stream: Use class for write buffer entries

lib/_stream_writable.js

@@ -32,6 +32,12 @@ var Stream = require('stream');
 
 util.inherits(Writable, Stream);
 
+function WriteReq(chunk, encoding, cb) {
+  this.chunk = chunk;
+  this.encoding = encoding;
+  this.callback = cb;
+}
+
 function WritableState(options, stream) {
   options = options || {};
 
@@ -190,7 +196,7 @@ function writeOrBuffer(stream, state, chunk, encoding, cb) {
   state.needDrain = !ret;
 
   if (state.writing)
-    state.buffer.push([chunk, encoding, cb]);
+    state.buffer.push(new WriteReq(chunk, encoding, cb));
   else
     doWrite(stream, state, len, chunk, encoding, cb);
 
@@ -268,9 +274,9 @@ function clearBuffer(stream, state) {
 
   for (var c = 0; c < state.buffer.length; c++) {
     var entry = state.buffer[c];
-    var chunk = entry[0];
-    var encoding = entry[1];
-    var cb = entry[2];
+    var chunk = entry.chunk;
+    var encoding = entry.encoding;
+    var cb = entry.callback;
     var len = state.objectMode ? 1 : chunk.length;
 
     doWrite(stream, state, len, chunk, encoding, cb);

test/simple/test-stream2-transform.js

@@ -82,7 +82,7 @@ test('writable side consumption', function(t) {
   t.equal(transformed, 10);
   t.equal(tx._transformState.writechunk.length, 5);
   t.same(tx._writableState.buffer.map(function(c) {
-    return c[0].length;
+    return c.chunk.length;
   }), [6, 7, 8, 9, 10]);
 
   t.end();