Good morning!

Ruby vs The World

Favorite Language?

History

Speed???

vs

There's always another story... 

Pure OO

 1.methods => => [:to_s, :inspect, ...]"a string".class => String

Vehicle.new # not new Vehicle()1 + 2 # => 1.+(2)

Mixins

• like interfaces, but with implementation
• better than interfaces (Java)
• clearer than multiple-inheritence (C++/Python) 
  

Elegant & Readable

cars.map(&:registration_number).reject(&:empty?).join("\n")

// the map part, in Java:List<String> plates = new ArrayList<String>();
for(Car c: cars) {
    plates.add(c.registrationNumber();
}

sentence.split.reverse.join ' ' # ruby" ".join(reversed(sentence.split())) # python

Principle of Least Astonishment

 File: read, open, exists?, path

Functional

 Array/Hash/any Enumerable:   numbers.all? {|number| number.odd? }   ... none?, any?, none?, one?, include?   each, map, reduce, select/reject, sort/group/count, slice etc.

Powerful Meta-Programming

• method_missing
  

xml = Builder::XmlMarkup.new(:target=>STDOUT, :indent=>2)xml.coder {  xml.name 'Matsumoto', :nickname => 'Matz'  xml.language 'Ruby'}# ⇒ <coder><name nickname="Matz">Matsumoto</name><language>Ruby</language></coder>

• evals and define_method
  

# Task: description(string), completed(boolean)Task.find(:one, :conditions => {description: 'Attend #RailsGardenBLR'})Task.find_by_description('Attend #RailsGardenBLR')Task.find_all_by_completed(true)
Task.find_or_create_by_description('Go back happy!')

Meta-Programming Gyaan

The best part: Community

• MINASWAN
  
• ecosystem/open source
• We have lots of drama too!

The best-est part: Developer Happiness

The goal of Ruby is to make programmers happy. I started out to make a programming language that would make me happy, and as a side effect it’s made many, many programmers happy.

- Matz

Happiness has a cascading effect. Happy programmers do the right thing. They write simple, readable code. They take clean, expressive, readable, elegant approaches. They have fun.

- DHH, 37Signals

Thank you!