From 58e9ccaaa56cd36ec4ed2bb34a1143dbc2ff08cd Mon Sep 17 00:00:00 2001
From: Shelley Vohr <shelley.vohr@gmail.com>
Date: Tue, 6 Nov 2018 11:17:26 -0800
Subject: [PATCH] src: prefer param function check over args length

PR-URL: https://github.com/nodejs/node/pull/23835
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: John-David Dalton <john.david.dalton@gmail.com>
Reviewed-By: Yuta Hiroto <hello@hiroppy.me>
---
 lib/fs.js | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/fs.js b/lib/fs.js
index 56421924fd287a..8d2c1dca628a2b 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -408,7 +408,7 @@ function open(path, flags, mode, callback) {
   path = toPathIfFileURL(path);
   validatePath(path);
   const flagsNumber = stringToFlags(flags);
-  if (arguments.length < 4) {
+  if (typeof mode === 'function') {
     callback = makeCallback(mode);
     mode = 0o666;
   } else {
@@ -788,7 +788,7 @@ function readdirSync(path, options) {
 }
 
 function fstat(fd, options, callback) {
-  if (arguments.length < 3) {
+  if (typeof options === 'function') {
     callback = options;
     options = {};
   }
@@ -799,7 +799,7 @@ function fstat(fd, options, callback) {
 }
 
 function lstat(path, options, callback) {
-  if (arguments.length < 3) {
+  if (typeof options === 'function') {
     callback = options;
     options = {};
   }
@@ -812,7 +812,7 @@ function lstat(path, options, callback) {
 }
 
 function stat(path, options, callback) {
-  if (arguments.length < 3) {
+  if (typeof options === 'function') {
     callback = options;
     options = {};
   }