Hello, Let's say I write a function which checks if a given array/vector contains a certain value and returns it's index.
What should the function return if array doesn't contain the value? I read carefully the section "Nothingness and missing values": http://docs.julialang.org/en/latest/manual/faq/#nothingness-and-missing-values but I don't get from it what would be a correct "julian" solution. -- Alex
