Programming Ruby 3.3

Defining a Method

As we’ve seen, a method is defined using the keyword def.

The keyword def creates a method and returns the name of the method as a symbol, which, as we saw in ​Specifying Access Control​, allows us to put decorator methods like private before the declaration.

The body of a method contains normal Ruby expressions. The return value of a method is the value of the last expression executed or the argument of an explicit return expression.

An important fact about def is that if you define a method a second time, Ruby won’t raise an error, it’ll print a warning, and then it’ll redefine the method using the second definition:

class Batman
  def who_is_robin
    puts "Dick Grayson"
  end

  def who_is_robin
 puts  ...