kristjan

 79271
 104677
 107019
 174413
 201911
 198794
 209420
 208774
  62819
 181205

kristjan

# Data looks like:
# {
#   #"old": new,
#   "7583": 201343,
#   "7614": 280397,
#   "8381": 285146,
#   "9197": 285727,
#   "9356": 220591,
# }

kristjan

$ ruby proctest.rb
1
proctest.rb:2:in `block in <main>': wrong number of arguments (2 for 1) (ArgumentError)
	from proctest.rb:5:in `call'
	from proctest.rb:5:in `<main>'

kristjan

alert('hi!')

kristjan

module RequireImplementation
  def require_implementation(method_name)
    define_method method_name do
      raise NotImplementedError, "#{self.class.name} must implement #{method_name}"
    end
  end
end


class TestClass

kristjan

Keybase proof

I hereby claim:

• I am kristjan on github.
• I am kristjan (https://keybase.io/kristjan) on keybase.
• I have a public key whose fingerprint is 90B8 10A8 031E E111 893B 49B4 9455 B368 7480 A7AA

To claim this, I am signing this object:

kristjan

Disclaimer: None of this code was actually run!

What's a Promise

A way to handle something that happens asynchronously. Instead of getting your result back, you get a promise back that you can handle in a success way and a failure way. At some point in the future, the promise resolves to one of those cases, passing your success/failure functions the applicable data.

Why use promises?

kristjan

# All colors on all applications
$ for app in `heroku apps | tail -n +2`; do heroku config --app $app | cut -d':' -f1 | grep HEROKU_POSTGRESQL | cut -d_ -f3; done | sort | uniq -c | sort -rn
      4 WHITE
      3 CHARCOAL
      2 YELLOW
      2 ORANGE
      2 ONYX
      2 CRIMSON
      2 COBALT
      2 BRONZE

kristjan

$ rails c
Loading development environment (Rails 4.1.2)
[1] pry(main)> Specialist.find(15)
  Specialist Load (0.9ms)  SELECT  "specialists".* FROM "specialists"  WHERE "specialists"."id" = $1 LIMIT 1  [["id", 15]]
=> #<Specialist id: 15, ...>
[2] pry(main)> ActiveRecord::Base.logger.silence(Logger::FATAL) { Specialist.find(16) }
=> #<Specialist id: 16, ...>

kristjan

tags = %w[tag1 tag2 tag3]
h = tags.product([[]]).to_h
#=> {"tag1"=>[], "tag2"=>[], "tag3"=>[]}
h['tag1'] << 1
#=> [1]
h
#=> {"tag1"=>[1], "tag2"=>[1], "tag3"=>[1]}