http://clojuredocs.org Fri, 25 May 2012 02:08:35 GMT Recently updated examples and comments from ClojureDocs.org. http://clojuredocs.org/clojure_core/clojure.core/into-array ;;&nbsp;java.nio.file.Paths#get&nbsp;takes&nbsp;(String,&nbsp;String...)<br&nbsp;/>user=>&nbsp;(java.nio.file.Paths/get&nbsp;"/Users"&nbsp;(into-array&nbsp;["username"&nbsp;"dev"&nbsp;"clojure"]))<br&nbsp;/>#<UnixPath&nbsp;/Users/username/dev/clojure> Fri, 25 May 2012 02:08:35 GMT http://clojuredocs.org/clojure_core/clojure.core/set-validator! user=>&nbsp;(def&nbsp;atm&nbsp;(atom&nbsp;[2])<br&nbsp;/>#'user/atm<br&nbsp;/><br&nbsp;/>user=>&nbsp;(set-validator!&nbsp;atm&nbsp;#(every?&nbsp;even?&nbsp;%))<br&nbsp;/>nil<br&nbsp;/><br&nbsp;/>user=>&nbsp;(swap!&nbsp;atm&nbsp;into&nbsp;[5])<br&nbsp;/>#<CompilerException&nbsp;java.lang.IllegalStateException:&nbsp;Invalid&nbsp;reference&nbsp;state&nbsp;(NO_SOURCE_FILE:0)><br&nbsp;/><br&nbsp;/>user=>&nbsp;(set-validator!&nbsp;atm&nbsp;nil)<br&nbsp;/>nil<br&nbsp;/><br&nbsp;/>user=>&nbsp;(swap!&nbsp;atm&nbsp;into&nbsp;[5]))<br&nbsp;/>[2&nbsp;5] Tue, 22 May 2012 14:11:47 GMT http://clojuredocs.org/clojure_core/clojure.core/remove-method Mon, 21 May 2012 00:25:13 GMT http://clojuredocs.org/clojure_core/clojure.core/remove-all-methods Mon, 21 May 2012 00:25:06 GMT http://clojuredocs.org/clojure_core/clojure.core/methods Mon, 21 May 2012 00:24:37 GMT http://clojuredocs.org/clojure_core/clojure.core/methods Mon, 21 May 2012 00:24:34 GMT http://clojuredocs.org/clojure_core/clojure.core/methods Mon, 21 May 2012 00:24:26 GMT http://clojuredocs.org/clojure_core/clojure.core/methods Mon, 21 May 2012 00:24:23 GMT http://clojuredocs.org/clojure_core/clojure.core/get-method Mon, 21 May 2012 00:24:12 GMT http://clojuredocs.org/clojure_core/clojure.core/get-method Mon, 21 May 2012 00:24:06 GMT http://clojuredocs.org/clojure_core/clojure.core/remove-method Mon, 21 May 2012 00:23:58 GMT http://clojuredocs.org/clojure_core/clojure.core/remove-method Mon, 21 May 2012 00:23:55 GMT http://clojuredocs.org/clojure_core/clojure.core/prefers Mon, 21 May 2012 00:23:24 GMT http://clojuredocs.org/clojure_core/clojure.core/prefers Mon, 21 May 2012 00:23:20 GMT http://clojuredocs.org/clojure_core/clojure.core/prefers Mon, 21 May 2012 00:23:13 GMT http://clojuredocs.org/clojure_core/clojure.core/prefer-method Mon, 21 May 2012 00:22:57 GMT http://clojuredocs.org/clojure_core/clojure.core/prefer-method Mon, 21 May 2012 00:22:44 GMT http://clojuredocs.org/clojure_core/clojure.core/prefer-method Mon, 21 May 2012 00:22:33 GMT http://clojuredocs.org/clojure_core/clojure.core/mapcat user=>&nbsp;(mapcat&nbsp;(fn&nbsp;[[k&nbsp;v]]&nbsp;<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(for&nbsp;[[k2&nbsp;v2]&nbsp;v]&nbsp;<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(concat&nbsp;[k&nbsp;k2]&nbsp;v2)))<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;'{:a&nbsp;{:x&nbsp;(1&nbsp;2)&nbsp;:y&nbsp;(3&nbsp;4)}<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:b&nbsp;{:x&nbsp;(1&nbsp;2)&nbsp;:z&nbsp;(5&nbsp;6)}})<br&nbsp;/><br&nbsp;/>((:a&nbsp;:x&nbsp;1&nbsp;2)&nbsp;(:a&nbsp;:y&nbsp;3&nbsp;4)&nbsp;(:b&nbsp;:x&nbsp;1&nbsp;2)&nbsp;(:b&nbsp;:z&nbsp;5&nbsp;6)) Fri, 18 May 2012 02:28:06 GMT http://clojuredocs.org/clojure_core/clojure.walk/walk Thu, 17 May 2012 20:04:28 GMT http://clojuredocs.org/clojure_core/clojure.walk/walk Thu, 17 May 2012 20:04:09 GMT http://clojuredocs.org/clojure_core/clojure.core/keep-indexed user=>&nbsp;(keep-indexed&nbsp;#(if&nbsp;(odd?&nbsp;%1)&nbsp;%2)&nbsp;[:a&nbsp;:b&nbsp;:c&nbsp;:d&nbsp;:e])<br&nbsp;/>(:b&nbsp;:d) Wed, 16 May 2012 10:29:13 GMT http://clojuredocs.org/clojure_core/clojure.core/keep-indexed Wed, 16 May 2012 10:25:04 GMT http://clojuredocs.org/clojure_core/clojure.core/keep Wed, 16 May 2012 10:24:41 GMT http://clojuredocs.org/clojure_core/clojure.core/io! user=>&nbsp;(def&nbsp;a&nbsp;(ref&nbsp;0))<br&nbsp;/>#'user/a<br&nbsp;/><br&nbsp;/>user=>&nbsp;(dosync<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(io!&nbsp;(println&nbsp;"hello"))<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(alter&nbsp;a&nbsp;inc))<br&nbsp;/>IllegalStateException&nbsp;I/O&nbsp;in&nbsp;transaction<br&nbsp;/><br&nbsp;/>user=>&nbsp;(dosync<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(println&nbsp;"hello")<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(alter&nbsp;a&nbsp;inc))<br&nbsp;/>"hello"<br&nbsp;/>1<br&nbsp;/><br&nbsp;/>user=>&nbsp;(defn&nbsp;fn-with-io&nbsp;[]<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(io!&nbsp;(println&nbsp;"hello")))<br&nbsp;/>#'user/fn-with-io<br&nbsp;/><br&nbsp;/>user=>&nbsp;(dosync<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(fn-with-io)<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(alter&nbsp;a&nbsp;inc))<br&nbsp;/>IllegalStateException&nbsp;I/O&nbsp;in&nbsp;transaction Tue, 15 May 2012 22:46:08 GMT http://clojuredocs.org/clojure_core/clojure.core/extends_q user=>&nbsp;(defprotocol&nbsp;Area&nbsp;(get-area&nbsp;[this]))<br&nbsp;/>Area<br&nbsp;/><br&nbsp;/>user=>&nbsp;(defrecord&nbsp;Rectangle&nbsp;[width&nbsp;height]<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Area<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(get-area&nbsp;[this]<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(*&nbsp;width&nbsp;height)))<br&nbsp;/>user.Rectangle<br&nbsp;/><br&nbsp;/>(extends?&nbsp;Area&nbsp;Rectangle)<br&nbsp;/>true<br&nbsp;/> Tue, 15 May 2012 22:33:12 GMT http://clojuredocs.org/clojure_contrib/clojure.contrib.string/escape (clojure.string/escape&nbsp;"asdf"&nbsp;{\a&nbsp;\b})&nbsp;<br&nbsp;/>=>&nbsp;"bsdf"<br&nbsp;/>(clojure.string/escape&nbsp;"asdf"&nbsp;{\a&nbsp;"b"})&nbsp;<br&nbsp;/>=>&nbsp;"bsdf"<br&nbsp;/>(clojure.string/escape&nbsp;"asdf"&nbsp;{\a&nbsp;"bb"})&nbsp;<br&nbsp;/>=>&nbsp;"bbsdf" Tue, 15 May 2012 10:44:01 GMT http://clojuredocs.org/clojure_contrib/clojure.contrib.classpath/classpath ;;&nbsp;assuming&nbsp;that&nbsp;the&nbsp;clojure.contrib/java.classpath&nbsp;.jar<br&nbsp;/>;;&nbsp;is&nbsp;in&nbsp;your&nbsp;classpath&nbsp;(https://github.com/clojure/java.classpath/)<br&nbsp;/><br&nbsp;/>user=>&nbsp;(require&nbsp;'[clojure.java.classpath&nbsp;:as&nbsp;cp])<br&nbsp;/>nil<br&nbsp;/>user=>&nbsp;(cp/classpath)<br&nbsp;/>(#<File&nbsp;.>&nbsp;#<File&nbsp;/Users/klauer/.lein/self-installs/leiningen-2.0.0-preview3-standalone.jar>)<br&nbsp;/>user=>&nbsp; Mon, 14 May 2012 23:52:05 GMT http://clojuredocs.org/clojure_core/clojure.core/flatten As&nbsp;shown&nbsp;in&nbsp;the&nbsp;example,&nbsp;flatten&nbsp;will&nbsp;return&nbsp;an&nbsp;empty&nbsp;sequence&nbsp;when&nbsp;given&nbsp;any&nbsp;non-sequential&nbsp;thing.&nbsp;&nbsp;That&nbsp;can&nbsp;sometimes&nbsp;hide&nbsp;a&nbsp;bug.&nbsp; <br&nbsp;/> <br&nbsp;/>Here's&nbsp;another&nbsp;version&nbsp;that&nbsp;doesn't&nbsp;have&nbsp;that&nbsp;problem,&nbsp;and&nbsp;is&nbsp;faster&nbsp;as&nbsp;well. <br&nbsp;/> <br&nbsp;/> <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;(defn&nbsp;flatten2 <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"Like&nbsp;`clojure.core/flatten`&nbsp;but&nbsp;better,&nbsp;stronger,&nbsp;faster. <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Takes&nbsp;any&nbsp;nested&nbsp;combination&nbsp;of&nbsp;sequential&nbsp;things&nbsp;(lists,&nbsp;vectors, <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;etc.)&nbsp;and&nbsp;returns&nbsp;their&nbsp;contents&nbsp;as&nbsp;a&nbsp;single,&nbsp;flat,&nbsp;lazy&nbsp;sequence. <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If&nbsp;the&nbsp;argument&nbsp;is&nbsp;non-sequential&nbsp;(numbers,&nbsp;maps,&nbsp;strings,&nbsp;nil,&nbsp; <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;etc.),&nbsp;returns&nbsp;the&nbsp;original&nbsp;argument." <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{:static&nbsp;true} <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[x] <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(letfn&nbsp;[(flat&nbsp;[coll]&nbsp; <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(lazy-seq&nbsp; <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(when-let&nbsp;[c&nbsp;(seq&nbsp;coll)]&nbsp; <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(let&nbsp;[x&nbsp;(first&nbsp;c)]&nbsp; <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(if&nbsp;(sequential?&nbsp;x)&nbsp; <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(concat&nbsp;(flat&nbsp;x)&nbsp;(flat&nbsp;(rest&nbsp;c)))&nbsp; <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(cons&nbsp;x&nbsp;(flat&nbsp;(rest&nbsp;c))))))))] <br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(if&nbsp;(sequential?&nbsp;x)&nbsp;(flat&nbsp;x)&nbsp;x))) <br&nbsp;/> Sun, 13 May 2012 14:55:14 GMT http://clojuredocs.org/clojure_core/clojure.core/extend-type Fri, 11 May 2012 10:32:41 GMT http://clojuredocs.org/clojure_core/clojure.core/proxy ;;&nbsp;BUG:&nbsp;proxy&nbsp;dispatches&nbsp;*only*&nbsp;on&nbsp;name,&nbsp;not&nbsp;arity:<br&nbsp;/>user=>&nbsp;(let&nbsp;[p&nbsp;(proxy&nbsp;[java.io.InputStream]&nbsp;[]&nbsp;(read&nbsp;[]&nbsp;-1))]<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(println&nbsp;(.read&nbsp;p))<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(println&nbsp;(.read&nbsp;p&nbsp;(byte-array&nbsp;3)&nbsp;0&nbsp;3)))<br&nbsp;/><br&nbsp;/>-1<br&nbsp;/>ArityException&nbsp;Wrong&nbsp;number&nbsp;of&nbsp;args&nbsp;(4)&nbsp;passed&nbsp;to:&nbsp;core$eval213$fn&nbsp;&nbsp;clojure.lang.AFn.throwArity&nbsp;(AFn.java:437)<br&nbsp;/> Thu, 10 May 2012 14:48:10 GMT http://clojuredocs.org/clojure_core/clojure.core/extend-protocol Thu, 10 May 2012 10:22:15 GMT http://clojuredocs.org/clojure_core/clojure.core/extend-protocol Thu, 10 May 2012 10:22:08 GMT http://clojuredocs.org/clojure_core/clojure.core/future-call ;;&nbsp;future-call&nbsp;is&nbsp;used&nbsp;to&nbsp;implement&nbsp;'future'.&nbsp;&nbsp;See&nbsp;examples&nbsp;for&nbsp;'future'<br&nbsp;/>;;&nbsp;for&nbsp;discussion&nbsp;of&nbsp;an&nbsp;undesirable&nbsp;1-minute&nbsp;wait&nbsp;that&nbsp;can&nbsp;occur&nbsp;before<br&nbsp;/>;;&nbsp;your&nbsp;standalone&nbsp;Clojure&nbsp;program&nbsp;exits&nbsp;if&nbsp;you&nbsp;do&nbsp;not&nbsp;use&nbsp;shutdown-agents. Tue, 08 May 2012 21:33:38 GMT http://clojuredocs.org/clojure_core/clojure.core/pvalues Tue, 08 May 2012 21:30:25 GMT http://clojuredocs.org/clojure_core/clojure.core/pvalues ;;&nbsp;pvaules&nbsp;is&nbsp;implemented&nbsp;using&nbsp;Clojure&nbsp;futures.&nbsp;&nbsp;See&nbsp;examples&nbsp;for&nbsp;'future'<br&nbsp;/>;;&nbsp;for&nbsp;discussion&nbsp;of&nbsp;an&nbsp;undesirable&nbsp;1-minute&nbsp;wait&nbsp;that&nbsp;can&nbsp;occur&nbsp;before<br&nbsp;/>;;&nbsp;your&nbsp;standalone&nbsp;Clojure&nbsp;program&nbsp;exits&nbsp;if&nbsp;you&nbsp;do&nbsp;not&nbsp;use&nbsp;shutdown-agents. Tue, 08 May 2012 21:30:20 GMT http://clojuredocs.org/clojure_core/clojure.core/pcalls Tue, 08 May 2012 21:30:09 GMT http://clojuredocs.org/clojure_core/clojure.core/pcalls ;;&nbsp;pcalls&nbsp;is&nbsp;implemented&nbsp;using&nbsp;Clojure&nbsp;futures.&nbsp;&nbsp;See&nbsp;examples&nbsp;for&nbsp;'future'<br&nbsp;/>;;&nbsp;for&nbsp;discussion&nbsp;of&nbsp;an&nbsp;undesirable&nbsp;1-minute&nbsp;wait&nbsp;that&nbsp;can&nbsp;occur&nbsp;before<br&nbsp;/>;;&nbsp;your&nbsp;standalone&nbsp;Clojure&nbsp;program&nbsp;exits&nbsp;if&nbsp;you&nbsp;do&nbsp;not&nbsp;use&nbsp;shutdown-agents. Tue, 08 May 2012 21:30:04 GMT http://clojuredocs.org/clojure_core/clojure.core/pmap ;;&nbsp;pmap&nbsp;is&nbsp;implemented&nbsp;using&nbsp;Clojure&nbsp;futures.&nbsp;&nbsp;See&nbsp;examples&nbsp;for&nbsp;'future'<br&nbsp;/>;;&nbsp;for&nbsp;discussion&nbsp;of&nbsp;an&nbsp;undesirable&nbsp;1-minute&nbsp;wait&nbsp;that&nbsp;can&nbsp;occur&nbsp;before<br&nbsp;/>;;&nbsp;your&nbsp;standalone&nbsp;Clojure&nbsp;program&nbsp;exits&nbsp;if&nbsp;you&nbsp;do&nbsp;not&nbsp;use&nbsp;shutdown-agents. Tue, 08 May 2012 21:14:02 GMT http://clojuredocs.org/clojure_core/clojure.java.shell/sh ;;&nbsp;sh&nbsp;is&nbsp;implemented&nbsp;using&nbsp;Clojure&nbsp;futures.&nbsp;&nbsp;See&nbsp;examples&nbsp;for&nbsp;'future'<br&nbsp;/>;;&nbsp;for&nbsp;discussion&nbsp;of&nbsp;an&nbsp;undesirable&nbsp;1-minute&nbsp;wait&nbsp;that&nbsp;can&nbsp;occur&nbsp;before<br&nbsp;/>;;&nbsp;your&nbsp;standalone&nbsp;Clojure&nbsp;program&nbsp;exits&nbsp;if&nbsp;you&nbsp;do&nbsp;not&nbsp;use&nbsp;shutdown-agents. Tue, 08 May 2012 21:13:48 GMT http://clojuredocs.org/clojure_core/clojure.java.shell/sh Tue, 08 May 2012 21:13:30 GMT http://clojuredocs.org/clojure_core/clojure.core/pmap Tue, 08 May 2012 21:12:13 GMT http://clojuredocs.org/clojure_core/clojure.core/future ;;&nbsp;save&nbsp;the&nbsp;example&nbsp;in&nbsp;a&nbsp;script&nbsp;(e.g.&nbsp;test-future.clj)&nbsp;then&nbsp;run&nbsp;it&nbsp;in&nbsp;the&nbsp;console<br&nbsp;/>;;<br&nbsp;/>;;&nbsp;>&nbsp;clojure&nbsp;test-future.clj<br&nbsp;/><br&nbsp;/>(println&nbsp;"[Main]&nbsp;calculate&nbsp;the&nbsp;answer&nbsp;to&nbsp;life&nbsp;the&nbsp;universe&nbsp;and&nbsp;everything")<br&nbsp;/><br&nbsp;/>;;&nbsp;Used&nbsp;Thread/sleep&nbsp;to&nbsp;simulate&nbsp;long&nbsp;running&nbsp;process<br&nbsp;/>(def&nbsp;what-is-the-answer-to-life&nbsp;(future&nbsp;<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;(do&nbsp;<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(println&nbsp;"[Future]&nbsp;started&nbsp;computation")<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(Thread/sleep&nbsp;3000)&nbsp;;;&nbsp;running&nbsp;for&nbsp;3&nbsp;seconds<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(println&nbsp;"[Future]&nbsp;completed&nbsp;computation")<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;42)))<br&nbsp;/>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br&nbsp;/>(println&nbsp;"[Main]&nbsp;created&nbsp;future")<br&nbsp;/><br&nbsp;/>(Thread/sleep&nbsp;1000)<br&nbsp;/>(println&nbsp;"[Main]&nbsp;do&nbsp;other&nbsp;things&nbsp;while&nbsp;waiting&nbsp;for&nbsp;the&nbsp;answer")<br&nbsp;/>(println&nbsp;"[Main]&nbsp;get&nbsp;the&nbsp;answer")<br&nbsp;/>(println&nbsp;"[Main]&nbsp;the&nbsp;result"&nbsp;@what-is-the-answer-to-life)<br&nbsp;/>(shutdown-agents)<br&nbsp;/><br&nbsp;/><br&nbsp;/>;;&nbsp;You&nbsp;may&nbsp;get&nbsp;something&nbsp;like&nbsp;this<br&nbsp;/>;;<br&nbsp;/>;;&nbsp;[Main]&nbsp;calculate&nbsp;the&nbsp;answer&nbsp;to&nbsp;life&nbsp;the&nbsp;universe&nbsp;and&nbsp;everything<br&nbsp;/>;;&nbsp;[Future]&nbsp;started&nbsp;computation<br&nbsp;/>;;&nbsp;[Main]&nbsp;created&nbsp;future<br&nbsp;/>;;&nbsp;[Main]&nbsp;do&nbsp;other&nbsp;things&nbsp;while&nbsp;waiting&nbsp;for&nbsp;the&nbsp;answer<br&nbsp;/>;;&nbsp;[Main]&nbsp;get&nbsp;the&nbsp;answer<br&nbsp;/>;;&nbsp;[Future]&nbsp;completed&nbsp;computation<br&nbsp;/>;;&nbsp;[Main]&nbsp;the&nbsp;result&nbsp;42<br&nbsp;/><br&nbsp;/><br&nbsp;/>;;&nbsp;Note:&nbsp;If&nbsp;you&nbsp;leave&nbsp;out&nbsp;the&nbsp;call&nbsp;to&nbsp;(shutdown-agents),&nbsp;the&nbsp;program&nbsp;will&nbsp;on<br&nbsp;/>;;&nbsp;most&nbsp;(all?)&nbsp;OS/JVM&nbsp;combinations&nbsp;"hang"&nbsp;for&nbsp;1&nbsp;minute&nbsp;before&nbsp;the&nbsp;process&nbsp;exits.<br&nbsp;/>;;&nbsp;It&nbsp;is&nbsp;simply&nbsp;waiting&nbsp;for&nbsp;background&nbsp;threads,&nbsp;created&nbsp;by&nbsp;the&nbsp;future&nbsp;call,&nbsp;to<br&nbsp;/>;;&nbsp;be&nbsp;shut&nbsp;down.&nbsp;&nbsp;shutdown-agents&nbsp;will&nbsp;shut&nbsp;them&nbsp;down&nbsp;immediately,&nbsp;or<br&nbsp;/>;;&nbsp;(System/exit&nbsp;<exit-status>)&nbsp;will&nbsp;exit&nbsp;immediately&nbsp;without&nbsp;waiting&nbsp;for&nbsp;them<br&nbsp;/>;;&nbsp;to&nbsp;shut&nbsp;down.<br&nbsp;/><br&nbsp;/>;;&nbsp;This&nbsp;wait&nbsp;occurs&nbsp;even&nbsp;if&nbsp;you&nbsp;use&nbsp;futures&nbsp;indirectly&nbsp;through&nbsp;some&nbsp;other&nbsp;Clojure<br&nbsp;/>;;&nbsp;functions&nbsp;that&nbsp;use&nbsp;them&nbsp;internally,&nbsp;such&nbsp;as&nbsp;pmap&nbsp;or&nbsp;clojure.java.shell/sh<br&nbsp;/><br&nbsp;/>;;&nbsp;http://dev.clojure.org/jira/browse/CLJ-124&nbsp;is&nbsp;a&nbsp;ticket&nbsp;opened&nbsp;against&nbsp;Clojure,<br&nbsp;/>;;&nbsp;as&nbsp;this&nbsp;1-minute&nbsp;wait&nbsp;is&nbsp;not&nbsp;considered&nbsp;desirable&nbsp;behavior. Tue, 08 May 2012 21:10:40 GMT http://clojuredocs.org/clojure_core/clojure.core/future Tue, 08 May 2012 21:04:21 GMT http://clojuredocs.org/clojure_core/clojure.core/defmacro Sun, 06 May 2012 06:32:02 GMT http://clojuredocs.org/clojure_core/clojure.core/defmacro Sun, 06 May 2012 06:31:28 GMT http://clojuredocs.org/clojure_core/clojure.core/defmacro Sun, 06 May 2012 06:31:19 GMT http://clojuredocs.org/clojure_core/clojure.core/lazy-seq ;;&nbsp;A&nbsp;lazy-seq&nbsp;of&nbsp;Fibonacci&nbsp;numbers&nbsp;(fn&nbsp;=&nbsp;fn-1&nbsp;+&nbsp;fn-2)<br&nbsp;/>;;&nbsp;The&nbsp;producer&nbsp;function&nbsp;takes&nbsp;exactly&nbsp;two&nbsp;parameters<br&nbsp;/>;;&nbsp;(because&nbsp;we&nbsp;need&nbsp;the&nbsp;last&nbsp;2&nbsp;elements&nbsp;to&nbsp;produce&nbsp;a&nbsp;new&nbsp;one)<br&nbsp;/>user=>&nbsp;(defn&nbsp;fib&nbsp;[a&nbsp;b]&nbsp;(lazy-seq&nbsp;(cons&nbsp;a&nbsp;(fib&nbsp;b&nbsp;(+&nbsp;b&nbsp;a)))))<br&nbsp;/><br&nbsp;/>user=>&nbsp;(take&nbsp;5&nbsp;(fib&nbsp;1&nbsp;1))<br&nbsp;/>(1&nbsp;1&nbsp;2&nbsp;3&nbsp;5) Sat, 05 May 2012 03:49:26 GMT http://clojuredocs.org/clojure_core/clojure.core/declare Fri, 04 May 2012 14:53:10 GMT http://clojuredocs.org/clojure_core/clojure.core/swap! user>&nbsp;(def&nbsp;counter&nbsp;(atom&nbsp;0))<br&nbsp;/>#'user/counter<br&nbsp;/><br&nbsp;/>user>&nbsp;(swap!&nbsp;counter&nbsp;inc)<br&nbsp;/>1<br&nbsp;/><br&nbsp;/>user>&nbsp;(swap!&nbsp;counter&nbsp;inc)<br&nbsp;/>2 Mon, 30 Apr 2012 20:50:15 GMT