From ceb5b4c9a30f47bcec2380f972ce09cfea532f8b Mon Sep 17 00:00:00 2001
From: Amey Sakhadeo <me@ameyms.com>
Date: Wed, 28 Aug 2013 22:24:55 +0530
Subject: [PATCH] Ref #14313: Optimize 1.x jQuery.merge for size. (cherry
 picked from commits c75c9a8ebb5d2483daa68bec799e0d770083a811
 f66d53c85643e703a8e37d9ca9375dd386a60cda)

---
 src/core.js       | 18 +++++++------
 test/unit/core.js | 64 ++++++++++++++++++++++++++++++++++++++---------
 2 files changed, 62 insertions(+), 20 deletions(-)

diff --git a/src/core.js b/src/core.js
index d1e7a97e5..cc13f1ed3 100644
--- a/src/core.js
+++ b/src/core.js
@@ -629,15 +629,17 @@ jQuery.extend({
 	},
 
 	merge: function( first, second ) {
-		var l = second.length,
-			i = first.length,
-			j = 0;
+		var len = +second.length,
+			j = 0,
+			i = first.length;
 
-		if ( typeof l === "number" ) {
-			for ( ; j < l; j++ ) {
-				first[ i++ ] = second[ j ];
-			}
-		} else {
+		while ( j < len ) {
+			first[ i++ ] = second[ j++ ];
+		}
+
+		// Support: IE<9
+		// Workaround non-numeric length overrides of otherwise arraylike objects (e.g., NodeLists)
+		if ( len !== len ) {
 			while ( second[j] !== undefined ) {
 				first[ i++ ] = second[ j++ ];
 			}
diff --git a/test/unit/core.js b/test/unit/core.js
index 8817c95f9..e57d53334 100644
--- a/test/unit/core.js
+++ b/test/unit/core.js
@@ -905,25 +905,65 @@ test("jQuery.map", function() {
 });
 
 test("jQuery.merge()", function() {
-	expect(8);
+	expect( 10 );
 
-	deepEqual( jQuery.merge([],[]), [], "Empty arrays" );
+	deepEqual(
+		jQuery.merge( [], [] ),
+		[],
+		"Empty arrays"
+	);
 
-	deepEqual( jQuery.merge([ 1 ],[ 2 ]), [ 1, 2 ], "Basic" );
-	deepEqual( jQuery.merge([ 1, 2 ], [ 3, 4 ]), [ 1, 2, 3, 4 ], "Basic" );
+	deepEqual(
+		jQuery.merge( [ 1 ], [ 2 ] ),
+		[ 1, 2 ],
+		"Basic (single-element)"
+	);
+	deepEqual(
+		jQuery.merge( [ 1, 2 ], [ 3, 4 ] ),
+		[ 1, 2, 3, 4 ],
+		"Basic (multiple-element)"
+	);
 
-	deepEqual( jQuery.merge([ 1, 2 ],[]), [ 1, 2 ], "Second empty" );
-	deepEqual( jQuery.merge([],[ 1, 2 ]), [ 1, 2 ], "First empty" );
+	deepEqual(
+		jQuery.merge( [ 1, 2 ], [] ),
+		[ 1, 2 ],
+		"Second empty"
+	);
+	deepEqual(
+		jQuery.merge( [], [ 1, 2 ] ),
+		[ 1, 2 ],
+		"First empty"
+	);
 
 	// Fixed at [5998], #3641
-	deepEqual( jQuery.merge([ -2, -1 ], [ 0, 1, 2 ]), [ -2, -1 , 0, 1, 2 ],
-		"Second array including a zero (falsy)");
+	deepEqual(
+		jQuery.merge( [ -2, -1 ], [ 0, 1, 2 ] ),
+		[ -2, -1 , 0, 1, 2 ],
+		"Second array including a zero (falsy)"
+	);
 
 	// After fixing #5527
-	deepEqual( jQuery.merge([], [ null, undefined ]), [ null, undefined ],
-		"Second array including null and undefined values");
-	deepEqual( jQuery.merge({ length: 0 }, [ 1, 2 ] ), { length: 2, 0: 1, 1: 2},
-		"First array like");
+	deepEqual(
+		jQuery.merge( [], [ null, undefined ] ),
+		[ null, undefined ],
+		"Second array including null and undefined values"
+	);
+	deepEqual(
+		jQuery.merge( { length: 0 }, [ 1, 2 ] ),
+		{ length: 2, 0: 1, 1: 2 },
+		"First array like"
+	);
+	deepEqual(
+		jQuery.merge( [ 1, 2 ], { length: 1, 0: 3 } ),
+		[ 1, 2, 3 ],
+		"Second array like"
+	);
+
+	deepEqual(
+		jQuery.merge( [], document.getElementById("lengthtest").getElementsByTagName("input") ),
+		[ document.getElementById("length"), document.getElementById("idTest") ],
+		"Second NodeList"
+	);
 });
 
 test("jQuery.extend(Object, Object)", function() {
-- 
2.39.5