Re: [swift-users] Using defer in Swift Playgrounds

[Joe DeCapo via swift-users]

Here's the JIRA: https://bugs.swift.org/browse/SR-5641

Thanks again!
-Joe

> On Aug 7, 2017, at 3:33 PM, Joe DeCapo via swift-users 
>  wrote:
> 
> Ok, cool. Thanks for the response. I'll file it in the Swift bug tracker.
> 
>> On Aug 7, 2017, at 3:23 PM, Jordan Rose  wrote:
>> 
>> Either way is fine. I suspect this is a bug with the transformation the 
>> Swift compiler performs when compiling for a playground, rather than with 
>> the machinery that goes with running the playground, but I haven’t looked 
>> into it.
>> 
>> Jordan
>> 
>> 
>>> On Aug 7, 2017, at 13:22, Joe DeCapo  wrote:
>>> 
>>> Since it's Playground bug, should I file it in Apple's bug reporter rather 
>>> than Swift's?
>>> 
 On Aug 7, 2017, at 3:12 PM, Jordan Rose  wrote:
 
 I’d say that’s a bug! Mind filing it at https://bugs.swift.org ?
 
 Thanks,
 Jordan
 
> On Aug 4, 2017, at 12:41, Joe DeCapo via swift-users 
>  wrote:
> 
> Hi everyone,
> 
> I'm not sure if there's a more appropriate place to ask this question, 
> but I figured at the very least I could get pointed in the right 
> direction. I've tried searching online and haven't been able to find 
> anything addressing this.
> 
> I was trying to use the `defer` statement in a Playground, and was 
> surprised to find that it never prints anything in the preview pane on 
> the side. I was expecting the evaluation of the code in the `defer` 
> statement to show up in line with the statements, even though they're 
> executed after the last line in the function. I made a very simple 
> playground that modifies a global variable and prints the value in the 
> `defer` statement, and when I print the global variable after calling my 
> function it shows the correct updated value, so the code in the `defer` 
> statement is getting run as expected. Here's my sample code with the 
> Playground output in comments on the side:
> 
> var x = 3 // 3
> func doSomething() {
> print(1)  // "1\n"
> defer {
>x += 1
>print(x)
> }
> print(2)  // "2\n"
> }
> doSomething()
> print(x)  // "4\n"
> 
> I was expecting something like this:
> 
> var x = 3 // 3
> func doSomething() {
> print(1)  // "1\n"
> defer {
>x += 1 // 4
>print(x)   // "4\n"
> }
> print(2)  // "2\n"
> }
> doSomething()
> print(x)  // "4\n"
> 
> Is there some deep reason why code in `defer` statements doesn't show 
> anything in the preview pane in Playgrounds?
> 
> -Joe
> 
> 
> 
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>>> 
>> 
> 
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Re: [swift-users] Using defer in Swift Playgrounds

[Joe DeCapo via swift-users]

Ok, cool. Thanks for the response. I'll file it in the Swift bug tracker.

> On Aug 7, 2017, at 3:23 PM, Jordan Rose  wrote:
> 
> Either way is fine. I suspect this is a bug with the transformation the Swift 
> compiler performs when compiling for a playground, rather than with the 
> machinery that goes with running the playground, but I haven’t looked into it.
> 
> Jordan
> 
> 
>> On Aug 7, 2017, at 13:22, Joe DeCapo  wrote:
>> 
>> Since it's Playground bug, should I file it in Apple's bug reporter rather 
>> than Swift's?
>> 
>>> On Aug 7, 2017, at 3:12 PM, Jordan Rose  wrote:
>>> 
>>> I’d say that’s a bug! Mind filing it at https://bugs.swift.org ?
>>> 
>>> Thanks,
>>> Jordan
>>> 
 On Aug 4, 2017, at 12:41, Joe DeCapo via swift-users 
  wrote:
 
 Hi everyone,
 
 I'm not sure if there's a more appropriate place to ask this question, but 
 I figured at the very least I could get pointed in the right direction. 
 I've tried searching online and haven't been able to find anything 
 addressing this.
 
 I was trying to use the `defer` statement in a Playground, and was 
 surprised to find that it never prints anything in the preview pane on the 
 side. I was expecting the evaluation of the code in the `defer` statement 
 to show up in line with the statements, even though they're executed after 
 the last line in the function. I made a very simple playground that 
 modifies a global variable and prints the value in the `defer` statement, 
 and when I print the global variable after calling my function it shows 
 the correct updated value, so the code in the `defer` statement is getting 
 run as expected. Here's my sample code with the Playground output in 
 comments on the side:
 
 var x = 3  // 3
 func doSomething() {
 print(1)   // "1\n"
 defer {
 x += 1
 print(x)
 }
 print(2)   // "2\n"
 }
 doSomething()
 print(x)   // "4\n"
 
 I was expecting something like this:
 
 var x = 3  // 3
 func doSomething() {
 print(1)   // "1\n"
 defer {
 x += 1 // 4
 print(x)   // "4\n"
 }
 print(2)   // "2\n"
 }
 doSomething()
 print(x)   // "4\n"
 
 Is there some deep reason why code in `defer` statements doesn't show 
 anything in the preview pane in Playgrounds?
 
 -Joe
 
 
 
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 swift-users mailing list
 swift-users@swift.org
 https://lists.swift.org/mailman/listinfo/swift-users
>>> 
>> 
> 

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Re: [swift-users] Using defer in Swift Playgrounds

[Jordan Rose via swift-users]

Either way is fine. I suspect this is a bug with the transformation the Swift 
compiler performs when compiling for a playground, rather than with the 
machinery that goes with running the playground, but I haven’t looked into it.

Jordan


> On Aug 7, 2017, at 13:22, Joe DeCapo  wrote:
> 
> Since it's Playground bug, should I file it in Apple's bug reporter rather 
> than Swift's?
> 
>> On Aug 7, 2017, at 3:12 PM, Jordan Rose  wrote:
>> 
>> I’d say that’s a bug! Mind filing it at https://bugs.swift.org ?
>> 
>> Thanks,
>> Jordan
>> 
>>> On Aug 4, 2017, at 12:41, Joe DeCapo via swift-users 
>>>  wrote:
>>> 
>>> Hi everyone,
>>> 
>>> I'm not sure if there's a more appropriate place to ask this question, but 
>>> I figured at the very least I could get pointed in the right direction. 
>>> I've tried searching online and haven't been able to find anything 
>>> addressing this.
>>> 
>>> I was trying to use the `defer` statement in a Playground, and was 
>>> surprised to find that it never prints anything in the preview pane on the 
>>> side. I was expecting the evaluation of the code in the `defer` statement 
>>> to show up in line with the statements, even though they're executed after 
>>> the last line in the function. I made a very simple playground that 
>>> modifies a global variable and prints the value in the `defer` statement, 
>>> and when I print the global variable after calling my function it shows the 
>>> correct updated value, so the code in the `defer` statement is getting run 
>>> as expected. Here's my sample code with the Playground output in comments 
>>> on the side:
>>> 
>>> var x = 3   // 3
>>> func doSomething() {
>>>  print(1)   // "1\n"
>>>  defer {
>>>  x += 1
>>>  print(x)
>>>  }
>>>  print(2)   // "2\n"
>>> }
>>> doSomething()
>>> print(x)// "4\n"
>>> 
>>> I was expecting something like this:
>>> 
>>> var x = 3   // 3
>>> func doSomething() {
>>>  print(1)   // "1\n"
>>>  defer {
>>>  x += 1 // 4
>>>  print(x)   // "4\n"
>>>  }
>>>  print(2)   // "2\n"
>>> }
>>> doSomething()
>>> print(x)// "4\n"
>>> 
>>> Is there some deep reason why code in `defer` statements doesn't show 
>>> anything in the preview pane in Playgrounds?
>>> 
>>> -Joe
>>> 
>>> 
>>> 
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>>> swift-users@swift.org
>>> https://lists.swift.org/mailman/listinfo/swift-users
>> 
> 

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Re: [swift-users] Using defer in Swift Playgrounds

[Joe DeCapo via swift-users]

Since it's Playground bug, should I file it in Apple's bug reporter rather than 
Swift's?

> On Aug 7, 2017, at 3:12 PM, Jordan Rose  wrote:
> 
> I’d say that’s a bug! Mind filing it at https://bugs.swift.org ?
> 
> Thanks,
> Jordan
> 
>> On Aug 4, 2017, at 12:41, Joe DeCapo via swift-users  
>> wrote:
>> 
>> Hi everyone,
>> 
>> I'm not sure if there's a more appropriate place to ask this question, but I 
>> figured at the very least I could get pointed in the right direction. I've 
>> tried searching online and haven't been able to find anything addressing 
>> this.
>> 
>> I was trying to use the `defer` statement in a Playground, and was surprised 
>> to find that it never prints anything in the preview pane on the side. I was 
>> expecting the evaluation of the code in the `defer` statement to show up in 
>> line with the statements, even though they're executed after the last line 
>> in the function. I made a very simple playground that modifies a global 
>> variable and prints the value in the `defer` statement, and when I print the 
>> global variable after calling my function it shows the correct updated 
>> value, so the code in the `defer` statement is getting run as expected. 
>> Here's my sample code with the Playground output in comments on the side:
>> 
>> var x = 3// 3
>> func doSomething() {
>>   print(1)   // "1\n"
>>   defer {
>>   x += 1
>>   print(x)
>>   }
>>   print(2)   // "2\n"
>> }
>> doSomething()
>> print(x) // "4\n"
>> 
>> I was expecting something like this:
>> 
>> var x = 3// 3
>> func doSomething() {
>>   print(1)   // "1\n"
>>   defer {
>>   x += 1 // 4
>>   print(x)   // "4\n"
>>   }
>>   print(2)   // "2\n"
>> }
>> doSomething()
>> print(x) // "4\n"
>> 
>> Is there some deep reason why code in `defer` statements doesn't show 
>> anything in the preview pane in Playgrounds?
>> 
>> -Joe
>> 
>> 
>> 
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>> swift-users@swift.org
>> https://lists.swift.org/mailman/listinfo/swift-users
> 

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Re: [swift-users] Using defer in Swift Playgrounds

[Jordan Rose via swift-users]

I’d say that’s a bug! Mind filing it at https://bugs.swift.org 
 ?

Thanks,
Jordan

> On Aug 4, 2017, at 12:41, Joe DeCapo via swift-users  
> wrote:
> 
> Hi everyone,
> 
> I'm not sure if there's a more appropriate place to ask this question, but I 
> figured at the very least I could get pointed in the right direction. I've 
> tried searching online and haven't been able to find anything addressing this.
> 
> I was trying to use the `defer` statement in a Playground, and was surprised 
> to find that it never prints anything in the preview pane on the side. I was 
> expecting the evaluation of the code in the `defer` statement to show up in 
> line with the statements, even though they're executed after the last line in 
> the function. I made a very simple playground that modifies a global variable 
> and prints the value in the `defer` statement, and when I print the global 
> variable after calling my function it shows the correct updated value, so the 
> code in the `defer` statement is getting run as expected. Here's my sample 
> code with the Playground output in comments on the side:
> 
> var x = 3 // 3
> func doSomething() {
>   print(1)// "1\n"
>   defer {
>   x += 1
>   print(x)
>   }
>   print(2)// "2\n"
> }
> doSomething()
> print(x)  // "4\n"
> 
> I was expecting something like this:
> 
> var x = 3 // 3
> func doSomething() {
>   print(1)// "1\n"
>   defer {
>   x += 1  // 4
>   print(x)// "4\n"
>   }
>   print(2)// "2\n"
> }
> doSomething()
> print(x)  // "4\n"
> 
> Is there some deep reason why code in `defer` statements doesn't show 
> anything in the preview pane in Playgrounds?
> 
> -Joe
> 
> 
> 
> ___
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> swift-users@swift.org
> https://lists.swift.org/mailman/listinfo/swift-users

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