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-child-process-spawnsync-input.js b/test/parallel/test-child-process-spawnsync-input.js
index 0116f09292..c8c63e4f93 100644
--- a/test/parallel/test-child-process-spawnsync-input.js
+++ b/test/parallel/test-child-process-spawnsync-input.js
@@ -9,8 +9,8 @@ const msgOut = 'this is stdout';
 const msgErr = 'this is stderr';
 
 // this is actually not os.EOL?
-const msgOutBuf = new Buffer(msgOut + '\n');
-const msgErrBuf = new Buffer(msgErr + '\n');
+const msgOutBuf = Buffer.from(msgOut + '\n');
+const msgErrBuf = Buffer.from(msgErr + '\n');
 
 const args = [
   '-e',
@@ -71,14 +71,14 @@ assert.strictEqual(ret.stdout.toString('utf8'), options.input);
 assert.strictEqual(ret.stderr.toString('utf8'), '');
 
 options = {
-  input: new Buffer('hello world')
+  input: Buffer.from('hello world')
 };
 
 ret = spawnSync('cat', [], options);
 
 checkSpawnSyncRet(ret);
 assert.deepEqual(ret.stdout, options.input);
-assert.deepEqual(ret.stderr, new Buffer(''));
+assert.deepEqual(ret.stderr, Buffer.from(''));
 
 verifyBufOutput(spawnSync(process.execPath, args));