[swift-users] Looping through all values between UInt8.min and UInt8.max

[Nate Cook]

You can stride through the maximum value of a type if you land right on it:

for i in UInt8.min.stride(through: UInt8.max, by: 1) {
    print(i)
}

Nate

> On Apr 8, 2016, at 9:21 AM, Erica Sadun <erica at ericasadun.com> wrote:
> 
> 
>> On Apr 8, 2016, at 3:48 AM, tuuranton--- via swift-users <swift-users at swift.org> wrote:
>> 
>> print(UInt8.min) //0
>> 
>> print(UInt8.max) //255
>> 
>> 
>> 
>> //Is there an easy way to loop between all values
>> 
>> //between (and including both) UInt8.min and UInt8.max?
>> 
>> 
>> 
>> //This doesn't work.
>> 
>> //Runtime crash because UInt8.max has no successor.
>> 
>> for i in UInt8.min...UInt8.max {
>> 
>>     print(i)
>> 
>> }
>> 
> 
> Easy? No. 
> 
> // Range Index has no valid successor
> for i in UInt8.min ... UInt8.max {
>     print(i)
> }
> 
> // '...' cannot be applied to two 'UInt8' operands
> for i in UInt8.min ... UInt8.max as ClosedInterval {
>     print(i)
> }
> 
> // Stops at 254
> for i in UInt8.min ..< UInt8.max {
>     print(i)
> }
> 
> 
> This works, but ugh:
> 
> for i : Int in numericCast(UInt8.min)...numericCast(UInt8.max) {
>     guard let j: UInt8 = UInt8(i) else { fatalError("Nope") }
>     print(j)
> }
> 
> cc'ing in a few people to the white courtesy range phone.
> 
> -- E
> 
> 
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