wnuqui

# send following line to irb and see the result
a = 1, b = 2*5

# perhaps this is better
a = 1, (b = 2*5)

wnuqui

i = "1i"

i.to_i # => 1
Integer(i) # => ArgumentError: invalid value for Integer(): "1i"


f = "1.2f"

f.to_f # => 1.2
Float(f) # => ArgumentError: invalid value for Float(): "1.2f"

wnuqui

class A
  def self.constant
    [1, 2, 3]
  end

  B = constant and nil
end

wnuqui

class A
  def b
    data = [1, 2, 3]
    def data.foo!
      self.sample
    end
    data
  end
end