Hi guys. If I tell you the selector is Dictionary >> #at:ifAbsentPut: what
would you expect the second parameter to be? the value.
So, one would do:
Dictionary new at: #foo ifAbsentPut: 4
But if you see Dictionary >>
at: key ifAbsentPut: aBlock
"Return the value at the given key.
If key is not included in the receiver store the result
of evaluating aBlock as new value."
^ self at: key ifAbsent: [self at: key put: aBlock value]
so it expects a Block. Ok, we are in Smalltalk, so implementing #value is
enough.
Well..the previous example works, but only because we have an ugly Object >>
value that returns self.
If I put instances of subclasses from ProtoObjects (proxies), that do not
work anymore.
So...my question is we do Dictionary at: #foo put: 4, why #at:ifAbsentPut:
expects a block and not directly the value?
in which case I need a block instead of the value object directly ?
thanks
--
Mariano
http://marianopeck.wordpress.com
