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hot_swappable_methods

⚡ Hot-Swap Methods with Refinements and define_method​

Refinements let you apply scoped patches without altering global behavior. Combine Module#refine with define_method to generate hot-swappable implementations that activate only under using. This is invaluable for targeted monkey-patching, testing, or feature toggles.

module StringPatch
  refine String do
    define_method(:reverse) do
      "[patched] #{super()}"
    end
  end
end

using StringPatch
puts "abc".reverse
# => "[patched] cba"
# Outside this scope, String#reverse remains untouched.