SyncMapOps: базовое API sync.Map

func syncMapOps() (loaded string, afterDelete bool, count int) {
	var m sync.Map
	m.Store("key", "value")
	v, ok := m.Load("key")
	if ok {
		loaded = v.(string)
	}
	m.Delete("key")
	_, afterDelete = m.Load("key")
	m.Store("a", 1)
	m.Store("b", 2)
	m.Range(func(k, v any) bool {
		count++
		return true
	})
	return
}