Intro to Ruby - 03 - Arrays & Hashes

Arrays.rb

# Basic Array
my_array = [1, 2, 3, 4, 5]

# Ruby arrays are zero-based arrays, 
# meaning the first element is at index 0
my_array[1] # => 2
my_array[0] # => 1

# Except when you do negative indexes
my_array[-2] # => 4

# Adding items to an Array
my_array = [] # Creates an empty array
my_array << 2 # => [2]
my_array.push("A String") # => [2, "A String"]

# Removing an item
my_array.pop  # => "A String"
my_array # => [2]

Hashes.rb

# Basic Hash
my_hash = { 'name' => "Michael Koby", 'age' => 32, 'websites' => ["http://www.codecasts.tv", "http://www.mkoby.com"] }

# Access by key
my_hash['age'] # => 32

# Using Ruby symbols for key names, Ruby 1.9 and above
my_hash = { :name => "Michael Koby", :age => 32, :websites => ["http://www.codecasts.tv", "http://www.mkoby.com"] }

# Access key by symbol
my_hash[:age] # => 32