Hands-On High Performance with Go

Types

Being able to tell the type of a variable is important in Go. In our example, we can validate the fact that a string type is, in fact, a string, as shown in the following code block:

package mainimport (    "fmt"    "reflect")func main() {    var foo string = "Hi Go!"    fooType := reflect.TypeOf(foo)    fmt.Println("Foo type: ", fooType)}

The output from our program will show us that the reflection type will accurately derive the foo string type:

Although this example is simple, it's important to understand the underlying principle: if, instead of validating the string, we are looking at an incoming network call or the return from an external library ...