ecoologic

cardType = (cc) ->
  result = "unknown"
  result = "mastercard" if /^5[1-5]/.test(cc)
  result = "visa"       if /^4/.test(cc)
  result = "amex"       if /^3[47]/.test(cc)
  result

luhn = (cc) ->
  sum = 0
  alt = false

ecoologic

Template Inheritance

Similarly to the Layout Inheritance logic, if a template or partial is not found in the conventional path, the controller will look for a template or partial to render in its inheritance chain. For example:

# in app/controllers/application_controller
class ApplicationController < ActionController::Base
end

# in app/controllers/admin_controller

ecoologic

class: center, middle

@net_engine

@erikecoologic

Slides available at ???????

---

class: center, middle

Boundaries

ecoologic

Faster Development

I'm looking for techniques to produce the same or better result in less time (without sacrificing quality). I'd be happy to read a good fluent book on the topic.

I work for a small web app development consultancy company. Our code doesn't need to be perfect and our clients are happy to have a few non-critical bugs / imperfection and save some money. I understand.

I hate when I'm in the middle of my development and I discover some detail that forces me to rewrite part of my envisioned solution. Once I TDD a controller API that turned out to be completely useless. It didn't take too long, but it's the sort of waste I'm referring to. Another time I learned how to use a small library, but never used it. Since then I've been doing some research to avoid useless development and become more effective in general.

Searching around "faster development" or similar keywords produces mostly results that focus on tools, like snippet and shortcuts for IDE, ZSH tricks etc, I think I'm setup fine for

ecoologic

# If the behaviour the gem you're monkey patching changes
# your monkey patch might not work anymore
if Gem::Specification.all_names.detect { |gem_v| gem_v == 'haml-3.1.8' }
  # my monkey patch here
else
  raise "Please check this gem works with the above monkey patch"
end

ecoologic

# One return per line makes it easy to understand / debug
def done?
  return false if no_one_done_it?
  return false if not_found?
  return true  if you_did_it?
  false
end

# Special case pattern (!= NullObject)
# Some, including Kent Beck and Martin Fowler argue that one or more guard clauses

ecoologic

Recycling in Brisbane

Items that can be placed in a recycling bin include:

• All paper (including junk mail, magazines, newspapers, window envelopes)
• Cans - aluminium and tin-plated steel cans and lids (e.g. food tins)
• Cardboard
• Clean kitchen aluminium foil (alfoil)
• Empty aerosol cans (full or partially full aerosol cans are considered hazardous waste)
• Foil pie trays

ecoologic

# /app/presenters/tweets/show.rb
module Tweets
  class ShowPresenter
    def initialize(tweet)
      @tweet = tweet
    end
   
    def tweet
      @tweet
    end

ecoologic

> lsof | grep 3000
dbus-daem 1248   emanuele   74u     unix 0xf6923000      0t0      10964 socket
gvfsd     1355   emanuele    3u     unix 0xee9a3000      0t0       6807 socket
tomboy    1379   emanuele  mem       REG        8,6   195452    1838262 /usr/lib/libgnomecanvas-2.so.0.3000.1
tomboy    1379   emanuele  mem       REG        8,6    84544    1838246 /usr/lib/libgnome-2.so.0.3000.0
gnome-pan 1381   emanuele  mem       REG        8,6   195452    1838262 /usr/lib/libgnomecanvas-2.so.0.3000.1
gnome-pan 1381   emanuele  mem       REG        8,6    84544    1838246 /usr/lib/libgnome-2.so.0.3000.0
nautilus  1382   emanuele  mem       REG        8,6   195452    1838262 /usr/lib/libgnomecanvas-2.so.0.3000.1
nautilus  1382   emanuele  mem       REG        8,6    84544    1838246 /usr/lib/libgnome-2.so.0.3000.0
firefox-b 1387   emanuele  mem       REG        8,6    30008      40566 /usr/lib/firefox-3.6.22/components/libdbusservice.so

ecoologic

# /etc/sysctl.conf
vm.overcommit_memory=1

# /etc/redis.conf
# comments on the same line gave problems

# custom conf 1gb, will solve a warning
maxmemory 1073741824 

# commenting these three lines will avoid redis to dump the db at all