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Implement Enumerator#produce #2160

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Nov 17, 2020
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Implement Enumerator#produce #2160

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1 change: 1 addition & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ Compatibility:
* Implement `Enumerable#tally` and `Enumerable#filter_map` (#2144 and #2152, @LillianZ).
* Implement `Range#minmax`.
* Pass more `Enumerator::Lazy#uniq` and `Enumerator::Lazy#chunk` specs (#2146, @LillianZ).
* Implement `Enumerator#produce` (#2160, @zverok)

Performance:

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4 changes: 0 additions & 4 deletions spec/tags/core/enumerator/produce_tags.txt
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13 changes: 13 additions & 0 deletions src/main/ruby/truffleruby/core/enumerator.rb
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Expand Up @@ -216,6 +216,19 @@ def +(other)
Enumerator::Chain.new(self, other)
end

def self.produce(initial = nil)
# Taken from https://github.com/zverok/enumerator_generate
raise ArgumentError, 'No block given' unless block_given?
Enumerator.new(Float::INFINITY) do |y|
val = initial == nil ? yield() : initial

loop do
y << val
val = yield(val)
end
end
end

class Yielder
def initialize(&block)
raise LocalJumpError, 'Expected a block to be given' unless block_given?
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