ghoseb

;;
;; NS CHEATSHEET
;;
;; * :require makes functions available with a namespace prefix
;;  and optionally can refer functions to the current ns.
;;
;; * :import refers Java classes to the current namespace.
;;
;; * :refer-clojure affects availability of built-in (clojure.core)
;;   functions.

powerset.clj

(use '[clojure.set]
     '[clojure.test])
(defn powerset [ls]
  (if (empty? ls) '(())
      (union (powerset (next ls))
	    (map #(conj % (first ls)) (powerset (next ls))))))

(deftest test-powerset
  (is (= '(()) (powerset '())))
  (is (= '((1) ()) (powerset '(1))))

jramb

((ns excel.core
  (:import [org.apache.poi.hssf.usermodel HSSFWorkbook HSSFSheet HSSFRow
            HSSFRichTextString HSSFFont HSSFDataFormat 
            HSSFCellStyle HSSFCell])
  (:import [java.io FileOutputStream FileInputStream IOException])
  #_(:import [org.apache.poi.ss.util CellRangeAdrress]))


(defn make-excel [file-name]
  (let [wb (HSSFWorkbook.)

naaman

Hot Swapping With Maven, Jetty and IntelliJ

Based on Configuring Jetty, Maven, and Eclipse together with Hot Swap

I've always been a bit jealous when it comes to the Play! framework and the great dev mode they have for hot swapping classes at runtime. Jetty has a configuration setting, scanIntervalSeconds, that mimics this when working with a more traditional WAR, but does so by looking for changes to a file and restarting the server.

Fortunately, Jetty also provides the ability to rapidly test code with hot swapping. No more server restarts. The trick to getting hot swapping to work is to attach a remote debugger to your Jetty process. The following instructions outline how to do this in IntelliJ (tested with IDEA 10.5 CE).

Modify your jetty-maven-plugin to ignore the scan interval

1. Open your pom and locate the plugins section

PanosJee

// Collecting all unique affected app version for a given data set
var jsonStats = [
  {app_versions: ['1.2','1.2.3']},
  {app_versions: null},
  {app_versions: ['1.2','1.3']}
];
var app_versions = _.uniq(_.flatten(_.compact(_.map(jsonStats, function(day){return day.app_versions }))));
// ["1.2", "1.2.3", "1.3"]

// Bye bye stupid for loops!

jtan189

import java.security.SecureRandom;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.SecretKeyFactory;
import java.math.BigInteger;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;

/*
 * PBKDF2 salted password hashing.
 * Author: havoc AT defuse.ca

wfaler

// simple example of the cake pattern

// abstract DAO trait
trait Repository[A, B]{
  // saves an entity, returns an ID
  def save(entity: A): B
  // more features..
}

trait RdbmsRepository extends Repository[MyUserCaseClass, Long]{

CMCDragonkai

AngularJS Directive Attribute Binding Explanation

When using directives, you often need to pass parameters to the directive. This can be done in several ways. The first 3 can be used whether scope is true or false. This is still a WIP, so validate for yourself.

1. Raw Attribute Strings

   <div my-directive="some string" another-param="another string"></div>

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

allgress

(ns reagent-test.core
  (:require [reagent.core :as reagent :refer [atom]]
            [datascript :as d]
            [cljs-uuid-utils :as uuid]))

(enable-console-print!)

(defn bind
  ([conn q]
   (bind conn q (atom nil)))