use the included_modules method to discover what modules a class uses : Module Reflection « Reflection « Ruby

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Ruby » Reflection » Module Reflection   use the included_modules method to discover what modules a class uses puts Object.included_modules # => [Kernel] puts Numeric.included_modules # => [Comparable, Kernel] puts Integer.included_modules # => [Precision, Comparable, Kernel] puts Fixnum.included_modules # => [Precision, Comparable, Kernel]   Related examples in the same category 1.  Discover the names of any of the included modules of an instance or its class using the included_modules method from Module.

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