“Value polymorphism”, simple explanation with examples

“Value polymorphism”, simple explanation with examples

At first I thought this would be a post that would interest only one topic map person that I know. But upon reading the entire post, I decided it might interest two.

What pushed me over the edge was:

Thus by merely specifying the return type we have effectively generated a parser. An invalid string will produce an error:

That is a very powerful mechanism to use with processing values returned in processing a topic map (or data about to be included in a topic map).

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