puts „Hello World!“

• Some data types in Ruby:

  • String: 'Surely some revelation is at hand'
  • Numeric: 42, -100, 3.14
  • Array: [1, 'two', Person.new, nil, [3, 4]]
  • Hash: {:name => 'me', :age => 33}
  • Regexp: /^\d{4}-\d{2}-\d{2}$/
  • Range: 1..10, 'a'...'f'
  • Boolean: true, false (and everything else)

• ... but these are syntactic sugar