alength

function/macro

since v0.0-927

clojure.core/alength

(alength array)

Details:

For interop, it returns the length of a JavaScript array or string.

Examples:

(def a #js [1 2 3])

(alength a)
;;=> 3

(.-length a)
;;=> 3

(aget a "length")
;;=> 3

(count a)
;;=> 3

See Also:

count

Source docstring:

Returns the length of the array. Works on arrays of all types.

Function code @ clojurescript:src/main/cljs/cljs/core.cljs

(defn ^number alength
  [array]
  (cljs.core/alength array))

Macro code @ clojurescript:src/main/clojure/cljs/core.cljc

(core/defmacro alength [a]
  (vary-meta
    (core/list 'js* "~{}.length" a)
    assoc :tag 'number))