Ruby » Ruby master

TEST = %i[each find sort_by grep grep_v count detect find_index find_all select reject

   map flat_map partition group_by all? any? one? none?

   min_by max_by minmax_by reverse_each take_while drop_while sum uniq]

match_all = Object.new; def match_all.===(x); true; end

ARGS = {grep: match_all, grep_v: /never_match/}

class << o = Object.new

  include Enumerable

  def each

    return to_enum unless block_given?

    yield :a, 1

  end

  def foo(a,b)

  end

end

m = o.method(:foo)

ok = [{a: 1}, o, {a: 1}.each, o.each].map do |receiver|

  TEST.select do |method|

    (receiver.send(method, *ARGS[method], &m); :ok) rescue false

  end

end

labels = ['Hash', 'Custom yield', 'Hash#each', 'Custom yield#each']

puts "Takes arity 2 blocks in Ruby #{RUBY_VERSION}", *labels.zip(ok.map{|l| l.join(', ')}).flatten