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Versions: 26
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Contents
module Enumerable
# Same as #collect but with an iteration counter.
#
# a = [1,2,3].collect_with_index { |e,i| e*i }
# a #=> [0,2,6]
#
def collect_with_index
r = []
each_index do |i|
r << yield(self[i], i)
end
r
end
alias_method( :map_with_index, :collect_with_index )
#--
# Why the term counter? There may be a change in Ruby 2.0
# to use this word instead of index. Index will
# still be used for Array, since that is the proper meaning
# in that context. In the mean time, aliases are provided.
#++
alias_method( :collect_with_counter, :collect_with_index )
alias_method( :map_with_counter, :collect_with_index )
end
# _____ _
# |_ _|__ ___| |_
# | |/ _ \/ __| __|
# | | __/\__ \ |_
# |_|\___||___/\__|
#
=begin test
require 'test/unit'
class TCEnumerable < Test::Unit::TestCase
def test_collect_with_index
a = [1,2,3].collect_with_index{ |e,i| e*i }
assert_equal( [0,2,6], a )
end
end
=end
Version data entries
26 entries across 26 versions & 1 rubygems