jfredett

-- Boustrophedon Transform in 1 line of haskell. Shove this in your GHCI, it will give you a function `pp`
-- which takes a function f :: Num a => (Integer -> a) and a depth v :: Num a => a, the former is the 
-- sequence to transform, the latter is the depth of the tree to create.

-- I suggest running the results through mapM_ (putStrLn.show), it'll pretty print each level of the tree
-- in order. 

let pp f v = let b s k n = if n==0 then s k else (b s k (n-1)) + (b s (k-1) (k-n)) in (\s k -> [[b s n' k' | k<-[1..n']]|n'<-[1..l]]) f v

jfredett

#!/usr/bin/env sh

##
# This is script with usefull tips taken from:
#   https://github.com/mathiasbynens/dotfiles/blob/master/.osx
#
# install it:
#   curl -sL https://raw.github.com/gist/2108403/hack.sh | sh
#

jfredett

require 'minitest/autorun'

###
# Test to demonstrate TCO in Ruby.  Tested in 1.9.2+
class TestTCO < MiniTest::Unit::TestCase
  code = <<-eocode
    class Facts
      def fact_helper(n, res)
        if n == 1
          res

jfredett

# Here's how I might do it, though I'd probably skip the shared_examples and just duplicate them. I feel
# like it hides things a bit too much otherwise. Given that it doesn't represent a _huge_ extraction, I wouldn't
# mind the duplication.
# 
# I'm pretty sure that subject is preserved across shared example calls, if it's not, you might need to improvise.
#

shared_examples_for "Firefox browser" do
	its(:browser) { should == "Firefox" } 
	its(:security) { should == :strong }

jfredett

From 91c5562dc68d2b9f067b4bce76c14eff9e216cfc Mon Sep 17 00:00:00 2001
From: Joe Fredette <jfredett@gmail.com>
Date: Fri, 15 Jun 2012 13:28:43 -0400
Subject: [PATCH] add specs for Time#round

---
 spec/ruby/core/time/round_spec.rb |   54 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

diff --git a/spec/ruby/core/time/round_spec.rb b/spec/ruby/core/time/round_spec.rb

jfredett

lass TransactionalHash < Hash
  def transaction
    old = dup
    begin 
      return tap { yield(self) }
    rescue Exception => e
      clear
      old.each do |k,v|
        self[k] = v
      end

jfredett

#0  0x00007fff918f2212 in __pthread_kill ()
#1  0x00007fff93f33b34 in pthread_kill ()
#2  0x00007fff93f77dfa in abort ()
#3  0x00007fff93f78dd5 in __assert_rtn ()
#4  0x0000000100248b07 in rubinius::MethodCacheEntry::create (state=0x101604d50, klass=0x108a4a0c0, mod=0x108a4a0c0, exec=0x1a, method_missing=rubinius::eNone, super=false) at cache.cpp:16
#5  0x000000010005e1c1 in rubinius::InlineCache::fill_private (this=0x108c1c910, state=0x101604d50, name=0x2fce, start=0x108a4a0c0, klass=0x108a4a0c0, mce=@0x7fff5fbadcf8, super=false) at inline_cache.cpp:165
#6  0x000000010005e9e3 in rubinius::InlineCache::empty_cache_private (state=0x101604d50, cache=0x108c1c910, call_frame=0x7fff5fbafde0, args=@0x7fff5fbaf290) at inline_cache.cpp:402
#7  0x000000010005f42c in rubinius::InlineCache::initialize (this=0x108c1c910, state=0x101604d50, call_frame=0x7fff5fbafde0, args=@0x7fff5fbaf290) at inline_cache.hpp:201
#8  0x000000010005bd35 in rubinius::InlineCache::check_cache (state=0x101604d50, cache=0x108c1c910, call_frame=

jfredett

#requires rspec gem to be available, that's it.

require 'rspec'

class FailingClass
  def self.create
    new
  end
end
FailingClass.private_class_method :new, :allocate

jfredett

# Version 2 -- the cool version
require 'redis'
require 'forwardable' #standard ruby library
class RedisTester
  # this way, we create the instance and check to see it's running every time
  # we ask for it automatically.
  def redis
    @redis ||= Redis.new
    raise unless redis_is_running?
    @redis

jfredett

Stuff I learned about Puppet

Chef vs Puppet

• My blink is that in 2012 Puppet is safer and more productive.
• Puppet is declarative, Chef procedural.
• Puppet brings system into compliance (state), Chef "does" things (recipes).
• Puppet has strong security practices; Chef has a toleration for loose security in Chef itself.
• Puppet makes it very hard to get "outside the lines" or violate its strong opinions; in Chef this is routine.