joecorcoran

# Define the method #each (without using Enumerable#each) so that
# the following prints three lines:

# def each ...
# ...
# end

rgb = ['red', 'blue', 'green']

each(rgb) do |c|

joecorcoran

# Use all examples to output the string "Hello, Sven!"

def hello_0(&block)
  puts yield
end

def hello_1(&block)
  puts block.call
end

joecorcoran

# Simple user class
# We're pretending this is an ActiveRecord::Base model
class User
  attr_reader :name

  def initialize(name)
    @name = name
  end
end

joecorcoran

# Use the method #call on each of these
# examples, to return the value `:hi`

class One
  def call
    :hi
  end
end

class Two

joecorcoran

Baked sweet potatoes

• 2 large sweet potatoes
• 250g baby spinach
• 10 chestnuts
• 150g goats cheese
• 2 cloves of garlic
• Butter/oil
• Salt/pepper

joecorcoran

# Code challenge!
#
# 1. Save the contents of this gist in a
#    file named classes.rb
#
# 2. Define the initialize method for class B
#    so that, when you run `ruby classes.rb`,
#    the output in the terminal is `true`
#
#    (Don't define any other methods or

joecorcoran

Keybase proof

I hereby claim:

• I am joecorcoran on github.
• I am joecorcoran (https://keybase.io/joecorcoran) on keybase.
• I have a public key ASBxexs-G58IclQz_BXqF5ql0W3WyhYWdPvZQ_iYQe8wdgo

To claim this, I am signing this object:

joecorcoran

# A weird quirk of keyword args in Ruby that just tripped me up.
# An object passed as the second argument here will be used
# differently depending on its type.
def test(a, b = [], **c)
  [a, b, c]
end

# As expected, the default values work.
test(:one)           # => [:one, [], {}]
test(:one, :two)     # => [:one, :two, {}]

joecorcoran

# In your terminal (Mac OS X):

createuser -s pguser
psql postgres

# In your terminal (Ubuntu):

sudo -u postgres createuser -s pguser
sudo -u postgres psql

joecorcoran

export PATH=$PATH:/Applications/Postgres.app/Contents/Versions/9.4/bin