Re: [swift-users] How to write better Swift

[Gerriet M. Denkmann via swift-users]

> On 10 Jul 2017, at 22:35, Geordie J via swift-users  
> wrote:
> 
> Would “didSet" on a normal variable work for you?

willSet/didSet usually is a good solution (which I had forgotten about).

But in my case it seems not to help - see the corrected code below

> var status: Int {
>  didSet { doSomething() }
> }
> 
> Geordie
> 
> 
>> Am 10.07.2017 um 17:34 schrieb Gerriet M. Denkmann via swift-users 
>> :
>> 
>> This works (Xcode Version 8.3.2 (8E2002)):
>> 
>> class SomeClass
>> {
>>  private var privateStatus: Int  
>> 
>>  var status: Int
>>  {
>>  get{ return privateStatus }
>>  set(new)
>>  {
>>  if new == privateStatus {return}

oldDerived = derivedStatus // depends on status
privateStatus = new
newDerived = derivedStatus 

if newDerived != oldDerived … do something … 

… do something more here …
>>  }
>>  }
>> }
>> 
>> But is this “privateStatus” really necessary?
>> If not, how can it be avoided?


Quincey had an excellent idea: one should be able to write:

var status: Int
{
var privateStatus: Int  //  makes it much clearer that 
privateStatus really only belongs to status

get{ return privateStatus }
set(new)
{
…
privateStatus = new
}
}

Gerriet.

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Re: [swift-users] How to write better Swift

[Adrian Zubarev via swift-users]

It should be willSet because in the example the job is executed before the new 
value is set.

class SomeClass {

var status: Int {
willSet {
guard newValue != self.status { return }
// do something here
}
}
}


-- 
Adrian Zubarev
Sent with Airmail

Am 10. Juli 2017 um 17:35:34, Geordie J via swift-users (swift-users@swift.org) 
schrieb:

Would "didSet" on a normal variable work for you?

var status: Int {
didSet { doSomething() }
}

Geordie


> Am 10.07.2017 um 17:34 schrieb Gerriet M. Denkmann via swift-users 
> :
>  
> This works (Xcode Version 8.3.2 (8E2002)):
>  
> class SomeClass
> {
> private var privateStatus: Int
>  
> var status: Int
> {
> get{ return privateStatus }
> set(new)
> {
> if new == privateStatus {return}
>  
> … do something here …
>  
> privateStatus = new
> }
> }
> }
>  
> But is this “privateStatus” really necessary?
> If not, how can it be avoided?
>  
> Gerriet.
>  
> ___
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> swift-users@swift.org
> https://lists.swift.org/mailman/listinfo/swift-users

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Re: [swift-users] How to write better Swift

[Geordie J via swift-users]

Would "didSet" on a normal variable work for you?

var status: Int {
  didSet { doSomething() }
}

Geordie


> Am 10.07.2017 um 17:34 schrieb Gerriet M. Denkmann via swift-users 
> :
> 
> This works (Xcode Version 8.3.2 (8E2002)):
> 
> class SomeClass
> {
>   private var privateStatus: Int  
> 
>   var status: Int
>   {
>   get{ return privateStatus }
>   set(new)
>   {
>   if new == privateStatus {return}
>   
>   … do something here …
> 
>   privateStatus = new
>   }
>   }
> }
> 
> But is this “privateStatus” really necessary?
> If not, how can it be avoided?
> 
> Gerriet.
> 
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> swift-users@swift.org
> https://lists.swift.org/mailman/listinfo/swift-users

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[swift-users] How to write better Swift

[Gerriet M. Denkmann via swift-users]

This works (Xcode Version 8.3.2 (8E2002)):

class SomeClass
{
private var privateStatus: Int  

var status: Int
{
get{ return privateStatus }
set(new)
{
if new == privateStatus {return}

… do something here …

privateStatus = new
}
}
}

But is this “privateStatus” really necessary?
If not, how can it be avoided?

Gerriet.

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