ruby_tricks.rb

# Present
"brain".present?
#=> true

"".present?
#=> false


#Hash#fetch
items = { :apples => 2, :oranges => 3 }
#=> items = {:apples=>2, :oranges=>3}

items.fetch(:apples)
#=> 2

items.fetch(:bananas) { |key| "We don't carry #{key}!"}
#=> We don't carry bananas!


# Hash#new with a block
smash = Hash.new { |hash, key| hash[key] = "a #{key} just got SMASHED!" }
#=> {}

smash[:plum] = "cannot smash."
#=> {:plum=>"cannot smash."}

smash[:watermelon]
#=> {:plum=>"cannot smash.", :watermelon=>"a watermelon just got SMASHED!"}