1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
##
# Enumerable(Ext) Test
assert("Enumerable#drop") do
a = [1, 2, 3, 4, 5, 0]
assert_equal [4, 5, 0], a.drop(3)
assert_equal [], a.drop(6)
end
assert("Enumerable#drop_while") do
a = [1, 2, 3, 4, 5, 0]
assert_equal [3, 4, 5, 0], a.drop_while {|i| i < 3 }
end
assert("Enumerable#take") do
a = [1, 2, 3, 4, 5, 0]
assert_equal [1, 2, 3], a.take(3)
end
assert("Enumerable#take_while") do
a = [1, 2, 3, 4, 5, 0]
assert_equal [1, 2], a.take_while {|i| i < 3}
end
assert("Enumerable#each_cons") do
a = []
(1..5).each_cons(3){|e| a << e}
assert_equal [[1, 2, 3], [2, 3, 4], [3, 4, 5]], a
end
assert("Enumerable#each_slice") do
a = []
(1..10).each_slice(3){|e| a << e}
assert_equal [[1, 2, 3], [4, 5, 6], [7, 8, 9], [10]], a
end
assert("Enumerable#group_by") do
r = (1..6).group_by {|i| i % 3 }
assert_equal [3, 6], r[0]
assert_equal [1, 4], r[1]
assert_equal [2, 5], r[2]
end
assert("Enumerable#sort_by") do
assert_equal ["car", "train", "bicycle"], %w{car bicycle train}.sort_by {|e| e.length}
end
assert("Enumerable#first") do
a = Object.new
a.extend Enumerable
def a.each
yield 1
yield 2
yield 3
end
assert_equal 1, a.first
assert_equal [1, 2], a.first(2)
assert_equal [1, 2, 3], a.first(10)
a = Object.new
a.extend Enumerable
def a.each
end
assert_nil a.first
end
assert("Enumerable#count") do
a = [1, 2, 4, 2]
assert_equal 4, a.count
assert_equal 2, a.count(2)
assert_equal 3, a.count{|x| x % 2 == 0}
end
assert("Enumerable#flat_map") do
assert_equal [1, 2, 3, 4], [1, 2, 3, 4].flat_map { |e| e }
assert_equal [1, -1, 2, -2, 3, -3, 4, -4], [1, 2, 3, 4].flat_map { |e| [e, -e] }
assert_equal [1, 2, 100, 3, 4, 100], [[1, 2], [3, 4]].flat_map { |e| e + [100] }
end
assert("Enumerable#max_by") do
assert_equal "albatross", %w[albatross dog horse].max_by { |x| x.length }
end
assert("Enumerable#min_by") do
assert_equal "dog", %w[albatross dog horse].min_by { |x| x.length }
end
assert("Enumerable#minmax") do
a = %w(albatross dog horse)
assert_equal ["albatross", "horse"], a.minmax
assert_equal ["dog", "albatross"], a.minmax { |a, b| a.length <=> b.length }
end
assert("Enumerable#minmax_by") do
assert_equal ["dog", "albatross"], %w(albatross dog horse).minmax_by { |x| x.length }
end
assert("Enumerable#none?") do
assert_true %w(ant bear cat).none? { |word| word.length == 5 }
assert_false %w(ant bear cat).none? { |word| word.length >= 4 }
assert_true [].none?
assert_true [nil, false].none?
assert_false [nil, true].none?
end
assert("Enumerable#one?") do
assert_true %w(ant bear cat).one? { |word| word.length == 4 }
assert_false %w(ant bear cat).one? { |word| word.length > 4 }
assert_false %w(ant bear cat).one? { |word| word.length < 4 }
assert_false [nil, true, 99].one?
assert_true [nil, true, false].one?
end
assert("Enumerable#each_with_object") do
assert_true [2, 4, 6, 8, 10, 12, 14, 16, 18, 20], (1..10).each_with_object([]) { |i, a| a << i*2 }
assert_raise(ArgumentError) { (1..10).each_with_object() { |i, a| a << i*2 } }
end
assert("Enumerable#reverse_each") do
r = (1..3)
a = []
assert_equal (1..3), r.reverse_each { |v| a << v }
assert_equal [3, 2, 1], a
end
assert("Enumerable#cycle") do
a = []
["a", "b", "c"].cycle(2) { |v| a << v }
assert_equal ["a", "b", "c", "a", "b", "c"], a
assert_raise(TypeError) { ["a", "b", "c"].cycle("a") { |v| a << v } }
end
assert("Enumerable#find_index") do
assert_nil (1..10).find_index { |i| i % 5 == 0 and i % 7 == 0 }
assert_equal 34, (1..100).find_index { |i| i % 5 == 0 and i % 7 == 0 }
assert_equal 49 ,(1..100).find_index(50)
end
assert("Enumerable#zip") do
a = [ 4, 5, 6 ]
b = [ 7, 8, 9 ]
assert_equal [[4, 7], [5, 8], [6, 9]], a.zip(b)
assert_equal [[1, 4, 7], [2, 5, 8], [3, 6, 9]], [1, 2, 3].zip(a, b)
assert_equal [[1, 4, 7], [2, 5, 8]], [1, 2].zip(a, b)
assert_equal [[4, 1, 8], [5, 2, nil], [6, nil, nil]], a.zip([1, 2], [8])
end
|
