ngpestelos

# see Metaprogramming Ruby, p. 97

class C
  @@v = 1
end

class D < C
  def read; @@v; end
end

ngpestelos

class MyClass
  @my_var = 1

  def self.read; @my_var; end
  def write; @my_var = 2; end
  def read; @my_var; end
end

obj = MyClass.new
obj.write

ngpestelos

class MyClass
  @my_var = 1

  def self.read
    @my_var
  end
end

ngpestelos

# see Metaprogramming Ruby, p. 89

lambda {
  setups = []
  events = {}
  
  Kernel.send :define_method, :event do |name, &block|
    events[name] = block
  end
  

ngpestelos

# see Metaprogramming Ruby, p. 86

event "the sky is falling" do
  @sky_height < 300
end

event "it's getting closer" do
  @sky_height < @mountains_height
end

ngpestelos

# loads RVM into a shell session

if [[ -s "$HOME/.rvm/scripts/rvm" ]] ; then
  # try to load from a user install
  source "$HOME/.rvm/scripts/rvm"
elif [[ -s "/usr/local/rvm/scripts/rvm" ]] ; then
  # try to load the system rvm
  source "/usr/local/rvm/scripts/rvm"
else
  printf "ERROR: An rvm installation was not found.\n"

ngpestelos

# see Metaprogramming Ruby, p. 74

class MyClass
  def initialize
    @v = 1
  end
end

obj = MyClass.new
obj.instance_eval do

ngpestelos

def fetch_sitelink_promotions(store)
  []
end

ngpestelos

Sample Project: End of Day Application

I usually write progress reports at the end of the work day (as a summary of what I did for a project):

Other names for this application:

• work log
• activity stream

Examples

ngpestelos

# see Metaprogramming Ruby, p. 73
def define_methods
  shared = 0
  
  Kernel.send :define_method, :counter do
    shared
  end
  
  Kernel.send :define_method, :inc do |x|
    shared += x