ifNotNil: takes block with one argument. Why not ifNil:ifNotNil:?

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ifNotNil: takes block with one argument. Why not ifNil:ifNotNil:?

askoh
Administrator
ifNotNil: takes block with one argument. Why not ifNil:ifNotNil:? Would it be harmful to make ifNil:ifNotNil: and ifNotNil:ifNil: take blocks with one argument?

Thanks,
Aik-Siong Koh
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Re: [squeak-dev] ifNotNil: takes block with one argument. Why not ifNil:ifNotNil:?

John Thornborrow
I always use ifNotNilDo: (or ifNil:ifNotNilDo: or variant) if I need to
use a block with one argument. ifNotNil: sends valueWithPossibleArgs: so
you don't have to send a block with an argument.

askoh wrote:
> ifNotNil: takes block with one argument. Why not ifNil:ifNotNil:? Would it be
> harmful to make ifNil:ifNotNil: and ifNotNil:ifNil: take blocks with one
> argument?
>
> Thanks,
> Aik-Siong Koh

--
John Thornborrow
http://www.pinesoft.co.uk


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Re: [squeak-dev] ifNotNil: takes block with one argument. Why not ifNil:ifNotNil:?

John Thornborrow
and just to add, when I try and use a one-arg block and try to 'do' it,
I am told: " <- argument of ifNotNil: must be a 0-argument block ->"

John Thornborrow wrote:

> I always use ifNotNilDo: (or ifNil:ifNotNilDo: or variant) if I need to
> use a block with one argument. ifNotNil: sends valueWithPossibleArgs: so
> you don't have to send a block with an argument.
>
> askoh wrote:
>> ifNotNil: takes block with one argument. Why not ifNil:ifNotNil:?
>> Would it be
>> harmful to make ifNil:ifNotNil: and ifNotNil:ifNil: take blocks with one
>> argument?
>>
>> Thanks,
>> Aik-Siong Koh
>

--
John Thornborrow
http://www.pinesoft.co.uk


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Pinesoft Limited are registered in England, Registered number: 2914825. Registered office: 266-268 High Street, Waltham Cross, Herts, EN8 7EA

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Re: [squeak-dev] ifNotNil: takes block with one argument. Why not ifNil:ifNotNil:?

David T. Lewis
On Tue, Apr 29, 2008 at 11:43:44AM +0100, John Thornborrow wrote:
> >I always use ifNotNilDo: (or ifNil:ifNotNilDo: or variant) if I need to
> >use a block with one argument. ifNotNil: sends valueWithPossibleArgs: so
> >you don't have to send a block with an argument.
> >
> and just to add, when I try and use a one-arg block and try to 'do' it,
> I am told: " <- argument of ifNotNil: must be a 0-argument block ->"

This bug is documented on Mantis at http://bugs.squeak.org/view.php?id=4867

Dave