Classes which include Denumerable will get
versions of map, select, and so on, which return a Denumerator, so that they work horizontally
without creating intermediate arrays.
collect()
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find_all()
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map()
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13: def map
14: Denumerator.new do |output|
15: each do |*input|
16: output.yield yield(*input)
17: end
18: end
19: end
reject()
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33: def reject
34: Denumerator.new do |output|
35: each do |*input|
36: output.yield(*input) unless yield(*input)
37: end
38: end
39: end
select()
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23: def select
24: Denumerator.new do |output|
25: each do |*input|
26: output.yield(*input) if yield(*input)
27: end
28: end
29: end
skip(n)
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Skip the first n items in the list
54: def skip(n)
55: Denumerator.new do |output|
56: count = 0
57: each do |*input|
58: output.yield(*input) if count >= n
59: count += 1
60: end
61: end
62: end
take(n)
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Limit to the first n items in the list
42: def take(n)
43: Denumerator.new do |output|
44: count = 0
45: each do |*input|
46: break if count >= n
47: output.yield(*input)
48: count += 1
49: end
50: end
51: end
![[+]](./images/find.png "show/hide quicksearch")