Changing the subject to capture Levente's interesting idea of extending
the functionality of caseOf: by passing the receiver object to the case
blocks as a parameter. This idea seems good enough to deserve its own
subject line.

Dave

On Sun, Mar 28, 2021 at 10:33:32AM +0200, Levente Uzonyi wrote:
> Hi Christoph,
> 
> I see some value having #identityCaseOf:, so +1 from me.
> 
> But what would be a more interesting thing to explore (yes, I'm derailing 
> this conversation now because the answer to your question is yes already 
> :)) is to extend the functionality of #caseOf:.
> 
> For example, passing the object to the condition block (or even the result 
> block) could be useful:
> 
> self someComplexExpression caseOf: {
> 	[ 1 ] -> [ self success ]
> 	[ :value | value odd ] -> [ :value | self processEvenValue: value - 
> 	1 ].
> 	[ :value | true "it's even ] -> [ :value | self processEvenValue ] }
> 
> There are two new things in the example:
> - the value of self someComplexExpression is optionally passed to the 
> blocks. Yes, that could be done by creating a temporary variable. The 
> compiler could do exactly that behind the scenes.
> - when the value is passed to the matcher block, possibilities are greatly 
> extended. For example, it could even reproduce #identityCaseOf:
> 
> 	foo caseOf: {
> 		[ :o | o == #foo ] -> [ self foo ].
> 		[ :o | o == #bar ] -> [ self bar ] }
> 
> The same thing could be done with the otherwise block too:
> 
> 	self foo
> 		caseOf: { ... }
> 		otherwise: [ :value | value ]
> 
> 
> Levente
>