Why Am I Getting 'not enough arguments in call to method expression JSONParser.Parse'?

Insufficient Arguments for Method Expression: "JSONParser.Parse"

While attempting to utilize the JSONParser package, you may encounter the error "not enough arguments in call to method expression JSONParser.Parse." This error suggests that an insufficient number of arguments were provided when invoking the Parse method.

The issue arises because the Parse method is defined as an instance method of the JSONParser type. In other words, it requires an instance of JSONParser to be invoked. In your main function, however, you are attempting to call the method directly from the package scope, without first instantiating a JSONParser object.

To resolve this issue, you need to create an instance of JSONParser and then call the Parse method on that instance. For example:

func main() {
    var in []byte
    jp := JSONParser{}
    actual, err2 := jp.Parse(in)
}

By creating an instance of JSONParser (jp) and then invoking the Parse method on that instance, you provide the necessary argument and successfully resolve the error.

The confusing wording of the error message can be attributed to the fact that the receiver (the entity within parentheses on the left-hand side of the function name) is treated like any other function argument. Therefore, the error message reflects that an insufficient number of arguments, including the receiver, were provided for the method invocation.

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