Radar · Go · Archive · Week 28 · Jul 6 – 12, 2026

maps: add Same func

Nice to knowstdlib

What changed

The maps package now has a Same generic function that reports whether two maps refer to the same underlying data structure.

Production impact

The source does not say.

Try it

Use maps.Same(m1, m2) to compare map identities.

Source

github.com/golang/go/issues/78456

// This does not compile until the Same function is shipped in Go 1.28.
package main

import (
	"fmt"
	"maps"
)

func main() {
	s := map[int]struct{}{1: {}, 2: {}}
	t := s
	u := map[int]struct{}{1: {}, 2: {}}

	fmt.Println(maps.Same(s, t)) // true
	fmt.Println(maps.Same(s, u)) // false
}

Written by gpt-oss-20b from the linked source · claims checked against the sources · archive, not individually reviewed