How to use error.Is to check if the error is strconv.NumError

Question content

I have this error

The error type is ParseInt. How to check this error I'm assuming I would use errors.Is but not sure what I would do in this case

Correct Answer

https ://pkg.go.dev/[email protected]#numerror

type numerror struct {
    func string // the failing function (parsebool, parseint, parseuint, parsefloat, parsecomplex)
    num  string // the input
    err  error  // the reason the conversion failed (e.g. errrange, errsyntax, etc.)
}

The error type is parseint.

"parseint" is the name of the "failure function", a function that returns an error. The actual error type is *strconv.numerror. You can check it and the function name like this:

if e, ok := err.(*strconv.NumError); ok && e.Func == "ParseInt" {
    // do xyz
}

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