How Can I Get the Name of a Go Function's Parameter?

Parameter Name Retrieval in Go

Consider the following Go method:

func (t *T) TMethod(data *testData) (interface{}, *error) {
    ...
}

If you desire to determine the name of the parameter (i.e., data), attempting to use the following code will result in retrieving the structure name:

reflect.ValueOf(T).MethodByName("TMethod").Type.In(0).Elem().Name()

Regrettably, obtaining the name of a function or method's parameter is not feasible in Go. This is primarily because the parameter names are inconsequential when calling such functions. Instead, the focus lies on their types and order. Moreover, it is permissible to define functions or methods without assigning names to their parameters, as seen below:

func NamelessParams(int, string) {}

For more detailed information regarding this aspect, please refer to the discussion on Is unnamed arguments a thing in Go?

Alternatively, if you aim to establish a framework that allows the passing of values to parameters with designated names (for instance, mapping API parameters to Go function/method parameters), consider employing a struct or map. This is because structs and maps permit the retrieval of named fields and keys, respectively, via methods such as Value.FieldByName() and Type.FieldByName().

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