[swift-users] Cleaner way than if let initialization?

[Erica Sadun]

And Greg from Omni Group has an even better solution for you.  Since DateFormatter inherits from Formatter, you can use its `string(for:)` which accepts optionals:

let dobString3 = serverDateFormatter.string(for:dob) ?? ""

-- E

> On Aug 4, 2016, at 3:17 PM, Erica Sadun via swift-users <swift-users at swift.org> wrote:
> 
>> 
>> On Aug 4, 2016, at 1:41 PM, Tim Vermeulen via swift-users <swift-users at swift.org <mailto:swift-users at swift.org>> wrote:
>> 
>> You want `flatMap`:
>> 
>> let dobString = dob.flatMap(serverDateFormatter.stringFromDate)
>> 
>> Or if you want `dobString` to be non-optional:
>> 
>> let dobString = dob.flatMap(serverDateFormatter.stringFromDate) ?? “"
> 
> You can just use map here too, right?
> 
> let dobString2: String = dob.map(serverDateFormatter.string) ?? ""
> 
> I was a little surprised that this didn't need the rest of the selector signature but that's because parameter stripping and type matching, isn't it?
> 
>> 
>>> Currently I do stuff like this:
>>> 
>>> letdobString:String
>>> ifletdob = dob {
>>> dobString =serverDateFormatter.stringFromDate(dob)
>>> }
>>> else{
>>> dobString =""
>>> }
>>> 
>>> Is there a better, more idiomatic, way to do this sort of thing?
>>> 
>>> 
>>> 
>>> 
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> 
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