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Contents
module Enumerable
# The block acts as an arbitrary filter on the data. Unlike map,
# it can choose to drop elements from the result and/or add
# additional elements. The first object passed to the block is
# the receiver of the output.
#
# x = (1..10000)
# x = x.filter{ |out,i| out << i if i % 2 == 0 } # like select
# x = x.filter{ |out,i| out << i + 100 } # like map
# x = x.take(3)
#
# x #=> [102, 104, 106]
#
# This is very similar to #each_with_object, but #filter handles
# argument better by reversing their order and using the splat
# operator. (This was also once known as #injecting.)
#
# CREDIT: David Black, Louis J Scoras
def filter(output=[]) #:yeild:
if block_given?
each do |*input|
yield(output, *input)
end
output
else
to_enum(:filter)
end
end
end
Version data entries
10 entries across 9 versions & 2 rubygems