clojure.core/isa?

View this page on ClojureDocs

Type: function Added: Clojure 1.0 Examples: 3 Runnable: 2

([child parent] [h child parent])

Returns true if (= child parent), or child is directly or indirectly derived from parent, either via a Java type inheritance relationship or a relationship established via derive. h must be a hierarchy obtained from make-hierarchy, if not supplied defaults to the global hierarchy

Examples

by OnesimusUnbound on 2011-08-03 . May have evaluation errors. ▶

(import 'java.util.PriorityQueue) java.util.PriorityQueue (bases PriorityQueue) (java.util.AbstractQueue java.io.Serializable) (import 'java.util.AbstractQueue) java.util.AbstractQueue (isa? PriorityQueue AbstractQueue) true (bases AbstractQueue) (java.util.AbstractCollection java.util.Queue) (isa? PriorityQueue java.util.AbstractCollection) true (isa? PriorityQueue java.util.Queue) true (isa? java.util.PriorityQueue java.util.TreeMap) false

by OnesimusUnbound on 2011-08-10 ▶

(derive ::Feline ::Animal) nil (derive ::Cat ::Feline) nil (derive ::Lion ::Feline) nil (isa? ::Lion ::Feline) true (isa? ::Lion ::Animal) true (isa? ::Tuna ::Feline) false

by jbswetnam on 2018-06-25 ▶

;; you can use vectors to test multiple child/parent pairs (derive ::child-1 ::parent-1) nil (derive ::child-2 ::parent-2) nil (isa? [::child-1 ::child-2] [::parent-1 ::parent-2]) true

See also

• clojure.core/derive (3)
• clojure.core/instance? (0)
• clojure.core/underive
• clojure.core/ancestors (1)
• clojure.core/parents (1)
• clojure.core/descendants (1)
• clojure.core/make-hierarchy (0)

---

Content from the matching ClojureDocs page, with authors credited on each contribution.