(), [], and {} ... oh my!

example.rb

def function(param)
  puts param
end

def function param
  puts param
end

def function ; puts param ; end

# Arrays

names = Array.new('frank', 'danny', 'erik', 'ryan')

names = [ 'frank', 'danny', 'erik', 'shawn']

puts names[0]
puts names.first
puts names[1]
puts names[-1]
puts names.last

# Hash

favorite_colors = { 'frank' => 'blue', 'danny' => 'green' }

same_favorite_colors = Hash.new
same_favorite_colors['frank'] = blue
same_favorite_colors['danny'] = green

# Blocks

[ 'erik', 'kevin' ].each {|name| puts name }

[ 'erik', 'kevin' ].each do |name|
  puts name
end

name_array = [ 'erik', 'kevin' ]

name_array.each do |name|
  puts name
end


# Ranges

childhood = 3..12

childhood.each {|year| puts "When I was #{year}, it was a very good year."}

# Often times used like:

(3..12).each {|year| puts "When I was #{year}, it was a very good year."}

hash.rb

{ :name => 'Frank', :age => 33, :home => 'Seattle' }.each {|key,value| puts "The key #{key} is associated with the value #{value}" }

{ :name => 'Frank', :age => 33, :home => 'Seattle' }.keys.each {|key| puts "Let me show you key: #{key}" }

{ :name => 'Frank', :age => 33, :home => 'Seattle' }.keys.each {|key| puts "Let me show you value: #{value}" }