Set>>add:
Nevin Pratt
nevin at smalltalkpro.com
Tue Nov 12 22:58:40 UTC 2002
Richard A. O'Keefe wrote:
>Note that changing Set to quietly *ignore* attempts to add: nil
>would come very close to preventing a change that made add: nil
>work "as expected". What do the other Smalltalks mentioned actually
>DO when you add: nil to a Set? Do they add it, or do they just lie?
>
>
>
>
>
Here's the VisualWorks implementation of Set>>add:
add: newObject
"Include newObject as one of the receiver's elements. Answer
newObject."
| index |
newObject == nil ifTrue: [^newObject].
index := self findElementOrNil: newObject.
(self basicAt: index) == nil ifTrue: [self atNewIndex: index put:
newObject].
^newObject
Nevin
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