Tour of Go 2.0

Map literals

Map literals let you declare and populate a map in one shot. The syntax looks like struct literals, but keys are required — no skipping them.

Try it: Add a third entry to the map and verify it prints correctly.

main.go ▶ Run in Playground 
package main

import "fmt"

type Vertex struct {
	Lat, Long float64
}

var m = map[string]Vertex{
	"Bell Labs": Vertex{
		40.68433, -74.39967,
	},
	"Google": Vertex{
		37.42202, -122.08408,
	},
}

func main() {
	fmt.Println(m)
}