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| -rw-r--r-- | txr.1 | 28 |
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@@ -40012,6 +40012,34 @@ operator behaves like a failed match when the list is empty. --> ((1 2 3) (a b c)) .brev +.coNP Pattern operator @ some +.synb +.mets @(some << pattern ) +.syne +.desc +The +.code some +pattern operator requires the corresponding object to be a list. +The specified +.meta pattern +is applied against every element of the list. The match is successful if +.meta pattern +finds a matching element. + +Variables are extracted from the first matching which is found. + +.TP* Example: + +.verb + ;; the second (x 2 b) element is the leftmost one + ;; which matches the (x @a @b) pattern + + (when-match @(some (x @a @b)) + '((y 1 a) (x 2 b) (z 3 c)) + (list a b)) + -> (2 b) +.brev + .SS* Quasiquote Operator Syntax .coNP Macro @ qquote .synb |