DAddYE

[user]
	name = DAddYE
	email = info@daddye.it
[alias]
	co = checkout
	st = status
	ci = commit
	br = branch
	sm = submodule
	lg = log --color --graph --pretty=format:'%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --abbrev-commit

DAddYE

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

DAddYE

require "./points"

p1 = RustPoint::make_point(10, 10) #  => #<Fiddle::Pointer:0x007f8231e56510 ptr=0x0000010b824000 size=0 free=0x00000000000000> 
p2 = RustPoint::make_point(20, 20) #  => #<Fiddle::Pointer:0x007f8231f20970 ptr=0x0000010b824010 size=0 free=0x00000000000000> 

RustPoint::get_distance(p1, p2) # => 14.142135623730951 

DAddYE

Learn you a Haskell - In a nutshell

This is a summary of the "Learn You A Haskell" online book under http://learnyouahaskell.com/chapters.

---

1. Introduction

• Haskell is a functional programming language.

DAddYE

class HTTPRouter
   self()
      self.routes = { }
   end
   add(verb = String, path = String, func = Function)
      self.routes[#self.routes + 1] = Route(verb, path, func)
   end
   match(verb, path)
      for i=1, #self.routes do
         m, q = self.routes[i].match(verb, path)

DAddYE

Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert $1 -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 $2

Results

DAddYE

Ruby 2.1.0 in Production: known bugs and patches

Last week, we upgraded the github.com rails app to ruby 2.1.0 in production.
While testing the new build for rollout, we ran into a number of bugs. Most of
these have been fixed on trunk already, but I've documented them below to help
anyone else who might be testing ruby 2.1 in production.

@naruse I think we should backport these patches to the ruby_2_1 branch and
release 2.1.1 sooner rather than later, as some of the bugs are quite critical.
I'm happy to offer any assistance I can to expedite this process.

DAddYE

###
# Execute tests in parallel using multiple processes.  Uses DRb to communicate
# between processes over a unix socket.

gem 'minitest', '~> 5.1.0'
require 'minitest'
require 'minitest/spec'
require 'minitest/mock'
require 'drb'
require 'drb/unix'

DAddYE

require 'fiddle'
require 'fiddle/import'

module GVL
  include Fiddle
  extend Importer

  dlload Handle::DEFAULT

  T = import_function 'rb_thread_call_without_gvl', TYPE_VOIDP,

DAddYE

For each Ruby module/class, we have Ruby methods on the left and the equivalent
Clojure functions and/or relevant notes are on the right.

For clojure functions, symbols indicate existing method definitions, in the 
clojure namespace if none is explicitly given.  clojure.contrib.*/* functions can
be obtained from http://github.com/kevinoneill/clojure-contrib/tree/master,
ruby-to-clojure.*/* functions can be obtained from the source files in this
gist.

If no method symbol is given, we use the following notation: