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1.3.0 permalink

1.2.0
1.3.0

atom

Creates and returns an Atom with an initial value of x and zero or
more options (in any order):

:meta metadata-map

:validator validate-fn

If metadata-map is supplied, it will be come the metadata on the
atom. validate-fn must be nil or a side-effect-free fn of one
argument, which will be passed the intended new state on any state
change. If the new state is unacceptable, the validate-fn should
return false or throw an exception.

1 Example top

link | changes
```
user=> (def my-atom (atom 0))
#'user/my-atom

user=> @my-atom
0

user=> (swap! my-atom inc)
1

user=> @my-atom
1

user=> (swap! my-atom (fn [n] (* (+ n n) 2)))
4
```
user=> (def my-atom (atom 0)) #'user/my-atom user=> @my-atom 0 user=> (swap! my-atom inc) 1 user=> @my-atom 1 user=> (swap! my-atom (fn [n] (* (+ n n) 2))) 4

Source clojure/core.clj:2081 top

(defn atom
  "Creates and returns an Atom with an initial value of x and zero or
  more options (in any order):

  :meta metadata-map

  :validator validate-fn

  If metadata-map is supplied, it will be come the metadata on the
  atom. validate-fn must be nil or a side-effect-free fn of one
  argument, which will be passed the intended new state on any state
  change. If the new state is unacceptable, the validate-fn should
  return false or throw an exception."
  {:added "1.0"
   :static true}
  ([x] (new clojure.lang.Atom x))
  ([x & options] (setup-reference (atom x) options)))

Vars in clojure.core/atom:

Used in 0 other vars

ClojureDocs(beta)

Clojure Core

Namespaces

atom

clojure.core

1 Example top

See Also top

Source clojure/core.clj:2081 top

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