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, 3 insertions, 3 deletions

diff --git a/lib/dgram.js b/lib/dgram.js
index 4b6e7fa6e2..0c92e361c0 100644
--- a/lib/dgram.js
+++ b/lib/dgram.js
@@ -252,7 +252,7 @@ Socket.prototype.sendto = function(buffer,
 
 function sliceBuffer(buffer, offset, length) {
   if (typeof buffer === 'string')
-    buffer = new Buffer(buffer);
+    buffer = Buffer.from(buffer);
   else if (!(buffer instanceof Buffer))
     throw new TypeError('First argument must be a buffer or string');
 
@@ -267,7 +267,7 @@ function fixBuffer(buffer) {
   for (var i = 0, l = buffer.length; i < l; i++) {
     var buf = buffer[i];
     if (typeof buf === 'string')
-      buffer[i] = new Buffer(buf);
+      buffer[i] = Buffer.from(buf);
     else if (!(buf instanceof Buffer))
       return false;
   }
@@ -318,7 +318,7 @@ Socket.prototype.send = function(buffer,
 
   if (!Array.isArray(buffer)) {
     if (typeof buffer === 'string') {
-      buffer = [ new Buffer(buffer) ];
+      buffer = [ Buffer.from(buffer) ];
     } else if (!(buffer instanceof Buffer)) {
       throw new TypeError('First argument must be a buffer or a string');
     } else {