buffer: default to UTF8 in byteLength()

tomgco · rvagg · commit ab5b529dd2ac · 2015-12-05T16:31:17.000+11:00
If an undefined encoding is passed to byteLength(), assume that it is UTF8 immediately. This yields a small speedup, as it prevents string operations on the encoding argument. PR-URL: #4010 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Trevor Norris <trev.norris@gmail.com>
diff --git a/lib/buffer.js b/lib/buffer.js
@@ -272,6 +272,7 @@ function byteLength(string, encoding) {
 
       case 'utf8':
       case 'utf-8':
+      case undefined:
         return binding.byteLengthUtf8(string);
 
       case 'ucs2':
