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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