types-and-type-assertions

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Roadmap info from roadmap website

Types and type assertions

Type assertions in Golang provide access to the exact type of variable of an interface.

• @official@Types Assertions

package main

import "fmt"

func main() {
 var i interface{} = "hello"

 s := i.(string)
 fmt.Println(s)

 s, ok := i.(string)
 fmt.Println(s, ok)

 f, ok := i.(float64)
 fmt.Println(f, ok)

 f = i.(float64) // panic
 fmt.Println(f)
}