[ANSI-Smalltalk] Re: A list of interesting methods, ifNotNil:

[Richard A. O'Keefe]

On 5 Sep 2008, at 5:33 pm, Paolo Bonzini wrote:
> I'll just point out that #ifNotEmptyDo:, for me is a shortcut for
>
>   x isEmpty ifTrue: [ x do: monadicBlock ]
>
> which is a good reason for supporting bi-arity instead of overloading
> the meaning of "do".

I am now confused.
The actual code in Squeak is

	ifNotEmptyDo: aBlock
	    ^self isEmpty ifTrue: [aBlock value: self]

It certainly doesn't involve any sending of the message #do:.

x isEmpty ifTrue: [x do: monadicBlock]

would, if x is a collection, never do anything at all with monadicBlock.
I take it that this should have been

x isEmpty ifFalse: [x do: monadicBlock]

and there is a name for that too:  #do:.

VisualWorks also has an if*Do: method or two.
GeneralBindingReference>>ifDefinedDo:
has nothing to do with #do:.
WindowManager>>activeControllerProcessIfBlockedDo:
also has nothing to do with #do:.