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Contents
#--
# Credit goes to Florian Gross.
#++
module Enumerable
# Collects/Maps and filters items out in one single step.
# You can use throw(:skip) in the supplied block to indicate that the
# current item should not end up in the resulting array.
#
# # Return names of all person with an age of at least 18.
# persons.filter_collect do |person|
# throw(:skip) if person.age < 18
# person.name
# end
#
# Also see Enumerable#collect, Enumerable#find_all.
#
def filter_collect #:yield:
result = []
self.each do |item|
catch(:skip) do
new_item = yield(item)
result << new_item
end
end
return result
end
alias_method :filter_map, :filter_collect
end #Enumerable
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCEnumerable < Test::Unit::TestCase
def test_filter_collect
e = [3,4]
a = [1,2,3,4].filter_collect { |n|
throw(:skip) if n < 3
n
}
assert_equal( e, a )
end
end
=end
Version data entries
26 entries across 26 versions & 1 rubygems