conversion to string and lookup in it can't be efficient

looks like String(bool) comparison against "true"

You are amazing, my code like a kid toy nearby you code XD

but if i wanna check number with sign?:) Where's your test?

bang bang

'characters' is deprecated now !
How will it be in swift4 ?

Sorry but i dont get it, can u explain how it works?

Which is IMO the only sensible thing to do, considering that the return type isn't an optional.

What happens if you try to do
switchItUp(10)...crash!

Exactly!

What does the [number] at the end do? My guess is that it takes the input Int as an index for the array, is that correct?

thanks for the reply. I tend to write code as clean as possible so that it is understandable. I haven't had a case where I needed to optimize my code, but this should help when that day comes.

In general, less code is always better. Less to maintain, less to go wrong. Also, the compiler does some optimisation when it sees these patterns to run them in the most efficient way.

There are some rare cases where you will need to write optimised code yourself because the compiler doesn't know how to optimise them. One example I can think of is nested loops.

clever. I'm curious in general, is code more efficient during runtime when it is coded like this as opposed to a more verbose method?

either way, nice solution

You are welcome :)