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  1. class Hash
  2.   alias orig_each each
  3.   def each(kwd = nil, &block)
  4.     begin
  5.       __send__("each_#{kwd}", &block)
  6.     rescue NoMethodError
  7.       orig_each(&block)
  8.     end
  9.   end
  10. end
  11.  
  12. if __FILE__ == $0
  13.   require 'test/unit'
  14.   class EachTest < Test::Unit::TestCase
  15.     def setup
  16.       @h = {a: 1, b: 2, c: 3}
  17.     end
  18.     def test_each_key
  19.       e = @h.each(:key)
  20.       assert_instance_of(Enumerator, e)
  21.       assert_equal(:a, e.next)
  22.       assert_equal(:b, e.next)
  23.       assert_equal(:c, e.next)
  24.       ary = []
  25.       @h.each(:key) do |key|
  26.         ary << key
  27.       end
  28.       assert_equal([:a, :b, :c], ary)
  29.     end
  30.     def test_each_value
  31.       e = @h.each(:value)
  32.       assert_instance_of(Enumerator, e)
  33.       assert_equal(1, e.next)
  34.       assert_equal(2, e.next)
  35.       assert_equal(3, e.next)
  36.       ary = []
  37.       @h.each(:value) do |value|
  38.         ary << value
  39.       end
  40.       assert_equal([1, 2, 3], ary)
  41.     end
  42.     def test_each_pair
  43.       e = @h.each(:pair)
  44.       assert_instance_of(Enumerator, e)
  45.       assert_equal([:a, 1], e.next)
  46.       assert_equal([:b, 2], e.next)
  47.       assert_equal([:c, 3], e.next)
  48.       ary = []
  49.       @h.each(:pair) do |value|
  50.         ary << value
  51.       end
  52.       assert_equal([[:a, 1], [:b, 2], [:c, 3]], ary)
  53.     end
  54.     def test_each_entry
  55.       e = @h.each(:entry)
  56.       assert_instance_of(Enumerator, e)
  57.       assert_equal([:a, 1], e.next)
  58.       assert_equal([:b, 2], e.next)
  59.       assert_equal([:c, 3], e.next)
  60.       ary = []
  61.       @h.each(:entry) do |value|
  62.         ary << value
  63.       end
  64.       assert_equal([[:a, 1], [:b, 2], [:c, 3]], ary)
  65.     end
  66.     def test_each
  67.       e = @h.each
  68.       assert_instance_of(Enumerator, e)
  69.       assert_equal([:a, 1], e.next)
  70.       assert_equal([:b, 2], e.next)
  71.       assert_equal([:c, 3], e.next)
  72.       ary = []
  73.       @h.each do |value|
  74.         ary << value
  75.       end
  76.       assert_equal([[:a, 1], [:b, 2], [:c, 3]], ary)
  77.     end
  78.   end
  79. end
  80.  
Success #stdin #stdout 0.03s 5840KB
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Standard input is empty
stdout
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Loaded suite prog
Started
.....
Finished in 0.000720 seconds.

5 tests, 25 assertions, 0 failures, 0 errors, 0 skips

Test run options: --seed 25423
https://ideone.com/6ndFO
language:
Ruby (ruby 2.5.5)
created:
13 years ago
visibility:
public

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