Aliasing methods when a module is included

"abcd".reverse # => "dcba"
"abcd".invert  # => NoMethodError

module Reversable
  # klass == String here
  def self.included(klass) = klass.alias_method(:invert, :reverse)
end

When the Reversable module is included in a class, then the invert alias is automatically added to the including class through the included hook method

String.include Reversable # triggers a call to Reversable.included(String)

"abcd".reverse # => "dcba"
"abcd".invert  # => "dcba"

Aliasing methods when a module is included

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Aliasing methods when a module is included

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