Procs

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    def square_of_sum(arr, my_proc) sum = arr.reduce(0, &my_proc)

    sum ** 2 end

    sum_proc = proc { |a, b| a + b } input_array = [1, 2, 3]

    result = square_of_sum(input_array, sum_proc) for more information visit this site

    When run with the input array [1, 2, 3], the output will be 36.

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