owainlewis

Postgresql Cheat Sheet
===============================

start: psql -U username databasename

quit: \q

list all: \d
list tables: \dt
list all databases: \l

owainlewis

:javascript
  var _gaq = _gaq || [];
  _gaq.push(['_setAccount', YOUR_CODE']);
  _gaq.push(['_trackPageview']);
  (function() {
    var ga = document.createElement('script');
    ga.type = 'text/javascript'; ga.async = true;
    ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
  })();

owainlewis

(defprotocol IO
  "A protocol for reading and writing"
  (read-file [this])
  (write-file [this]))

(extend-protocol IO
  String
  (read-file [file]
    (with-open [rdr (clojure.java.io/reader file)]
      (reduce conj [] (line-seq rdr))))

owainlewis

Install ClojureScript

git clone git://github.com/clojure/clojurescript.git
cd clojurescript
./script/bootstrap

In ClojureScript dir

export CLOJURESCRIPT_HOME=$HOME/

export PATH=$PATH:$CLOJURESCRIPT_HOME/bin:$CLOJURESCRIPT_HOME/script

owainlewis

(ns selenium-test.core
  (:use midje.sweet)
  (:use [clj-webdriver.taxi]))

(set-driver! {:browser :firefox})

(to "http://www.boxuk.com/")

(facts "About the homepage"  
  (visible? "#content") => true)

owainlewis

from math import sqrt

# Sieve of Erastothenes

def sieve(n):
    candidates = list(range(n))

    # We only need to check up to the square root of n
    upto = int(sqrt(n)) + 1

owainlewis

(ns euler.problem7
  (:use [euler.core]))

;; The algorithm for this is
;; - Start at the first 1000 primes
;; - If there are not enough primes then try again at 2000 etc

(defn get-nth-prime [n, max]
  "Returns the nth prime"
  (let [primes (sieve max)]

owainlewis

Cassandra CLI

Startup

1. bin/cassandra -f
2. bin/cassandra-cli

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# A Micro DSL for NET/HTTP

require 'net/http'
require 'net/https'
require "uri"

# Base class for making HTTP connections

module Query
  

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def group_sequence_by n, sequence
  Array.new.tap do |result|
    sequence.each_slice(n) { |item| result << item }
  end
end