Add slice for converting to ArrayBuffer

The .buffer property is an ArrayBuffer, but it is not necessarily the
same length as the original buffer. This adds further documentation to
the README to flesh out converting a Buffer to an ArrayBuffer.

diff --git a/README.md b/README.md
index 6acfd222eafd4361c31d8224963b439033cd4d42..e92510072019c2229aebb997654b94c54a00bf70 100644 (file)
--- a/README.md
+++ b/README.md
@@ -138,9 +138,13 @@ var buffer = Buffer.from(arrayBuffer)
 To convert a `Buffer` to an `ArrayBuffer`, use the `.buffer` property (which is present on all `Uint8Array` objects):
 
 ```js
-var arrayBuffer = buffer.buffer
+var arrayBuffer = buffer.buffer.slice(
+  buffer.byteOffset, buffer.byteOffset + buffer.byteLength
+)
 ```
 
+Alternatively, use the [`to-arraybuffer`](https://www.npmjs.com/package/to-arraybuffer) module.
+
 ## performance
 
 See perf tests in `/perf`.