buffer: add .from(), .alloc() and .allocUnsafe()

Several changes:

* Soft-Deprecate Buffer() constructors
* Add `Buffer.from()`, `Buffer.alloc()`, and `Buffer.allocUnsafe()`
* Add `--zero-fill-buffers` command line option
* Add byteOffset and length to `new Buffer(arrayBuffer)` constructor
* buffer.fill('') previously had no effect, now zero-fills
* Update the docs

PR-URL: https://github.com/nodejs/node/pull/4682
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>

1 files changed, 4 insertions, 5 deletions

diff --git a/test/parallel/test-dgram-send-default-host.js b/test/parallel/test-dgram-send-default-host.js
index 0d49322513..e6b6d7c9b4 100644
--- a/test/parallel/test-dgram-send-default-host.js
+++ b/test/parallel/test-dgram-send-default-host.js
@@ -6,11 +6,10 @@ const dgram = require('dgram');
 
 const client = dgram.createSocket('udp4');
 
-const toSend = [new Buffer(256), new Buffer(256), new Buffer(256), 'hello'];
-
-toSend[0].fill('x');
-toSend[1].fill('y');
-toSend[2].fill('z');
+const toSend = [Buffer.alloc(256, 'x'),
+                Buffer.alloc(256, 'y'),
+                Buffer.alloc(256, 'z'),
+                'hello'];
 
 client.on('listening', function() {
   client.send(toSend[0], 0, toSend[0].length, common.PORT);