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Ruby Enumeration interface, in reverse order
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| numbers = (1..10).to_a # array of numbers 1-10 inclusive on both ends | |
| numbers.detect {|i| i % 2 == 0} # first value divis by 2, starting from the front | |
| numbers.reverse_each.detect {|i| i % 2 == 0 } # start from the rear instead |
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