clojure.core/struct

View this page on ClojureDocs

Type: function Added: Clojure 1.0 Examples: 2 Runnable: 1

([s & vals])

Returns a new structmap instance with the keys of the structure-basis. vals must be supplied for basis keys in order - where values are not supplied they will default to nil.

Examples

by dakrone on 2010-12-30 . May have evaluation errors. ▶

(defstruct mystruct :foo :bar) #'user/mystruct (struct mystruct "eggplant" "pizza") {:foo "eggplant", :bar "pizza"}

by metasoarous on 2020-11-17 ▶

;; You can use an "anonymous" struct like so (let [structure (create-struct :foo :bar)] (struct structure "pop" "fizz")) ;; This can be useful if you want to dynamically create/use structs, and don't ;; know the field names at compile time (e.g. when reading CSV files)

Note by Dimagog

Structs are becoming obsolete. Use records instead. See defrecord.

Note by metasoarous

In general, records should be preferred over structs. However, structs aren't entirely obsolete.

They can still be useful when you need/want to create record-like objects dynamically; That is, when you don't know the field names at compile time. A typical example of this might be loading rows from a CSV (as semantic-csv does). The advantage in this case over using regular maps is significantly improved performance creating and using these objects.

See also

• clojure.core/defstruct
• clojure.core/create-struct

---

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