Obj

A Struct replacement that allows default arguments, and omits the
hash-style API that Struct implements.

Installation

gem install ruby-obj

Usage

require 'obj'
class One < Obj.new(:one, two: :default)
end
obj = One.new(1)
obj.one  # => 1
obj.one? # => true
obj.two  # => :default
obj.two? # => true
obj = One.new(nil)
obj.one? # => false

Modules included to Obj are propagated to all instances:

module Foo
  def foo
  end
end
Obj.include(Foo)
class One < Obj.new(:one)
end
one = One.new(1)
one.respond_to?(:foo) # => true

Benchmark

Obj is marginally slower than Struct (which is implemented in C):

require 'benchmark'
require 'obj'
n = 1_000_000
str = Struct.new(:foo)
obj = Obj.new(:foo)
Benchmark.bm(10) do |b|
  b.report('str:') { n.times { str.new(:foo).foo } }
  b.report('obj:') { n.times { obj.new(:foo).foo } }
end

                 user     system      total        real
str:         0.180000   0.000000   0.180000 (  0.174254)
obj:         0.180000   0.000000   0.180000 (  0.181985)