Idiomatic way to find extreme and the next (less) extreme unique values

New to Julia
10

Can make it quite a bit faster by moving the second if statement into the first

function twoextremas_loop2(a)
    mn,min2 = Inf,Inf
    mx,max2 = -Inf,-Inf
    for item ∈ a
        if item < mn
            min2 = mn
            mn = item
        elseif item < min2
            min2 = item
        else
            if item > mx
                max2 = mx
                mx = item
            elseif item > max2
                max2 = item
            end
        end
    end
    return (mn,mx),(min2,max2)
end


julia> @btime twoextremas($a)
  12.151 ms (2 allocations: 7.63 MiB)
((-4.722967184880966, 5.913947095464424), (-4.448884781343994, 4.541658686526455))

julia> @btime twoextremas_loop($a)
  1.469 ms (0 allocations: 0 bytes)
((-4.722967184880966, 5.913947095464424), (-4.448884781343994, 4.541658686526455))

julia> @btime twoextremas_loop2($a)
  992.839 μs (0 allocations: 0 bytes)
((-4.722967184880966, 5.913947095464424), (-4.448884781343994, 4.541658686526455))
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