Category:Smalltalk: Difference between revisions
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As mentioned above, these are defined as messages and their implementation is found in the corresponding receiver classes. The following is only a tiny subset - there are virtually hundreds of uses of blocks for control structures in the system. |
As mentioned above, these are defined as messages and their implementation is found in the corresponding receiver classes. The following is only a tiny subset - there are virtually hundreds of uses of blocks for control structures in the system. |
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Typical are: |
Typical are: |
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<lang smalltalk> |
<lang smalltalk>boolean ifTrue: [ block providing value if boolean is true ] |
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boolean ifTrue: [ block providing value if boolean is true ] |
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boolean ifFalse: [ block providing value if boolean is false ] |
boolean ifFalse: [ block providing value if boolean is false ] |
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[ block for condition ] whileTrue: [ block to be looped over ] |
[ block for condition ] whileTrue: [ block to be looped over ] |
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n timesRepeat: |
n timesRepeat: [ block to be looped over ] |
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start to: stop do: [:i | block to be looped over with index ] |
start to: stop do: [:i | block to be looped over with index ] |
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collection do: [:el | block to be evaluated for each element ] |
collection do: [:el | block to be evaluated for each element ] |
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</lang> |
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collection reverseDo: [:el | block to be evaluated for each element ]</lang> |
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=== Exception Handling === |
=== Exception Handling === |
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