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# encoding: utf-8
require 'open_classes/object'
require 'open_classes/module'
require 'open_classes/array/together_helper'
# Array
class Array
include TogetherHelper
# Arrays loop together reduce.
#
# together_reduce has aliases [:treduce, :together_inject, :tinject]
#
# if you want to single return
# firsts = [1, 2, 3, 4]
# seconds = [4, 2, 3, 1]
# ret = [firsts, seconds].together_reduce{|memo, first, second|memo + first + second}
# print ret # => output 20
#
# if you want to single return with init value
# firsts = [1, 2, 3, 4]
# seconds = [4, 2, 3, 1]
# ret = [firsts, seconds].together_reduce(10){|memo, first, second|memo + first + second}
# print ret # => output 30
#
# if you want to single return with init string value
# firsts = %w{a b c}
# seconds = %w{1 2 3}
# ret = [firsts, seconds].together_reduce('start-'){|memo, first, second|memo + first + second}
# print ret # => output 'start-a1b2c3'
#
# if you want to single return with init Array value
# firsts = [1, 2, 3, 4]
# seconds = [4, 2, 3, 1]
# ret = [firsts, seconds].together_reduce([]){|memo, first, second|memo << first + second}
# print ret # => output [5, 4, 6, 5]
#
# if you want to single return with init Hash value
# firsts = [1, 2, 3, 4]
# seconds = [4, 2, 3, 1]
# ret = [firsts, seconds].together_reduce({}){|memo, first, second|memo[first] = second;memo}
# print ret # => output {1=>4, 2=>2, 3=>3, 4=>1}
def together_reduce(init = nil)
if_not_contain_array_rails_type_error
memo = initial_memo init
first.each_with_index do |i_v, i|
eval_each_str = get_args_str_for_together i
memo = instance_eval "yield(memo, #{eval_each_str})"
end
memo
end
def initial_memo(init)
return init unless init.nil?
first.first.is_a?(Numeric) ? 0 : first.first.is_a?(String) ? '' : nil
end
alias_methods [:together_inject, :treduce, :tinject], :together_reduce
end
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115 entries across 115 versions & 1 rubygems