Category:Smalltalk: Difference between revisions
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=== Return from a Block === |
=== Return from a Block === |
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it should be noted that a "ˆ" (return) inside a block will return from the enclosing method, NOT only from the block. And that this is an essential semantic property of the return (technically, it may be a long return from a deeply nested call hierarchy, possibly involving unwind actions). |
it should be noted that a " ˆ " (return) inside a block will return from the enclosing method, NOT only from the block. And that this is an essential semantic property of the return (technically, it may be a long return from a deeply nested call hierarchy, possibly involving unwind actions). |
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This makes it possible to pass a block to eg. collections to enumerate elements up-to and until some condition is met. For example, if we need a helper method, which searches the first element in a dataset to some condition and evaluate an action on it, we can write: |
This makes it possible to pass a block to eg. collections to enumerate elements up-to and until some condition is met. For example, if we need a helper method, which searches the first element in a dataset to some condition and evaluate an action on it, we can write: |
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