From 45f07d501476a5a80612f98ac34544f12eedd922 Mon Sep 17 00:00:00 2001
From: John-David Dalton <john.david.dalton@gmail.com>
Date: Sat, 14 Nov 2015 20:50:18 -0800
Subject: [PATCH] Ensure shortcut fusion works for `_.at` with no indexes
 specified.

---
 lodash.js    |  7 +++++--
 test/test.js | 12 ++++++------
 2 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/lodash.js b/lodash.js
index 8733fbce7..56b2b6dc3 100644
--- a/lodash.js
+++ b/lodash.js
@@ -13895,8 +13895,11 @@
 
     LazyWrapper.prototype.at = rest(function(paths) {
       paths = baseFlatten(paths);
-      return (paths.length == 1 && isIndex(paths[0]))
-        ? this.slice(paths[0], +paths[0] + 1)
+      var length = paths.length,
+          start = length ? paths[0] : 0;
+
+      return (length < 2 && isIndex(start))
+        ? this.slice(start, length ? (+start + 1) : start)
         : new LazyWrapper(this);
     });
 
diff --git a/test/test.js b/test/test.js
index c044b6d40..bf80a455b 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1269,7 +1269,7 @@
     });
 
     QUnit.test('should support shortcut fusion', function(assert) {
-      assert.expect(4);
+      assert.expect(6);
 
       if (!isNpm) {
         var array = lodashStable.range(LARGE_ARRAY_SIZE),
@@ -1277,16 +1277,16 @@
             iteratee = function(value) { count++; return square(value); },
             lastIndex = LARGE_ARRAY_SIZE - 1;
 
-        _.each([lastIndex, lastIndex + ''], function(index) {
+        _.each([lastIndex, lastIndex + '', []], function(n, index) {
           count = 0;
-          var actual = _(array).map(iteratee).at(index).value();
+          var actual = _(array).map(iteratee).at(n).value();
 
-          assert.strictEqual(count, 1);
-          assert.deepEqual(actual, [square(lastIndex)]);
+          assert.strictEqual(count, index == 2 ? 0 : 1);
+          assert.deepEqual(actual, index == 2 ? [] : [square(lastIndex)]);
         });
       }
       else {
-        skipTest(assert, 4);
+        skipTest(assert, 6);
       }
     });