mongodb golang check collection exists

I need to check if a collection exists.

I have created the following function:

func ExitsCollection(name string) bool {

	var exists bool = false

	names, err := cliente.CollectionNames()
	if err != nil {
		log.Println("[-]I cannot retrieve the list of collections")
	}

	// Simply search in the names
	for _, name := range names {
		if name == name {
			log.Printf("[+]The collection already exists!")
			exists = true
			break
		}
	}

	if !exists {
		log.Println("[+] The collection does not exist")
	}

	return exists
}

In order to connect I use the next function:

func ConectaBD() {

	cliente_local, err := mongo.NewClient(options.Client().ApplyURI(cadena_conexion))
	if err != nil {
		log.Fatal(err)
	}

	ctx, cancelar = context.WithTimeout(context.Background(), 10*time.Second)
	err = cliente_local.Connect(ctx)
	if err != nil {
		log.Fatal(err)
	}
	defer cancelar()

	mongo_cliente = cliente_local.Database(DATABASE)

	log.Println("[+]Connected to MongoDB Atlas")

}

I use the following variables:

var cliente_local *mongo.Client
var mongo_cliente *mongo.Database
var coleccion *mongo.Collection
var ctx context.Context
var cancelar context.CancelFunc

The problem is the next sentence:

names, err := cliente.CollectionNames()

What type of data or How do I can use the method CollectionNames()?

Does anyone have a sample source code?

Thanks in advance

===========================================

thank you all for your help!!!
I have created another question for session management:

https://stackoverflow.com/questions/70505598/how-i-get-a-session-in-mongodb-with-golang

Database.CollectionNames() returns the collection names present in the db database. The return type is slice so you need to check if your collection is listed or not.

Please check the official docs : https://pkg.go.dev/gopkg.in/mgo.v2#Database.CollectionNames

sess := ... // obtain session
db := sess.DB("") // Get db, use db name if not given in connection url

names, err := db.CollectionNames()
if err != nil {
    // Handle error
    log.Printf("Failed to get coll names: %v", err)
    return
}

// Simply search in the names slice, e.g.
for _, name := range names {
    if name == "collectionToCheck" {
        log.Printf("The collection exists!")
        break
    }
}

For better understanding refer this link : https://stackoverflow.com/questions/46293070/how-to-check-if-collection-exists-or-not-mongodb-golang