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Metho allows you to easily and safely add methods in the form of dynamic properties to any object. If used to extend native types, it allows for the construction of JS expressions with a somewhat unique syntax. The techniques used could also be generalized into a flexible tool that could make many interesting syntax constructs possible. Metho is a relatively new addition to JS but is extremely useful. It's generally accepted that modifying these native types is not a good idea as there is no guarantee your changes will not conflict with other libraries or future changes to JS.