Update async.md

developing-with-nats/intro-3/async.md

@@ -4,5 +4,113 @@ Asynchronous subscriptions use callbacks of some form to notify an application w
 
 The following example subscribes to the subject `updates` and handles the incoming messages:
 
-!INCLUDE "../../\_examples/subscribe\_async.html"
+{% tabs %}
+{% tab title="Go" %}
+```go
+nc, err := nats.Connect("demo.nats.io")
+if err != nil {
+	log.Fatal(err)
+}
+defer nc.Close()
+
+// Use a WaitGroup to wait for a message to arrive
+wg := sync.WaitGroup{}
+wg.Add(1)
+
+// Subscribe
+if _, err := nc.Subscribe("updates", func(m *nats.Msg) {
+	wg.Done()
+}); err != nil {
+	log.Fatal(err)
+}
+
+// Wait for a message to come in
+wg.Wait()
+```
+{% endtab %}
+
+{% tab title="Java" %}
+```java
+Connection nc = Nats.connect("nats://demo.nats.io:4222");
+
+// Use a latch to wait for a message to arrive
+CountDownLatch latch = new CountDownLatch(1);
+
+// Create a dispatcher and inline message handler
+Dispatcher d = nc.createDispatcher((msg) -> {
+    String str = new String(msg.getData(), StandardCharsets.UTF_8);
+    System.out.println(str);
+    latch.countDown();
+});
+
+// Subscribe
+d.subscribe("updates");
+
+// Wait for a message to come in
+latch.await(); 
+
+// Close the connection
+nc.close();
+```
+{% endtab %}
+
+{% tab title="JavaScript" %}
+```javascript
+let nc = NATS.connect({
+    url: "nats://demo.nats.io:4222"
+});
+nc.subscribe("updates", (msg) => {
+    t.log(msg);
+});
+```
+{% endtab %}
+
+{% tab title="Python" %}
+```python
+nc = NATS()
+
+await nc.connect(servers=["nats://demo.nats.io:4222"])
+
+future = asyncio.Future()
+
+async def cb(msg):
+  nonlocal future
+  future.set_result(msg)
+
+await nc.subscribe("updates", cb=cb)
+await nc.publish("updates", b'All is Well')
+await nc.flush()
+
+# Wait for message to come in
+msg = await asyncio.wait_for(future, 1)
+```
+{% endtab %}
+
+{% tab title="Ruby" %}
+```ruby
+require 'nats/client'
+
+NATS.start(servers:["nats://127.0.0.1:4222"]) do |nc|
+  nc.subscribe("updates") do |msg|
+    puts msg
+    nc.close
+  end
+
+  nc.publish("updates", "All is Well")
+end
+```
+{% endtab %}
+
+{% tab title="TypeScript" %}
+```typescript
+nc.subscribe("updates", (err, msg) => {
+    if(err) {
+        console.log('error', err);
+    } else {
+        t.log(msg.data);
+    }
+});
+```
+{% endtab %}
+{% endtabs %}