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In-place map_with_index (See related posts)

// This code is similar to Enumerable#map, but like each_with_index, it also yields the index of the current element.

class Array
    def map_with_index!
       each_with_index do |e, idx| self[idx] = yield(e, idx); end
    end

    def map_with_index(&block)
        dup.map_with_index!(&block)
    end
end
to ruby array map by vinterbleg on Fri Feb 08 05:29:44 -0500 2008

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