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    #scala foldleft

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    #foldleft scala

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    #scala fold

    #scala reduce

    #headoption scala

    #f# fold

    #scala exists

    #scala headoption

    #fold scala

    #null in scala

    #scala null

    #scala nothing

    #scala return nothing

    #scala nil

    #fold vs reduce

    #scala fold vs reduce

    #scala reduce vs fold

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