nc, err := nats.Connect("demo.nats.io")
if err != nil {
	log.Fatal(err)
}
defer nc.Close()

// Sync Subscription
sub, err := nc.SubscribeSync("updates")
if err != nil {
	log.Fatal(err)
}
if err := sub.Unsubscribe(); err != nil {
	log.Fatal(err)
}

// Async Subscription
sub, err = nc.Subscribe("updates", func(_ *nats.Msg) {})
if err != nil {
	log.Fatal(err)
}
if err := sub.Unsubscribe(); err != nil {
	log.Fatal(err)
}

Connection nc = Nats.connect("nats://demo.nats.io:4222");
Dispatcher d = nc.createDispatcher((msg) -> {
    String str = new String(msg.getData(), StandardCharsets.UTF_8);
    System.out.println(str);
});

// Sync Subscription
Subscription sub = nc.subscribe("updates");
sub.unsubscribe();

// Async Subscription
d.subscribe("updates");
d.unsubscribe("updates");

// Close the connection
nc.close();

let nc = NATS.connect({
    url: "nats://demo.nats.io:4222"
});
// set up a subscription to process a request
let sub = nc.subscribe(NATS.createInbox(), (msg, reply) => {
    if (msg.reply) {
        nc.publish(reply, new Date().toLocaleTimeString());
    }
});

// without arguments the subscription will cancel when the server receives it
// you can also specify how many messages are expected by the subscription
nc.unsubscribe(sub);

nc = NATS()

await nc.connect(servers=["nats://demo.nats.io:4222"])

future = asyncio.Future()

async def cb(msg):
  nonlocal future
  future.set_result(msg)

sid = await nc.subscribe("updates", cb=cb)
await nc.publish("updates", b'All is Well')

# Remove interest in subject
await nc.unsubscribe(sid)

# Won't be received...
await nc.publish("updates", b'...')

require 'nats/client'
require 'fiber'

NATS.start(servers:["nats://127.0.0.1:4222"]) do |nc|
  Fiber.new do
    f = Fiber.current

    sid = nc.subscribe("time") do |msg, reply|
      f.resume Time.now
    end

    nc.publish("time", 'What is the time?', NATS.create_inbox)

    # Use the response
    msg = Fiber.yield
    puts "Reply: #{msg}"

    nc.unsubscribe(sid)

    # Won't be received
    nc.publish("time", 'What is the time?', NATS.create_inbox)

  end.resume
end

// set up a subscription to process a request
let sub = await nc.subscribe(createInbox(), (err, msg) => {
    if (msg.reply) {
        nc.publish(msg.reply, new Date().toLocaleTimeString());
    } else {
        t.log('got a request for the time, but no reply subject was set.');
    }
});

// without arguments the subscription will cancel when the server receives it
// you can also specify how many messages are expected by the subscription
sub.unsubscribe();