Michael Tsai on Twitter: "@jimcorreia For yes/no/error or yes/no/not-computed-yet."

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Greg Titus ‏@gregtitus 3 Jun 2014

var x : Bool? x = false if x {} // true if x! {} // false if x? {} // ???true we expected "x?" to be "x && x!" it seems to be just "x"?
1 retweet 2 likes
Jim Correia ‏@jimcorreia 3 Jun 2014

@gregtitus Not that this isn’t an interesting question, but is there a practical use for a Bool? variable/argument that isn’t obvious?
Greg Titus ‏@gregtitus 3 Jun 2014

@jimcorreia Well, if you have a method that returns Bool…   var data : NSData? let result = data?.writeToFile(path) result is Bool?
Curt Clifton ‏@curtclifton 3 Jun 2014

@gregtitus @jimcorreia preferred idiom is probably: if let result = data?.writeToFile(path) { … }
Jim Correia ‏@jimcorreia 3 Jun 2014

@curtclifton @gregtitus I've come up with a possibly legit use of a Bool? argument, but I'm still not sold for return values.

‏@mjtsai

@jimcorreia For yes/no/error or yes/no/not-computed-yet.

9:00 PM - 3 Jun 2014

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