From d0ae61379f147f75057c60670a25bf3b5389c6d4 Mon Sep 17 00:00:00 2001
From: alexlamsl <alexlamsl@gmail.com>
Date: Wed, 21 Mar 2018 18:59:29 +0800
Subject: [PATCH] speed up `has_parens()`

---
 lib/output.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/output.js b/lib/output.js
index 6c1d61a3..f60b474c 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -576,7 +576,7 @@ function OutputStream(options) {
         indentation     : function() { return indentation },
         current_width   : function() { return current_col - indentation },
         should_break    : function() { return options.width && this.current_width() >= options.width },
-        has_parens      : function() { return OUTPUT.slice(-1) == "(" },
+        has_parens      : function() { return OUTPUT[OUTPUT.length - 1] == "(" },
         newline         : newline,
         print           : print,
         space           : space,