assoc-find ( ... assoc quot: ( ... key value -- ... ? ) -- ... key value ? ) (original) (raw)
Vocabulary
assocs
Inputs
| assoc | an assoc |
|---|---|
| quot | a quotation with stack effect ( ... key value -- ... ? ) |
Outputs
| key | the successful key, or f |
|---|---|
| value | the successful value, or f |
| ? | a boolean |
Word description
Applies a predicate quotation to each entry in the assoc. Returns the key and value that the quotation succeeds on, or f for both if the quotation fails. It also returns a boolean describing whether there was anything found; this can be used to distinguish between a key and a value equal to f, or nothing being found.
Definition