Sam Neubardt samn
ptaoussanis
/ more-ifs.clj
Created
July 31, 2013 11:22
Some `if`/`when` helpers. Don't need these often (and avoid them whenever possible), but they're occasionally handy when dealing with particularly hairy code.
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| (defmacro iff [test & {:keys [then else]}] `(if ~test ~then ~else)) | |
| (comment (iff false | |
| :then (println "true") | |
| :else (println "false"))) | |
| (defmacro iff-let [bindings & {:keys [then else]}] `(if-let ~bindings ~then ~else)) | |
| (comment (iff-let [x true] :else "false" :then x)) | |
| (defmacro if-lets | |
| "Like `if-let` but binds multiple values iff all tests are true." |
nathanmarz
/ gist:1165885
Created
August 23, 2011 17:11
Benchmark between HashMap with lock vs. persistent map with atom
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| (defn map-incr-unsafe [] | |
| (let [m (java.util.HashMap.)] | |
| (.put m "a" 0) | |
| (doseq [i (range 1000000)] | |
| (let [a (.get m "a")] | |
| (.put m "a" (inc a)) | |
| )))) | |
| (defn map-incr-safe [] | |
| (let [o (Object.) |
richhickey
/ cells.clj
Created
February 17, 2010 01:28
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| ; Copyright (c) Rich Hickey. All rights reserved. | |
| ; The use and distribution terms for this software are covered by the | |
| ; Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php) | |
| ; which can be found in the file epl-v10.html at the root of this distribution. | |
| ; By using this software in any fashion, you are agreeing to be bound by | |
| ; the terms of this license. | |
| ; You must not remove this notice, or any other, from this software. | |
| (set! *warn-on-reflection* true) |