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A Default Identity Value for Programming

https://michaelfeathers.silvrback.com/a-default-identity-value-for-programming

by farginay • 13 years ago

2 2 13 years ago

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npryce• 13 years ago

J has a similar feature: when applied to an empty array, /+ returns 0 and /* returns 1.

J doesn't have user-defined types. In a language with user-defined types, you would probably have to declare which operations are monoids.

dvberkel• 13 years ago

I would concur with npryce. I your structure would adhere to the monoid interface and the default value could be cast automatically to the corresponding identity this will work. It wouldn't even break mathematics

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