Chris Pine, Learn to Program Chapter 2 - Letters

puts 'Hello, world!'
puts ''
puts 'Good-bye.'

# no space adding strings
puts 'I like' + 'apple pie.'

# spaces matter inside of strings
puts 'I like ' + 'apple pie.'
puts 'I like' + ' apple pie.'

# multiply strings
puts 'blink ' * 4

# numbers vs. digits
puts 12 + 12
puts '12' + '12'
puts '12 + 12'
puts 2 * 5
puts '2' * 5
puts '2 * 5'

# problems with strings - #<TypeError: can't convert Fixnum into String>
# puts '12' + 12
# puts 'Fred' * 'John'
# puts 'Will' + 12

# let the computer know I want to stay in the string with backslash (escape character for apostrophe and backslash itself)
puts 'You\'re swell!'
puts 'backslash at the end of a string: \\'
puts 'up\\down'
puts 'up\down'