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You can learn from the Go codebase to get a feel of why this is useful:

https://github.com/golang/go/blob/master/src/cmd/go/internal... https://github.com/golang/go/blob/master/src/io/fs/fs.go#L26... https://github.com/golang/go/blob/master/src/errors/wrap.go#... https://github.com/golang/go/blob/master/src/go/parser/resol...

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If the interface check fails, does the code panic or does the `ok' value just get set to false?

If `ok' gets set to false, that seems optimal. Pretty neat, in fact, what other language permits such low-key, easy runtime interface checks?

this will panic:

v := hello.(world)

this never panic:

v, ok := hello.(world)

and yes, its awesome. people rag on Go because BLARG ERRORS BOILERPLATE, but if you can get over that Go is not Python/JavaScript, you're left with a simple powerful language

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