验证reflect.Type的其他方法int和float64

Question

In golang, a number in JSON message is always parsed into float64. In order to detect if it is actually integer, I am using reflect.TypeOf() to check its type. Unfortunately there is no constant that represents reflect.Type.

intType := reflect.TypeOf(0)
floatType := reflect.TypeOf(0.0)
myType := reflect.TypeOf(myVar)
if myType == intType {
    // do something
}

Is there more elegant solution instead of using 0 or 0.0 to get reflect.Type?

Answer 1

You may also use the Value.Kind() or Type.Kind() method whose possible values are listed as constants in the reflect package, at the doc of the Kind type.

myType := reflect.TypeOf(myVar)
if k := myType.Kind(); k == reflect.Int {
    fmt.Println("It's of type int")
} else if k == reflect.Float64 {
    fmt.Println("It's of type float64")
}

You can also use it in a switch:

switch myType.Kind() {
case reflect.Int:
    fmt.Println("int")
case reflect.Float64:
    fmt.Println("float64")
default:
    fmt.Println("Some other type")
}

Note that both reflect.Type and reflect.Value has a Kind() method, so you can use it if you start with reflect.ValueOf(myVar) and also if you start with reflect.TypeOf(myVar).