Quick Clojure by Mark McDonnell

Author:Mark McDonnell
Language: eng
Format: epub
Publisher: Apress, Berkeley, CA

The delay function prevents an action from happening straight away. It is asynchronous until the point of being dereferenced, whereby it will block until the behavior has completed . Once a delay has been executed, it will cache its return value (see Listing 8-1 for example).

(def later (delay (prn "hello")))

;; returns immediately and doesn't block

;; ...some point later in your application...

@later ;; nil (prints "hello")

@later ;; nil (notice no "hello" is printed this time)

Listing 8-1.Example of Using delay

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