Tour of Go 2.0

Map literals continued

When the value type in a map literal is a named type, you can drop the type name from each element. Go can infer it.

Compare the previous example’s Vertex{...} with this one’s {...} — same result, less noise.

main.go ▶ Run in Playground 
package main

import "fmt"

type Vertex struct {
	Lat, Long float64
}

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

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