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Contents
module Enumerable
# A versitle compaction method. Like #map but used
# to filter out multiple items in a single step.
#
# Without +trash+ arguments +nil+ is assumed.
#
# [1, nil, 2].purge #=> [1,2]
#
# If +trash+ arguments are given, each argument is
# compared for a match using #==.
#
# (1..6).purge(3,4) #=> [1,2,5,6]
#
# If a block is given, the yield is used in the
# matching condition instead of the element itsef.
#
# (1..6).purge(0){ |n| n % 2 } #=> [1,3,5]
#
# NOTE: This could just as well be an override of the
# core #compact method, but to avoid potential issues
# associated with overriding core methods we use the
# alternate name #purge.
#
# CREDIT: Trans
def purge(*trash, &block)
trash = [nil] if trash.empty?
r = []
if block_given?
each do |e|
y = yield(e)
r << e unless trash.any?{|t| t == y}
end
else
each do |e|
r << e unless trash.any?{|t| t == e}
end
end
r
end
end
Version data entries
13 entries across 12 versions & 2 rubygems