fix(Angular.js): fix isArrayLike for unusual cases

Closes angular#10186
Closes angular#8000
Closes angular#4855
Closes angular#4751
Closes angular#10272

src/Angular.js

@@ -191,27 +191,32 @@ var
 msie = document.documentMode;
 
 
+function isNodeList(obj) {
+  return typeof obj.length == 'number' &&
+         typeof obj.item == 'function' &&
+         typeof obj.nodeType == 'number';
+}
+
 /**
  * @private
  * @param {*} obj
  * @return {boolean} Returns true if `obj` is an array or array-like object (NodeList, Arguments,
  *                   String ...)
  */
 function isArrayLike(obj) {
-  if (obj == null || isWindow(obj)) {
-    return false;
-  }
+
+  // `null`, `undefined` and `window` are not array-like
+  if (obj == null || isWindow(obj)) return false;
+
+  // arrays and strings are array like
+  if (isArray(obj) || isString(obj)) return true;
 
   // Support: iOS 8.2 (not reproducible in simulator)
   // "length" in obj used to prevent JIT error (gh-11508)
   var length = "length" in Object(obj) && obj.length;
 
-  if (obj.nodeType === NODE_TYPE_ELEMENT && length) {
-    return true;
-  }
-
-  return isString(obj) || isArray(obj) || length === 0 ||
-         typeof length === 'number' && length > 0 && (length - 1) in obj;
+  // node lists and objects with suitable length characteristics are array-like
+  return (isNumber(length) && length >= 0 && (length - 1) in obj) || isNodeList(obj);
 }
 
 /**
@@ -471,7 +476,7 @@ identity.$inject = [];
 function valueFn(value) {return function() {return value;};}
 
 function hasCustomToString(obj) {
-  return isFunction(obj.toString) && obj.toString !== Object.prototype.toString;
+  return isFunction(obj.toString) && obj.toString !== toString;
 }
 
 

test/AngularSpec.js

@@ -474,6 +474,7 @@ describe('angular', function() {
   });
 
   describe("extend", function() {
+
     it('should not copy the private $$hashKey', function() {
       var src,dst;
       src = {};
@@ -484,6 +485,24 @@ describe('angular', function() {
     });
 
 
+    it('should copy the properties of the source object onto the destination object', function() {
+      var destination, source;
+      destination = {};
+			source = {foo: true};
+      destination = extend(destination, source);
+      expect(isDefined(destination.foo)).toBe(true);
+    });
+
+
+    it('ISSUE #4751 - should copy the length property of an object source to the destination object', function() {
+      var destination, source;
+      destination = {};
+      source = {radius: 30, length: 0};
+      destination = extend(destination, source);
+      expect(isDefined(destination.length)).toBe(true);
+      expect(isDefined(destination.radius)).toBe(true);
+    });
+
     it('should retain the previous $$hashKey', function() {
       var src,dst,h;
       src = {};
@@ -1048,6 +1067,42 @@ describe('angular', function() {
     });
   });
 
+  describe('isArrayLike', function() {
+
+    it('should return false if passed a number', function() {
+      expect(isArrayLike(10)).toBe(false);
+    });
+
+    it('should return true if passed an array', function() {
+      expect(isArrayLike([1,2,3,4])).toBe(true);
+    });
+
+    it('should return true if passed an object', function() {
+      expect(isArrayLike({0:"test", 1:"bob", 2:"tree", length:3})).toBe(true);
+    });
+
+    it('should return true if passed arguments object', function() {
+      function test(a,b,c) {
+        expect(isArrayLike(arguments)).toBe(true);
+      }
+      test(1,2,3);
+    });
+
+    it('should return true if passed a nodelist', function() {
+      var nodes = document.body.childNodes;
+      expect(isArrayLike(nodes)).toBe(true);
+    });
+
+    it('should return false for objects with `length` but no matching indexable items', function() {
+      var obj = {
+        a: 'a',
+        b:'b',
+        length: 10
+      };
+      expect(isArrayLike(obj)).toBe(false);
+    });
+  });
+
 
   describe('forEach', function() {
     it('should iterate over *own* object properties', function() {

test/ng/directive/ngRepeatSpec.js

@@ -612,6 +612,15 @@ describe('ngRepeat', function() {
     expect(element.text()).toEqual('misko:m:0|shyam:s:1|frodo:f:2|');
   });
 
+  it('should expose iterator offset as $index when iterating over objects with length key value 0', function() {
+    element = $compile(
+      '<ul>' +
+        '<li ng-repeat="(key, val) in items">{{key}}:{{val}}:{{$index}}|</li>' +
+      '</ul>')(scope);
+    scope.items = {'misko':'m', 'shyam':'s', 'frodo':'f', 'length':0};
+    scope.$digest();
+    expect(element.text()).toEqual('misko:m:0|shyam:s:1|frodo:f:2|length:0:3|');
+  });
 
   it('should expose iterator position as $first, $middle and $last when iterating over arrays',
       function() {