blocks, procs, lambdas, and methods

things.rb

class String
  def fuck_yea(&block)
    each_char do |c|
      p yield(c)
    end
  end

  def fuck_yea_with_callback(callback)
    each_char do |c|
      callback.call(c)
    end
  end

  def append_hahaha
    self + "hahaha"
  end
end

# This is a block
"word".fuck_yea { |c| c + "hahaha" }

# This is a function on instances
"bird".fuck_yea(&:append_hahaha)

# this is a proc
"word".fuck_yea_with_callback(Proc.new { |c, b, a| c + "hahaha" })

# this is a lambda, you'l notice it doesnt like having multiple arguments
"word".fuck_yea_with_callback(lambda { |c, b, a| c + "hahaha" })