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Line 403: Now, we can send this message to a boolean, and pass the code to be executed conditionally as a lambda block: <lang smalltalk>(a > 0) ifYouAreTrueThenDo:[ 'positive' printCR ] ifNotThenDo:[ 'negative' printCR ]</lang> actually, because these two return the value of the block ~~ethyl~~they evaluated, it can also be used for its value (in C, the ternary if expression), as in: <lang smalltalk>( (a > 0) ifYouAreTrueThenDo:['positive'] ifNotThenDo:['negative'] ) printCR</lang> Finally, by adding a self-returning "value" to the Object class, we can also write:

Category:Smalltalk: Difference between revisions

Category:Smalltalk (view source)