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, 4 deletions

diff --git a/test/parallel/test-buffer-concat.js b/test/parallel/test-buffer-concat.js
index 7aec811720..bc628e656b 100644
--- a/test/parallel/test-buffer-concat.js
+++ b/test/parallel/test-buffer-concat.js
@@ -3,9 +3,9 @@ require('../common');
 var assert = require('assert');
 
 var zero = [];
-var one  = [ new Buffer('asdf') ];
+var one  = [ Buffer.from('asdf') ];
 var long = [];
-for (var i = 0; i < 10; i++) long.push(new Buffer('asdf'));
+for (var i = 0; i < 10; i++) long.push(Buffer.from('asdf'));
 
 var flatZero = Buffer.concat(zero);
 var flatOne = Buffer.concat(one);
@@ -22,10 +22,10 @@ assert(flatLongLen.toString() === (new Array(10 + 1).join('asdf')));
 
 assertWrongList();
 assertWrongList(null);
-assertWrongList(new Buffer('hello'));
+assertWrongList(Buffer.from('hello'));
 assertWrongList([42]);
 assertWrongList(['hello', 'world']);
-assertWrongList(['hello', new Buffer('world')]);
+assertWrongList(['hello', Buffer.from('world')]);
 
 function assertWrongList(value) {
   assert.throws(function() {