1 | @obj = Object.new
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2 | class << @obj
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3 | include Enumerable
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4 | def foo *a
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5 | a.each { |x| yield x }
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6 | end
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7 | end
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8 |
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9 | assert 'Enumerator' do
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10 | assert_equal Class, Enumerator.class
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11 | end
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12 |
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13 | assert 'Enumerator' do
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14 | assert_equal Object, Enumerator.superclass
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15 | end
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16 |
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17 | assert 'Enumerator.new' do
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18 | assert_equal [0,1,2], 3.times.map{|i| i}.sort
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19 | assert_equal [:x,:y,:z], [:x,:y,:z].each.map{|i| i}.sort
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20 | assert_equal [[:x,1],[:y,2]], {x:1, y:2}.each.map{|i| i}.sort
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21 | assert_equal [1,2,3], @obj.to_enum(:foo, 1,2,3).to_a
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22 | assert_equal [1,2,3], Enumerator.new(@obj, :foo, 1,2,3).to_a
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23 | assert_equal [1,2,3], Enumerator.new { |y| i = 0; loop { y << (i += 1) } }.take(3)
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24 | assert_raise(ArgumentError) { Enumerator.new }
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25 | enum = @obj.to_enum
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26 | assert_raise(NoMethodError) { enum.each {} }
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27 |
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28 | # examples
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29 | fib = Enumerator.new do |y|
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30 | a = b = 1
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31 | loop do
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32 | y << a
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33 | a, b = b, a + b
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34 | end
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35 | end
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36 | assert_equal fib.take(10), [1,1,2,3,5,8,13,21,34,55]
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37 | end
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38 |
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39 | assert 'Enumerator#initialize_copy' do
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40 | assert_equal [1, 2, 3], @obj.to_enum(:foo, 1, 2, 3).dup.to_a
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41 | e = @obj.to_enum :foo, 1, 2, 3
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42 | assert_nothing_raised { assert_equal(1, e.next) }
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43 | assert_raise(TypeError) { e.dup }
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44 |
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45 | e = Enumerator.new { |y| i = 0; loop { y << (i += 1) } }.dup
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46 | assert_nothing_raised { assert_equal(1, e.next) }
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47 | assert_raise(TypeError) { e.dup }
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48 | end
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49 |
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50 | assert 'Enumerator#with_index' do
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51 | assert_equal([[1,0],[2,1],[3,2]], @obj.to_enum(:foo, 1, 2, 3).with_index.to_a)
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52 | assert_equal([[1,5],[2,6],[3,7]], @obj.to_enum(:foo, 1, 2, 3).with_index(5).to_a)
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53 | end
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54 |
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55 | assert 'Enumerator#with_index nonnum offset' do
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56 | s = Object.new
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57 | def s.to_int; 1 end
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58 | assert_equal([[1,1],[2,2],[3,3]], @obj.to_enum(:foo, 1, 2, 3).with_index(s).to_a)
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59 | end
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60 |
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61 | assert 'Enumerator#with_index string offset' do
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62 | assert_raise(TypeError){ @obj.to_enum(:foo, 1, 2, 3).with_index('1').to_a }
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63 | end
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64 |
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65 | assert 'Enumerator#with_object' do
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66 | obj = [0, 1]
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67 | ret = (1..10).each.with_object(obj) {|i, memo|
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68 | memo[0] += i
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69 | memo[1] *= i
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70 | }
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71 | assert_true(obj.equal?(ret))
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72 | assert_equal([55, 3628800], ret)
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73 | end
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74 |
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75 | assert 'Enumerator#with_object arguments' do
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76 | to_three = Enumerator.new do |y|
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77 | 3.times do |x|
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78 | y << x
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79 | end
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80 | end
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81 |
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82 | a = []
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83 | to_three_with_string = to_three.with_object("foo")
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84 | to_three_with_string.each do |x,string|
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85 | a << "#{string}:#{x}"
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86 | end
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87 | assert_equal ["foo:0","foo:1","foo:2"], a
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88 | end
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89 |
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90 | assert 'Enumerator#inspect' do
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91 | e = (0..10).each
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92 | assert_equal("#<Enumerator: 0..10:each>", e.inspect)
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93 | e = Enumerator.new("FooObject", :foo, 1)
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94 | assert_equal("#<Enumerator: FooObject:foo(1)>", e.inspect)
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95 | e = Enumerator.new("FooObject", :foo, 1, 2, 3)
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96 | assert_equal("#<Enumerator: FooObject:foo(1, 2, 3)>", e.inspect)
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97 | end
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98 |
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99 | assert 'Enumerator#each' do
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100 | o = Object.new
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101 | def o.each(ary)
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102 | ary << 1
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103 | yield
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104 | end
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105 | ary = []
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106 | e = o.to_enum.each(ary)
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107 | e.next
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108 | assert_equal([1], ary)
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109 | end
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110 |
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111 | assert 'Enumerator#each arguments' do
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112 | obj = Object.new
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113 |
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114 | def obj.each_arg(a, b=:b, *rest)
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115 | yield a
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116 | yield b
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117 | yield rest
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118 | :method_returned
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119 | end
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120 |
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121 | enum = obj.to_enum :each_arg, :a, :x
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122 |
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123 | assert_equal [:a, :x, []], enum.each.to_a
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124 | assert_true enum.each.equal?(enum)
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125 | assert_equal :method_returned, enum.each { |elm| elm }
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126 |
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127 | assert_equal [:a, :x, [:y, :z]], enum.each(:y, :z).to_a
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128 | assert_false enum.each(:y, :z).equal?(enum)
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129 | assert_equal :method_returned, enum.each(:y, :z) { |elm| elm }
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130 | end
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131 |
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132 | assert 'Enumerator#next' do
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133 | e = 3.times
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134 | 3.times { |i|
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135 | assert_equal i, e.next
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136 | }
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137 | assert_raise(StopIteration) { e.next }
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138 | end
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139 |
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140 | assert 'Enumerator#next_values' do
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141 | o = Object.new
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142 | def o.each
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143 | yield
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144 | yield 1
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145 | yield 1, 2
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146 | end
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147 | e = o.to_enum
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148 | assert_equal nil, e.next
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149 | assert_equal 1, e.next
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150 | assert_equal [1,2], e.next
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151 | e = o.to_enum
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152 | assert_equal [], e.next_values
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153 | assert_equal [1], e.next_values
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154 | assert_equal [1,2], e.next_values
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155 | end
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156 |
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157 | assert 'Enumerator#peek' do
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158 | a = [1]
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159 | e = a.each
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160 | assert_equal 1, e.peek
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161 | assert_equal 1, e.peek
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162 | assert_equal 1, e.next
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163 | assert_raise(StopIteration) { e.peek }
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164 | assert_raise(StopIteration) { e.peek }
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165 | end
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166 |
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167 | assert 'Enumerator#peek modify' do
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168 | o = Object.new
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169 | def o.each
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170 | yield 1,2
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171 | end
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172 | e = o.to_enum
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173 | a = e.peek
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174 | a << 3
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175 | assert_equal([1,2], e.peek)
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176 | end
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177 |
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178 | assert 'Enumerator#peek_values' do
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179 | o = Object.new
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180 | def o.each
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181 | yield
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182 | yield 1
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183 | yield 1, 2
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184 | end
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185 | e = o.to_enum
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186 | assert_equal nil, e.peek
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187 | assert_equal nil, e.next
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188 | assert_equal 1, e.peek
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189 | assert_equal 1, e.next
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190 | assert_equal [1,2], e.peek
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191 | assert_equal [1,2], e.next
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192 | e = o.to_enum
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193 | assert_equal [], e.peek_values
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194 | assert_equal [], e.next_values
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195 | assert_equal [1], e.peek_values
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196 | assert_equal [1], e.next_values
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197 | assert_equal [1,2], e.peek_values
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198 | assert_equal [1,2], e.next_values
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199 | e = o.to_enum
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200 | assert_equal [], e.peek_values
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201 | assert_equal nil, e.next
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202 | assert_equal [1], e.peek_values
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203 | assert_equal 1, e.next
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204 | assert_equal [1,2], e.peek_values
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205 | assert_equal [1,2], e.next
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206 | e = o.to_enum
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207 | assert_equal nil, e.peek
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208 | assert_equal [], e.next_values
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209 | assert_equal 1, e.peek
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210 | assert_equal [1], e.next_values
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211 | assert_equal [1,2], e.peek
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212 | assert_equal [1,2], e.next_values
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213 | end
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214 |
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215 | assert 'Enumerator#peek_values modify' do
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216 | o = Object.new
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217 | def o.each
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218 | yield 1,2
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219 | end
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220 | e = o.to_enum
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221 | a = e.peek_values
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222 | a << 3
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223 | assert_equal [1,2], e.peek
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224 | end
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225 |
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226 | assert 'Enumerator#feed' do
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227 | o = Object.new
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228 | def o.each(ary)
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229 | ary << yield
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230 | ary << yield
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231 | ary << yield
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232 | end
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233 | ary = []
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234 | e = o.to_enum :each, ary
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235 | e.next
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236 | e.feed 1
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237 | e.next
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238 | e.feed 2
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239 | e.next
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240 | e.feed 3
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241 | assert_raise(StopIteration) { e.next }
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242 | assert_equal [1,2,3], ary
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243 | end
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244 |
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245 | assert 'Enumerator#feed mixed' do
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246 | o = Object.new
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247 | def o.each(ary)
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248 | ary << yield
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249 | ary << yield
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250 | ary << yield
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251 | end
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252 | ary = []
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253 | e = o.to_enum :each, ary
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254 | e.next
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255 | e.feed 1
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256 | e.next
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257 | e.next
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258 | e.feed 3
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259 | assert_raise(StopIteration) { e.next }
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260 | assert_equal [1,nil,3], ary
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261 | end
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262 |
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263 | assert 'Enumerator#feed twice' do
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264 | o = Object.new
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265 | def o.each(ary)
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266 | ary << yield
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267 | ary << yield
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268 | ary << yield
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269 | end
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270 | ary = []
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271 | e = o.to_enum :each, ary
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272 | e.feed 1
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273 | assert_raise(TypeError) { e.feed 2 }
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274 | end
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275 |
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276 | assert 'Enumerator#feed before first next' do
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277 | o = Object.new
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278 | def o.each(ary)
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279 | ary << yield
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280 | ary << yield
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281 | ary << yield
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282 | end
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283 | ary = []
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284 | e = o.to_enum :each, ary
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285 | e.feed 1
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286 | e.next
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287 | e.next
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288 | assert_equal [1], ary
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289 | end
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290 |
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291 | assert 'Enumerator#feed yielder' do
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292 | x = nil
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293 | e = Enumerator.new {|y| x = y.yield; 10 }
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294 | e.next
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295 | e.feed 100
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296 | assert_raise(StopIteration) { e.next }
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297 | assert_equal 100, x
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298 | end
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299 |
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300 | assert 'Enumerator#rewind' do
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301 | e = @obj.to_enum(:foo, 1, 2, 3)
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302 | assert_equal 1, e.next
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303 | assert_equal 2, e.next
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304 | e.rewind
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305 | assert_equal 1, e.next
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306 | assert_equal 2, e.next
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307 | assert_equal 3, e.next
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308 | assert_raise(StopIteration) { e.next }
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309 | end
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310 |
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311 | assert 'Enumerator#rewind clear feed' do
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312 | o = Object.new
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313 | def o.each(ary)
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314 | ary << yield
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315 | ary << yield
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316 | ary << yield
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317 | end
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318 | ary = []
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319 | e = o.to_enum(:each, ary)
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320 | e.next
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321 | e.feed 1
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322 | e.next
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323 | e.feed 2
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324 | e.rewind
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325 | e.next
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326 | e.next
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327 | assert_equal([1,nil], ary)
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328 | end
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329 |
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330 | assert 'Enumerator#rewind clear' do
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331 | o = Object.new
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332 | def o.each(ary)
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333 | ary << yield
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334 | ary << yield
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335 | ary << yield
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336 | end
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337 | ary = []
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338 | e = o.to_enum :each, ary
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339 | e.next
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340 | e.feed 1
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341 | e.next
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342 | e.feed 2
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343 | e.rewind
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344 | e.next
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345 | e.next
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346 | assert_equal [1,nil], ary
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347 | end
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348 |
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349 | assert 'Enumerator::Generator' do
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350 | # note: Enumerator::Generator is a class just for internal
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351 | g = Enumerator::Generator.new {|y| y << 1 << 2 << 3; :foo }
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352 | g2 = g.dup
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353 | a = []
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354 | assert_equal(:foo, g.each {|x| a << x })
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355 | assert_equal([1, 2, 3], a)
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356 | a = []
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357 | assert_equal(:foo, g2.each {|x| a << x })
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358 | assert_equal([1, 2, 3], a)
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359 | end
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360 |
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361 | assert 'Enumerator::Generator args' do
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362 | g = Enumerator::Generator.new {|y, x| y << 1 << 2 << 3; x }
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363 | a = []
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364 | assert_equal(:bar, g.each(:bar) {|x| a << x })
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365 | assert_equal([1, 2, 3], a)
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366 | end
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367 |
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368 | assert 'Enumerator::Yielder' do
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369 | # note: Enumerator::Yielder is a class just for internal
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370 | a = []
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371 | y = Enumerator::Yielder.new {|x| a << x }
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372 | assert_equal(y, y << 1 << 2 << 3)
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373 | assert_equal([1, 2, 3], a)
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374 |
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375 | a = []
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376 | y = Enumerator::Yielder.new {|x| a << x }
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377 | assert_equal([1], y.yield(1))
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378 | assert_equal([1, 2], y.yield(2))
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379 | assert_equal([1, 2, 3], y.yield(3))
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380 |
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381 | assert_raise(LocalJumpError) { Enumerator::Yielder.new }
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382 | end
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383 |
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384 | assert 'next after StopIteration' do
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385 | a = [1]
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386 | e = a.each
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387 | assert_equal(1, e.next)
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388 | assert_raise(StopIteration) { e.next }
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389 | assert_raise(StopIteration) { e.next }
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390 | e.rewind
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391 | assert_equal(1, e.next)
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392 | assert_raise(StopIteration) { e.next }
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393 | assert_raise(StopIteration) { e.next }
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394 | end
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395 |
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396 | assert 'gc' do
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397 | assert_nothing_raised do
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398 | 1.times do
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399 | foo = [1,2,3].to_enum
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400 | GC.start
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401 | end
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402 | GC.start
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403 | end
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404 | end
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405 |
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406 | assert 'nested iteration' do
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407 | def (o = Object.new).each
|
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408 | yield :ok1
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409 | yield [:ok2, :x].each.next
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410 | end
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411 | e = o.to_enum
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412 | assert_equal :ok1, e.next
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413 | assert_equal :ok2, e.next
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414 | assert_raise(StopIteration) { e.next }
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415 | end
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416 |
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417 | assert 'Kernel#to_enum' do
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418 | assert_equal Enumerator, [].to_enum.class
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419 | assert_raise(ArgumentError){ nil.to_enum }
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420 | end
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421 |
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422 | assert 'modifying existing methods' do
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423 | assert_equal Enumerator, loop.class
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424 | e = 3.times
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425 | i = 0
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426 | loop_ret = loop {
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427 | assert_equal i, e.next
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428 | i += 1
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429 | }
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430 | end
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431 |
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432 | assert 'Integral#times' do
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433 | a = 3
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434 | b = a.times
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435 | c = []
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436 | b.with_object(c) do |i, obj|
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437 | obj << i
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438 | end
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439 | assert_equal 3, a
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440 | assert_equal Enumerator, b.class
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441 | assert_equal [0,1,2], c
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442 | end
|
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443 |
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444 | assert 'Enumerable#each_with_index' do
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445 | assert_equal [['a',0],['b',1],['c',2]], ['a','b','c'].each_with_index.to_a
|
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446 | end
|
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447 |
|
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448 | assert 'Enumerable#map' do
|
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449 | a = [1,2,3]
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450 | b = a.map
|
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451 | c = b.with_index do |i, index|
|
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452 | [i*i, index*index]
|
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453 | end
|
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454 | assert_equal [1,2,3], a
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455 | assert_equal [[1,0],[4,1],[9,4]], c
|
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456 | end
|
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457 |
|
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458 | assert 'Enumerable#find_all' do
|
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459 | assert_equal [[3,4]], [[1,2],[3,4],[5,6]].find_all.each{ |i| i[1] == 4 }
|
---|
460 | end
|
---|
461 |
|
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462 | assert 'Array#each_index' do
|
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463 | a = [1,2,3]
|
---|
464 | b = a.each_index
|
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465 | c = []
|
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466 | b.with_index do |index1,index2|
|
---|
467 | c << [index1+2,index2+5]
|
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468 | end
|
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469 | assert_equal [1,2,3], a
|
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470 | assert_equal [[2,5],[3,6],[4,7]], c
|
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471 | end
|
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472 |
|
---|
473 | assert 'Array#map!' do
|
---|
474 | a = [1,2,3]
|
---|
475 | b = a.map!
|
---|
476 | b.with_index do |i, index|
|
---|
477 | [i*i, index*index]
|
---|
478 | end
|
---|
479 | assert_equal [[1,0],[4,1],[9,4]], a
|
---|
480 | end
|
---|
481 |
|
---|
482 | assert 'Hash#each' do
|
---|
483 | a = {a:1,b:2}
|
---|
484 | b = a.each
|
---|
485 | c = []
|
---|
486 | b.each do |k,v|
|
---|
487 | c << [k,v]
|
---|
488 | end
|
---|
489 | assert_equal [[:a,1], [:b,2]], c.sort
|
---|
490 | end
|
---|
491 |
|
---|
492 | assert 'Hash#each_key' do
|
---|
493 | assert_equal [:a,:b], {a:1,b:2}.each_key.to_a.sort
|
---|
494 | end
|
---|
495 |
|
---|
496 | assert 'Hash#each_value' do
|
---|
497 | assert_equal [1,2], {a:1,b:2}.each_value.to_a.sort
|
---|
498 | end
|
---|
499 |
|
---|
500 | assert 'Hash#select' do
|
---|
501 | h = {1=>2,3=>4,5=>6}
|
---|
502 | hret = h.select.with_index {|a,b| a[1] == 4}
|
---|
503 | assert_equal({3=>4}, hret)
|
---|
504 | assert_equal({1=>2,3=>4,5=>6}, h)
|
---|
505 | end
|
---|
506 |
|
---|
507 | assert 'Hash#select!' do
|
---|
508 | h = {1=>2,3=>4,5=>6}
|
---|
509 | hret = h.select!.with_index {|a,b| a[1] == 4}
|
---|
510 | assert_equal h, hret
|
---|
511 | assert_equal({3=>4}, h)
|
---|
512 | end
|
---|
513 |
|
---|
514 | assert 'Hash#reject' do
|
---|
515 | h = {1=>2,3=>4,5=>6}
|
---|
516 | hret = h.reject.with_index {|a,b| a[1] == 4}
|
---|
517 | assert_equal({1=>2,5=>6}, hret)
|
---|
518 | assert_equal({1=>2,3=>4,5=>6}, h)
|
---|
519 | end
|
---|
520 |
|
---|
521 | assert 'Hash#reject!' do
|
---|
522 | h = {1=>2,3=>4,5=>6}
|
---|
523 | hret = h.reject!.with_index {|a,b| a[1] == 4}
|
---|
524 | assert_equal h, hret
|
---|
525 | assert_equal({1=>2,5=>6}, h)
|
---|
526 | end
|
---|
527 |
|
---|
528 | assert 'Range#each' do
|
---|
529 | a = (1..5)
|
---|
530 | b = a.each
|
---|
531 | c = []
|
---|
532 | b.each do |i|
|
---|
533 | c << i
|
---|
534 | end
|
---|
535 | assert_equal [1,2,3,4,5], c
|
---|
536 | end
|
---|