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JoshCheek/yield_while.rb

Created March 23, 2015 05:08
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Example of a language construct I keep finding myself wanting.
Raw
yield_while.rb
def yield_while(&block)
Enumerator.new do |y|
while value = block.call
y.yield value
end
end
end
require 'stringio'
stream = StringIO.new "abc\ndef\nghi\n"
yield_while { stream.gets }.each { |line| puts line }
# >> abc
# >> def
# >> ghi
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