From 4bd61d39280c064917fe517200482649cfc179ff Mon Sep 17 00:00:00 2001
From: Chris Gray <chris.w.gray@gmail.com>
Date: Thu, 17 Mar 2016 07:17:12 -0500
Subject: [PATCH] Make head and tail calls more memory efficient

Used array_slice as opposed to using array_pop/array_shift to keep a copy of the source array from being created
---
 src/array.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/array.php b/src/array.php
index 83bcbca..2cd22ee 100644
--- a/src/array.php
+++ b/src/array.php
@@ -27,7 +27,7 @@ function grab(array $source, $keys)
  */
 function head(array $list)
 {
-    return array_shift($list);
+    return $list ? current(array_slice($list, 0, 1)) : null;
 }
 
 /**
@@ -39,5 +39,5 @@ function head(array $list)
  */
 function tail(array $list)
 {
-    return array_pop($list);
+    return $list ? current(array_slice($list, -1, 1)) : null;
 }