Empty_Interface

• Empty interface specifies no methods.
• We can assign any value to the empty interface.
• Empty interface gives no knowledge of about data coming in.
• Benefits of static typed language is nullified.
• Neet to use reflect library to turn arbitrary(隨意的) structs into specific type.
• Prefer to use specific data type.
• Create an interface with some specific methods that we need.

Exercises

https://go.dev/play/p/DLKPlO4JOfe

(42, int) (hello, string)

package main

import "fmt"

func main() {
    describe(42)
    describe("hello")
}

func describe(i interface{}) {
    fmt.Printf("(%v, %T)\n", i, i)
}