rippinrobr

;; Here's the program.clj file from a VsClojure project.
;; First thing you need to do is add the :methods property
;; which takes a of methods that are to be generated when
;; the class is created.  Here, I'm generating a static method
;; named hi which has no parameters and returns a String.
;;
;; When program.hi() is called from the C# code the
;; the clojure function -hi will be called.  By default any
;; method in the :methods vector will be mapped to a function
;; with the same name prefixed by a -.  

tavisrudd

(defmacro defmethod
  "Creates and installs a new method of multimethod associated with dispatch-value. "
  {:added "1.0"}
  [multifn dispatch-val & fn-tail]
  `(. ~(with-meta multifn {:tag 'clojure.lang.MultiFn}) addMethod ~dispatch-val (fn ~@fn-tail)))

(defmacro defmethod-with-metadata
  "Creates and installs a new method of multimethod associated with dispatch-value. "
  {:added "1.0"}

jackrusher

Hofstadter on Lisp

In the mid-80s, while reading through my roommate's collection of Scientific American back issues, I encountered this introduction to Lisp written by Douglas Hofstadter. I found it very charming at the time, and provide it here (somewhat illegally) for the edification of a new generation of Lispers.

In a testament to the timelessness of Lisp, you can still run all the examples below in emacs if you install these aliases:

(defalias 'plus #'+)
(defalias 'quotient #'/)
(defalias 'times #'*)
(defalias 'difference #'-)

Jared314

admin@mailserver1
niceandsimple@example.com
very.common@example.com
a.little.lengthy.but.fine@dept.example.com
disposable.style.email.with+symbol@example.com

postbox@com

user@[192.168.2.1]
user@[IPv6:2001:db8:1ff::a0b:dbd0]

karanth

SSL is an important security and privacy feature for all websites. Its details are outlined in this wikipedia [article] ("http://en.wikipedia.org/wiki/Secure_Sockets_Layer"). At Scibler, we use SSL certificates, encrypting all traffic to and fro from our servers. SSL is a public-key based asymmetric encryption scheme for symmetric key exchange. Symmetric keys are used for payload encryption. On our servers, we use embedded jetty (ring jetty adapter), with the clojure [ring] (https://github.com/ring-clojure) library to handle the http specific functionality.

This is a tutorial about installing SSL certificates on jetty webservers. SSL certificates are X.509 certificates that can be self-signed (authorized by Scibler) or can be signed by trusted third-parties. Trusted third-party certificates are the ones that a Internet user and browsers trust the most. Trusted third-party certification authorities issue certificates per domain and charge a nominal yearly fee.

####Pre-Requisites

• The Java JDK has to be

eldritchideen

(ns scraping.core
  (:gen-class)
  (:import (org.jsoup Jsoup) 
  (org.jsoup.select Elements)
  (org.jsoup.nodes Element)))

(def URL "http://www.smh.com.au/business/markets/52-week-highs?page=-1")

(defn get-page []
  (.get (Jsoup/connect URL)))

tonymtz

launchctl unload /Library/LaunchAgents/org.macosforge.xquartz.startx.plist
sudo launchctl unload /Library/LaunchDaemons/org.macosforge.xquartz.privileged_startx.plist
sudo rm -rf /opt/X11* /Library/Launch*/org.macosforge.xquartz.* /Applications/Utilities/XQuartz.app /etc/*paths.d/*XQuartz
sudo pkgutil --forget org.macosforge.xquartz.pkg

# Log out and log in

akras14

Git Cheat Sheet

Commands

Getting Started

git init

or

devn

(require '[clojure.walk :as walk])
;; => nil

(defn transient? [x]
  (instance? clojure.lang.ITransientCollection x))
;; => #'user/transient?

(let [transients (walk/postwalk (fn [x]
                                  (if (map? x)
                                    (transient x)

msgodf

Condition Systems in an Exceptional Language by Chris Houser

I recently watched Chris Houser's talk from Clojure/conj 2015 on condition systems in Clojure. I enjoyed the subject, so I decided to write up the talk as a way of encouraging me to really understand it, and in the hope that it might help others understand it.

The last time I heard about Common Lisp's condition system was at a talk by Didier Verna at ACCU in Bristol in 2013 (slides here). It sounded really interesting, but I didn't understand it well enough.

tl;dr

Chris Houser talks about different ways of handling errors in Clojure. Based on examples from Peter Seibel's book, Practical Common Lisp, he describes condition systems, which are also known as resumable exceptions, or restarts.