#!/usr/bin/env ruby module Enumerable # Reduce has been added to the Ruby 1.7 library def reduce(init) result = init each { |item| result = yield(item, result) } result end end puts [1,2,3,4].reduce(0) { |n, sum| n + sum } puts [1,2,3,4].reduce(1) { |n, prod| n * prod } |
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