Why Does My Compiler Throw an \"Excessive Arguments\" Error When Passing a DataResponse Struct to JSON()?

Compiler Issues with DataResponse Struct Arguments

Despite providing all necessary arguments, the compiler throws an error message about excessive arguments when passing a DataResponse struct as a parameter to JSON().

Problem

The provided code excerpt attempts to create an instance of the DataResponse struct and pass it as a parameter to the JSON() function. However, the compiler raises an error indicating too many arguments are given.

<code class="go">type DataResponse struct {
    Status int         `json:"status"`
    Data   interface{} `json:"data"`
}

func GetUser(rw http.ResponseWriter, req *http.Request, ps httprouter.Params) {
    user := models.User{}

    resp := DataResponse(200, user)
    JSON(rw, resp)
}</code>

Solution

The error occurs due to incorrect syntax for struct initialization. The spaces around the curly braces signify a function call instead of a struct initialization using curly braces. To resolve the issue, change the code as follows:

<code class="go">resp := DataResponse{200, user}</code>

Using curly braces ensures that the code correctly initializes the DataResponse struct with the provided arguments. The compiler will no longer complain about too many arguments.

This modification ensures that the compiler accurately identifies the code as struct initialization and allows the DataResponse struct to be correctly used as a parameter for the JSON() function.

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