Category:Smalltalk: Difference between revisions
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====Block Arguments and Locals==== |
====Block Arguments and Locals==== |
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This are visible inside a block and all of its enclosed blocks. Args are specified by listing them prefixed by a colon, following a vertical bar, followed by optional local variables: |
This are visible inside a block and all of its enclosed blocks. Args are specified by listing them prefixed by a colon, following a vertical bar, followed by optional local variables: |
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<lang smalltalk>[:arg | ... code here...]. "a one-arg block" |
<lang smalltalk>[:arg | ... code here...]. "a one-arg block" |
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[:a1 :a2 :a3 | ... ] "a three-arg block" |
[:a1 :a2 :a3 | ... ] "a three-arg block" |
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[ |local1 local2| ... ] "a no-arg block with 2 locals" |
[ |local1 local2| ... ] "a no-arg block with 2 locals" |
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[:a :b :c | | l1 l2 l3 | "3 args (a,b,c) and three locals (l1,l2,l3)"</lang> |
[:a :b :c | | l1 l2 l3 | "3 args (a,b,c) and three locals (l1,l2,l3)"</lang> |
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Blocks can be nested, and inner blocks can refer to any statically visible outer scope's variable. |
Blocks can be nested, and inner blocks can refer to any statically visible outer scope's variable. |
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