clojure.core/coll?

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Type: function Added: Clojure 1.0 Examples: 4 Runnable: 4

([x])

Returns true if x implements IPersistentCollection

Examples

by devn on 2010-08-02 ▶

;; a map is a collection (coll? {}) ;;=> true ;; a set is a collection (coll? #{}) ;;=> true ;; a vector is a collection (coll? []) ;;=> true ;; a list is a collection (coll? '()) ;;=> true ;; a number (long) is not a collection (coll? 4) ;;=> false ;; a string is not a collection (coll? "fred") ;;=> false ;; ...but a string sequence is a collection (coll? (seq "fred")) ;;=> true ;; a boolean is not a collection (coll? true) ;;=> false ;; nil is not a collection (coll? nil) ;;=> false

by kumarshantanu on 2010-11-20 ▶

(coll? {:a 10 :b 20}) ; map is a collection of map-entries true

by gregginca on 2012-04-10 ▶

;; contrast to example code for sequential? ;; (coll? '(1 2 3)) true (coll? [1 2 3]) true (coll? (range 1 5)) true (coll? 1) false (coll? {:a 2 :b 1}) true (coll? {:a 2 :b 1}) ; in contrast to sequential?, coll? returns true for ; a hash map true (sequential? {:a 2 :b 1}) false

by Crowbrammer on 2021-01-18 ▶

;; I had major bugs before I realized `seq?` doesn't like vectors. (seq? [1 2 3]) false (coll? [1 2 3]) true

See also

• clojure.core/seq? (2)
• clojure.core/list? (2)
• clojure.core/sequential? (1)
• clojure.core/map? (1)
• clojure.core/vector? (2)
• clojure.core/set?

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