Type conversion (with and without panic)

test.go

package main

import "fmt"

func test() interface{} {
	return 123
}

func main() {
	// no panic
	s1, ok := test().(string)
	if ok {
		fmt.Println("result 1: ", s1)
	} else {
		fmt.Println("not a string")
	}

	// panic
	s2, _ := test().(string)
	fmt.Println("result 2: ", s2)
}