filipebarcos

require 'benchmark/ips'

Benchmark.ips do |x|
  x.report("with lazy") do
    (1..1_000_000).lazy
                      .select(&:odd?)
                      .map(&:to_s)
                      .take(1000)
  end

filipebarcos

Please edit your Apache configuration file, and add these lines:

   LoadModule passenger_module /home/ubuntu/.rvm/gems/ruby-2.1.1/gems/passenger-4.0.57/buildout/apache2/mod_passenger.so
   <IfModule mod_passenger.c>
     PassengerRoot /home/ubuntu/.rvm/gems/ruby-2.1.1/gems/passenger-4.0.57
     PassengerDefaultRuby /home/ubuntu/.rvm/gems/ruby-2.1.1/wrappers/ruby
   </IfModule>

After you restart Apache, you are ready to deploy any number of web
applications on Apache, with a minimum amount of configuration!

filipebarcos

require 'benchmark'

n = 1000000
Benchmark.bm(15) do |x|
  x.report("assign single") { n.times do; c = 'a string'; end}
  x.report("assign double") { n.times do; c = "a string"; end}
  x.report("concat single") { n.times do; 'a string ' + 'b string'; end}
  x.report("concat double") { n.times do; "a string " + "b string"; end}
end

filipebarcos

module ClassMethods
  def self.method2
  end
end

module InstanceMethods
  def method1
  end
end

filipebarcos

Filipe Costa

Contact details

• Twitter: @filipebarcos
• Github: @filipebarcos
• Website or Blog: http://about.me/filipebarcos
• Company: Stack Builders Inc. http://stackbuilders.com

[Feel free to add more details if you wish…]

filipebarcos

#in real life this is going until column 98
@my_variable = MyVeryLongClassName.method("three", "arguments", "method") || default_value_method

# or

@my_variable = MyVeryLongClassName.method("three", "arguments", "method") 
@my_variable ||= default_value_method

# or
@my_variable = MyVeryLongClassName.method("three", "arguments", "method") 

filipebarcos

module Bar
  def self.method1
  end
  
  def method2
  end
end

class Foo
  include Bar

filipebarcos

#! /bin/bash

#with your postgresql setup up, with you postgres user too, let's do this o improve your postgresql performance
cd ~
wget http://pgfoundry.org/frs/download.php/2449/pgtune-0.9.3.tar.gz
tar -zxvf pgtune-0.9.3.tar.gz
cd pgtune-0.9.3
#first parameter is where your postgresql.conf is
./pgtune -i /etc/postgresql/9.0/main/postgresql.conf -o ~/postgresql.conf.pgtune --type Web
cp /etc/postgresql/9.0/main/postgresql.conf /etc/postgresql/9.0/main/postgresql.conf.bkp

filipebarcos

bash -l -c 'rbenv local 1.9.3-p125 &&
            gem install brakeman --no-ri --no-rdoc &&
            brakeman -o brakeman-output.tabs --no-progress --separate-models &&
            rbenv local --unset'

filipebarcos

# when I tried to start postgres, I had an error telling me there were no postgres clusters created
# so I had to create one using the `pg_createcluster` command, like the following
pg_createcluster 9.1 main --start

#after creating the cluster, it will start the server because of `--start`
#so I had to change to postgresql user
sudo su - postgres

#to change it's pasword, doing `psql -d <database_name> -U <username>
psql -d postgres -U postgres