On 31/10/2016 14:17, CodeDmitry wrote: > I am looking at > > ifTrue: alternativeBlock > "If the receiver is false (i.e., the condition is false), then the > value is > the > false alternative, which is nil. Otherwise answer the result of > evaluating > the argument, alternativeBlock. Create an error notification if the > receiver is nonBoolean. Execution does not actually reach here because > the expression is compiled in-line." > > self subclassResponsibility > > In order to perform the block, ifTrue must somehow end up evaluating the > block, but this code only sends a subclassResponsibility message to itself > and implicitly returns itself. > > Where does the block actually get evaluated? > >
Hi! Boolean is only an abstract class. You never manipulate a Boolean, you manipulate True or False. The #ifTrue: method works with a dispatch between True and False. Try to check: `True browse` or `False browse` :) > > > -- > View this message in context: > http://forum.world.st/How-does-Boolean-ifTrue-work-tp4920873.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > -- Cyril Ferlicot http://www.synectique.eu 2 rue Jacques Prévert 01, 59650 Villeneuve d'ascq France
signature.asc
Description: OpenPGP digital signature
