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Puzzle 11 Explanation: Go Log

Understand the concept of log in Go.

We'll cover the following...

Try it yourself

Try executing the code below to see the result.

Go (1.16.5)
package main
import (
	"fmt"
	"time"
)
// Log is a log message
type Log struct {
	Message string
	time.Time
}
func main() {
	ts := time.Date(2009, 11, 10, 0, 0, 0, 0, time.UTC)
	log := Log{"Hello", ts}
	fmt.Printf("%v\n", log)
}

Explanation

The %v verb will print all the struct fields.

Go (1.16.5)
package main
import (
	"fmt"
)
// Point is a 2D point
type Point struct {
	X int
	Y int
}
func main() {
	p := Point{1, 2}
	fmt.Printf("%v\n", p) // {1 2}
}

We’d expect the teaser code to print{Hello 2009-11-10 00:00:00 +0000 UTC}.

However, it doesn’t, due to the way the Log struct is defined. In line 11 there is a field with no name, just a type. This is called ...