Find maxium number in a list - julia

maximum.jl

function find_maximum(array)
    global maximum

    if length(array)==0
        return maximum
    end
    if maximum<last(array)
        maximum=last(array)
    end
    println(array)
    println(last(array))
    pop!(array)
    return find_maximum(array)
end    


println(find_maximum([1,8,2,3,9,4,6,7]))