From c43118be4f8938a3c1d12f836d80c334cba76656 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Mon, 11 Dec 2017 17:39:08 +0800
Subject: remove unused code (#2579)

fixes #2577
---
 lib/utils.js | 16 ----------------
 1 file changed, 16 deletions(-)

diff --git a/lib/utils.js b/lib/utils.js
index 76306919..102c4789 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -43,10 +43,6 @@
 
 "use strict";
 
-function slice(a, start) {
-    return Array.prototype.slice.call(a, start || 0);
-};
-
 function characters(str) {
     return str.split("");
 };
@@ -214,18 +210,6 @@ function mergeSort(array, cmp) {
     return _ms(array);
 };
 
-function set_difference(a, b) {
-    return a.filter(function(el){
-        return b.indexOf(el) < 0;
-    });
-};
-
-function set_intersection(a, b) {
-    return a.filter(function(el){
-        return b.indexOf(el) >= 0;
-    });
-};
-
 // this function is taken from Acorn [1], written by Marijn Haverbeke
 // [1] https://github.com/marijnh/acorn
 function makePredicate(words) {
-- 
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