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, 2 insertions, 2 deletions

diff --git a/test/pummel/test-regress-GH-814.js b/test/pummel/test-regress-GH-814.js
index 820903d688..031276efa6 100644
--- a/test/pummel/test-regress-GH-814.js
+++ b/test/pummel/test-regress-GH-814.js
@@ -2,7 +2,7 @@
 // Flags: --expose_gc
 
 function newBuffer(size, value) {
-  var buffer = new Buffer(size);
+  var buffer = Buffer.allocUnsafe(size);
   while (size--) {
     buffer[size] = value;
   }
@@ -39,7 +39,7 @@ var timeToQuit = Date.now() + 8e3; //Test during no more than this seconds.
   if (PASS) {
     fs.write(testFileFD, newBuffer(kBufSize, 0x61), 0, kBufSize, -1, cb);
     gc();
-    var nuBuf = new Buffer(kBufSize);
+    var nuBuf = Buffer.allocUnsafe(kBufSize);
     neverWrittenBuffer.copy(nuBuf);
     if (bufPool.push(nuBuf) > 100) {
       bufPool.length = 0;