beezeebly

i = 1

until i == 11
  puts i
  i += 1
end

beezeebly

puts "This product is available" unless @private

beezeebly

authors = ["Arthur Conan Doyle", "J.K. Rowling", "J.R.R. Tolkien", "Hanif Kureishi"]

authors.each do |author|
  puts author
end

beezeebly

# Addition +
1 + 2 # result 3
# Subtraction -
2 - 1 # result 1
# Multiplication *
2 * 3 # result 6
# Division /
6 / 2 # result 3
# Modulus % returns the remainder of the left operand divided by the right operand
7 % 2 # result 1

beezeebly

a = 2
b = 3

# Equality ==
a == b # result false
# Not equal !=
a != b # result true
# Greater than >
a > b # result false
# Less than <

beezeebly

# equals =
a = 2 
# +=
a += 1 # a is now 3
# -=
a -= 1 # a is now 2 again
# Ruby does not have ++ or --
# *=
a *= 2 # a is now 4
# /=

beezeebly

# && the AND operator
true && true # result true
true && false # result false
false && false # result false
# || the OR operator
true || true # result true
true || false # result true
false || false # result false
# ! the NOT operator
!true # result false

beezeebly

@in_stock = true

book_availability = @in_stock ? "In Stock" : "Awaiting Delivery"
puts book_availability # result "In Stock"

beezeebly

authors = ["Arthur Conan Doyle", "J.K. Rowling", "J.R.R. Tolkien", "Hanif Kureishi"]

beezeebly

authors = ["Arthur Conan Doyle", "J.K. Rowling", "J.R.R. Tolkien", "Hanif Kureishi"]
authors[0] # => "Arthur Conan Doyle"
authors[1] # => "J.K. Rowling"
authors[2] # => "J.R.R. Tolkien"
authors[3] # => "Hanif Kureishi"