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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
199093 changed files with 3378972 additions and 0 deletions
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6
Task/Null-object/Smalltalk/null-object-1.st Normal file
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@ -0,0 +1,6 @@
object isNil ifTrue: [ "true block" ]
ifFalse: [ "false block" ].
nil isNil ifTrue: [ 'true!' displayNl ]. "output: true!"
foo isNil ifTrue: [ 'ouch' displayNl ].
x := (foo == nil).
x := foo isNil

6
Task/Null-object/Smalltalk/null-object-2.st Normal file
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@ -0,0 +1,6 @@
foo := nil.
foo class. "-> UndefinedObject"
foo respondsTo: #'bar'. "asking if a message is implemented"
foo class compile:'fancyOperation ^ 123'.
foo fancyOperation "->123"