vaz

mergesort :: (Ord t) => [t] -> [t]
mergesort [] = []
mergesort [x] = [x]
mergesort xs = (mergesort ls) `merge` (mergesort rs)
    where (ls,rs) = split xs
          split (x:y:zs)  = let (xs,ys) = split zs in (x:xs,y:ys)
          split [x]       = ([x],[])
          split []        = ([],[])
          merge xs []     = xs
          merge [] ys     = ys

vaz

Rails Asset Pipeline - Overview/Cheatsheet

Notes based on a lecture by vaz at Lighthouse Labs, Vancouver.

Note: this was based on Rails 4, and while most things haven't changed much and this still covers the concepts pretty well, make sure you've got the Rails Guide docs for the version you're actually using and keep in mind some things may have changed.

What is an asset?

vaz

Acceptance Testing

2016-05-18 breakout by Vaz

This breakout covered:

• Using RACK_ENV in the conventional way to use a different db for development than for tests
• Adding RSpec to the skeleton with a (very) basic model spec
• Introduction to acceptance testing and Capybara, focusing on form submission for creating new records

vaz

# basic sinatra app showing some use of sessions to handle
# some (insecure) authentication

require 'sinatra'

# enable default sessions support
# sessions are "like hashes" and get serialized (stringified) and
# stored directly in a session cookie.
# Sinatra (actually a Rack sessions extension) handles this for you
enable :sessions

vaz

Intro to HTTP

Here are the lecture notes from May 16, 2016: Intro to HTTP

What is HTTP

HTTP is Hyper-Text Transfer Protocol.

OK, What is Hyper-Text?

vaz

$ bash test.sh
This is what happens now. Simple Gemfile:
source 'https://rubygems.org'
gem 'listen'

Updating bundle...
Fetching gem metadata from https://rubygems.org/............
Fetching version metadata from https://rubygems.org/...
Fetching dependency metadata from https://rubygems.org/..
Resolving dependencies...

vaz

showAllFiles ()
{
    local new old=`defaults read com.apple.finder AppleShowAllFiles`;
    if [ "$old" = "TRUE" ]; then
        new="FALSE";
    else
        new="TRUE";
    fi;
    defaults write com.apple.finder AppleShowAllFiles $new;
    echo -n "com.apple.finder AppleShowAllFiles = ";

vaz

// ----
// Sass (v3.4.12)
// Compass (v1.0.3)
// ----

// RANGES
// We use these functions to define ranges for various things, like media queries.
@function lower-bound($range){
  @if length($range) <= 0 {
    @return 0;

vaz

# find primes up to n
def sieve(n)
  return n if n == 2
  s = (3..n).step(2).to_a
  s.each { |i| s.reject! { |j| j != i && j % i == 0 } }
end

def new_sieve(n)
  (s = maybe_primes(n)).each { |i| s.reject! { |j| j != i && j % i == 0 } }

vaz

// the self-calling function is a
// Javascript "module" pattern for
// not leaking stuff into global scope:
(function(){
  // simple closure example

  function loglater(message){
    return function logger(){
      console.log(message); // references outer function's argument