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Programming is fun lildata

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lildata / useful.clj
Created August 27, 2015 18:13
(pprint (loaded-libs))
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lildata / dynamic-change-classpath-in-repl.clj
Created September 2, 2015 14:01
As seen on http://blog.japila.pl/2011/01/dynamically-redefining-classpath-in-clojure-repl/ see also add-classpath (depreciated) https://clojuredocs.org/clojure.core/add-classpath and addURL
user=> (System/getProperty "java.class.path")
"/some/path/clojure/clojure.jar"
user=> (System/setProperty "java.class.path" ".:/some/path/clojure/clojure.jar:/some/other/lib.jar")
".:/some/path/clojure/clojure.jar:/some/other/lib.jar"
user=> (def cl (-> (Thread/currentThread) (.getContextClassLoader)))
#'user/cl
user=> cl
#<DynamicClassLoader clojure.lang.DynamicClassLoader@19c5466b>
user=> (-> cl (.addURL (java.net.URL. "file:///some/other/lib.jar")))
nil
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lildata / embed-clojure-in.java
Created September 2, 2015 14:08
As seen on http://blog.japila.pl/2012/03/clojures-java-interop-in-java/
import java.util.Arrays;
import java.util.Iterator;
import clojure.lang.IFn;
import clojure.lang.LazySeq;
import clojure.lang.RT;
public class Main {
public static void main(String[] args) {
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lildata / clojure-runtime.md
Last active January 5, 2016 14:47 
(ns learning.hello
  (:gen-class))

The :gen-class directive in the ns declaration tells Clojure to generate a named Java class when it compiles the namespace.

You can compile in the repl !!

user=&gt; (load "learning/hello")
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lildata / fin-npv.clj
Created September 9, 2015 15:24
(defnk net-present-value
"(net-present-value :rate 0.05 :cashflows [-1000 500 600 800])"
[:rate :cashflows]
(reduce + (map #(/ %1 (pow (inc rate) %2)) cashflows (range))))
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lildata / common-1-letter-var-names.clj
Last active September 10, 2015 21:08
One letter variables names that most people will probably recognize
x: item
n: a number
m: map
v: value
k: key
i: index
c: char
t: tree
f: function
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lildata / simple-date-format.clj
Created September 10, 2015 21:10
there is a simpler one I think if you have Java 8
(.format (java.text.SimpleDateFormat. "yyyy-MM-dd") (java.util.Date.))
@lildata
lildata / regex.md
Created September 19, 2015 11:01

\w is the same as [a-zA-Z0-9]

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lildata / 00-clojure-awt-swing-seesaw.md
Last active October 13, 2015 12:33

hello

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lildata / 00_clojure-koans.clj
Last active December 3, 2021 09:16
(dont cheat)