Throw an error about a wrong parameter of a function - with the name of this parameter Topic is solved

[john_c]

If you run the following Hotstring() example,

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Hotstring(":*:btw", "by the way", "WrongArg")

there will be thrown an error:

Error: Parameter #3 invalid.
Specifically: WrongArg

How to achieve the same effect (that is, to report the name of the wrong argument) with a custom function?
I know there is A_ThisFunc variable, but I don't know about anything like A_ThisFuncArgs.

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func(parameter) {
    if parameter not in foo,bar,baz
        throw
    else
        return "success"
}

func("aaa")  ; Should throw an error

[boiler]

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func(parameter) {
	if parameter not in foo,bar,baz
		throw, "Parameter is invalid.`nSpecifically: " parameter
	return "success"
}

func("aaa")

[john_c]

Duh. Thanks.

[A_AhkUser]

(...) How to achieve the same effect (...)

I know your question is more about finding a way to report the name of the wrong argument but I should also mention that you can use the exception function to mimic the way an error is thrown when you call the Hotstring built-in function passing it a wrong argument (in particular, incriminate the line that actually called the function, and not a line in the arcanes of the function):

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func(parameter) {
    if parameter not in foo,bar,baz
        throw Exception("Parameter #1 invalid.", -1, parameter)
    else return "success"
}
; try func("aaa")
; catch exception {
	; MsgBox, 64,, % exception.extra
; }
func("aaa")

A_AhkUser

[john_c]

@A_AhkUser Thanks a lot, useful :-)