From 5df31ca256a8232bdde01dbd3a72ce79669b6385 Mon Sep 17 00:00:00 2001
From: Jaco Greeff <jacogr@gmail.com>
Date: Fri, 1 Feb 2019 12:06:27 +0100
Subject: [PATCH] Unsub from newHead snippet (#669)

---
 packages/app-js/src/snippets/newHead.ts | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/packages/app-js/src/snippets/newHead.ts b/packages/app-js/src/snippets/newHead.ts
index 76f608255f..01df5da501 100644
--- a/packages/app-js/src/snippets/newHead.ts
+++ b/packages/app-js/src/snippets/newHead.ts
@@ -2,7 +2,13 @@
 // This software may be modified and distributed under the terms
 // of the Apache-2.0 license. See the LICENSE file for details.
 
-export default `// subscribe to new headers, printing the full result
-api.rpc.chain.subscribeNewHead((header) => {
+export default `// subscribe to new headers, printing the full info for 5
+let count = 0;
+const unsub = await api.rpc.chain.subscribeNewHead((header) => {
   console.log(\`#\${header.blockNumber}:\`, header);
+
+  if (++count === 5) {
+    console.log('5 headers retrieved, unsubscribing');
+    unsub();
+  }
 });`;