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iOS Swift Functions and Optionals Optionals Exercise: isDivisible function

Why use nil and use a optional bool when we could just say it was false?

I don't get it.

2 Answers

Rafael Schwemmer
Rafael Schwemmer
6,108 Points

I think it was just for the sake of practicing optional return types. Otherwise I also would have written that function much simpler like this:

func isDivisible(#dividend: Int, #divisor: Int) -> Bool {
    return dividend % divisor == 0

Then you could do this:

if isDivisible(dividend: 20, divisor: 2) {
else {
    println("not divisble")
Szymon Kadłuczka
Szymon Kadłuczka
8,762 Points

In this case it doesn't matter, but the whole point of the video was to acquaint you with the general idea :-)