Rosetta Code Middle Three Digits

gistfile1.jl

function middle(i)
  let s = string(abs(i)) , l = length(s) , mid = int((l+1)/2)
    l < 3 ? 
        "error: not enough digits"  :
    iseven(l) ? 
        "error: number of digits is even"  :
        join((s[mid-1],s[mid],s[mid+1]))
  end
end

for n = [123, 12345, 1234567, 987654321, 10001, -10001, -123,
         -100, 100, -12345, 1, 2, -1, -10, 2002, -2002, 0]
    println (@sprintf("%10d : ",n), middle(n))
end