+ What kind of return values are faster?

experiments/return_values.rb

@@ -0,0 +1,25 @@
+def pair
+  [true, "123"]
+end
+
+Success = Struct.new(:value)
+def struct
+  Success.new("123")
+end
+
+class SuccessO
+  def initialize(value)
+    @value = value
+  end
+end
+def klass
+  SuccessO.new("123")
+end
+
+n = 1000_000
+require 'benchmark'
+Benchmark.bmbm(9) do |bm|
+  bm.report(:pair)    { n.times do pair end }
+  bm.report(:struct)  { n.times do struct end }
+  bm.report(:klass)  { n.times do klass end }
+end