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swap! (clj)

(source)

function

(swap! atom f) (swap! atom f x) (swap! atom f x y) (swap! atom f x y & args)
Atomically swaps the value of atom to be: (apply f current-value-of-atom args). Note that f may be called multiple times, and thus should be free of side effects. Returns the value that was swapped in.

Examples