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Contents
module PropCheck
##
# Helper functions that have no other place to live
module Helper
extend self
##
# Creates a (potentially lazy) Enumerator
# starting with `elem`
# with each consecutive element obtained
# by calling `operation` on the previous element.
#
# >> Helper.scanl(0, &:next).take(10).force
# => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
# >> Helper.scanl([0, 1]) { |curr, next_elem| [next_elem, curr + next_elem] }.map(&:first).take(10).force
# => [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]
def scanl(elem, &operation)
Enumerator.new do |yielder|
acc = elem
loop do
# p acc
yielder << acc
acc = operation.call(acc)
end
end.lazy
end
end
end
Version data entries
8 entries across 8 versions & 1 rubygems