?? 08 - summing each item of an array.rb
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collection = [1, 2, 3, 4, 5]sum = 0collection.each {|i| sum += i}sum # => 15#---collection = [1, 2, 3, 4, 5]collection.inject(0) {|sum, i| sum + i} # => 15#---collection = [1, 2, 3, 4, 5]sum = 0sum = sum + 1sum = sum + 2sum = sum + 3sum = sum + 4sum = sum + 5#---collection = [1, 2, 3, 4, 5]collection.inject(1) {|total, i| total * i} # => 120#---?? 快捷鍵說明
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