Comment on A Default Identity Value for ProgrammingComments−npryce12yJ 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.
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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.