alt
- (alt & key-pred-forms)
Takes key+pred pairs, e.g. (s/alt :even even? :small #(< % 42)) Returns a regex op that returns a map entry containing the key of the first matching pred and the corresponding value. Thus the 'key' and 'val' functions can be used to refer generically to the components of the tagged return
© Rich Hickey. All rights reserved. Eclipse Public License 1.0
2 Examples
(require '[clojure.spec.alpha :as s]) (let [spec (s/alt :n number? :b boolean?)] [(s/conform spec [1]) (s/conform spec [true]) (s/conform spec ["str"])]) ;; => [[:n 1] [:b true] :clojure.spec.alpha/invalid]
(require '[clojure.spec.alpha :as s]) (s/def ::type-hinted-destructure (s/* (s/alt :hinted (s/cat :symbol symbol? :separator #(= :- %) :schema any?) :not-hinted (s/cat :symbol symbol?)))) (s/conform ::type-hinted-destructure '[first :- string? ; `first :- string?` not `[first :- string?]` last]) ;; [[:hinted {:symbol first, :separator :-, :schema string?}] [:not-hinted {:symbol last}]]