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Type assertion in Go Programming Language

Type assertion is a way to retrieve dynamic value from interface type value.

Example

package main

import (
	"fmt"
	"reflect"
)

func main() {
	var anyType interface{}
	anyType = "Canada"
	fmt.Println("Variable type:", reflect.TypeOf(anyType))

	str, ok := anyType.(string) // Type assertion form.
	if ok {
		fmt.Println("Variable type:", reflect.TypeOf(str))
	} else {
		fmt.Println("Variable is not String.")
	}

	var intType = 100
	anyType = intType
	fmt.Println("Variable type:", reflect.TypeOf(anyType))

	var anotherType interface{}
  anotherType = anyType
	fmt.Println("Variable type:", reflect.TypeOf(anotherType))
}
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