and snow are impostors. # remove unique array of hashes based on a hash value a = [ { :color => "blue", :name => "water" }, { :color => "red", :name => "fire" }, { :color => "white", :name => "wind" }, { :color => "green", :na
Rubyでハッシュの配列によるソート - hogemaru さわやか日記
ハッシュの配列をソートしたいときに詰まったのでメモ サンプルソース hogeArray = Array.new #input p "Before" for j in 1..10 hogeHash = Hash.new hogeHash['id'] = rand(1024) hogeHash['huga'] = 'hogehoge' p "id:#{hogeHash['id']} huga:#{hogeHash['huga']}" hogeArray.push hogeHash end #sort hogeArray = hogeArray.sort_by{|val| val['id']} p "After" hogeArray.each do |hogeHash| p "id:#{hogeHash['id']} huga:#{hogeHash['huga']}" end 実行結果 "Bef
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