Make _.where iterate over only own properties.

Former-commit-id: 29b4cafe5271cad70c711c2d401cea627fa97e33

build.js

@@ -156,7 +156,7 @@
     'uniqueId': [],
     'value': ['mixin'],
     'values': ['forOwn'],
-    'where': ['filter', 'forIn'],
+    'where': ['filter', 'keys'],
     'without': ['indexOf'],
     'wrap': [],
     'zip': ['max', 'pluck']
@@ -988,13 +988,14 @@
         dependencyMap.reduceRight = ['forEach', 'keys'];
       }
       if (isUnderscore) {
-        dependencyMap.contains = ['forEach', 'indexOf'],
+        dependencyMap.contains = ['forEach', 'indexOf'];
         dependencyMap.isEqual = ['isArray', 'isFunction'];
         dependencyMap.isEmpty = ['isArray', 'isString'];
         dependencyMap.max = ['forEach', 'isArray'];
         dependencyMap.min = ['forEach', 'isArray'];
         dependencyMap.pick = [];
         dependencyMap.template = ['defaults', 'escape'];
+        dependencyMap.where = ['filter', 'forIn'];
 
         if (useUnderscoreClone) {
           dependencyMap.clone = ['assign', 'isArray'];
@@ -1255,6 +1256,26 @@
           '  }'
         ].join('\n'));
 
+        // replace `_.where`
+        source = source.replace(/^( *)function where[\s\S]+?\n\1}/m, [
+          '  function where(collection, properties) {',
+          '    var props = [];',
+          '    forIn(properties, function(value, prop) {',
+          '      props.push(prop);',
+          '    });',
+          '    return filter(collection, function(object) {',
+          '      var length = props.length;',
+          '      while (length--) {',
+          '        var result = object[props[length]] === properties[props[length]];',
+          '        if (!result) {',
+          '          break;',
+          '        }',
+          '      }',
+          '      return !!result;',
+          '    });',
+          '  }'
+        ].join('\n'));
+
         // replace `_.without`
         source = source.replace(/^( *)function without[\s\S]+?\n\1}/m, [
           '  function without(array) {',

lodash.js

@@ -2537,10 +2537,7 @@
    * // => [{ 'name': 'moe', 'age': 40 }]
    */
   function where(collection, properties) {
-    var props = [];
-    forIn(properties, function(value, prop) {
-      props.push(prop);
-    });
+    var props = keys(properties);
     return filter(collection, function(object) {
       var length = props.length;
       while (length--) {

test/test-build.js

@@ -636,7 +636,7 @@
 
       build(['-s', 'underscore'], function(source, filePath) {
         var last,
-            array = [{ 'value': 1 }, { 'value': 2 }],
+            array = [{ 'a': 1, 'b': 2 }, { 'a': 2, 'b': 2 }],
             basename = path.basename(filePath, '.js'),
             context = createContext();
 
@@ -658,17 +658,17 @@
         deepEqual(lodash.extend({}, new Foo), Foo.prototype, '_.extend should assign inherited `source` properties: ' + basename);
 
         actual = lodash.find(array, function(value) {
-          return 'value' in value;
+          return 'a' in value;
         });
 
-        equal(actual, array[0], '_.find: ' + basename);
+        equal(actual, _.first(array), '_.find: ' + basename);
 
         actual = lodash.forEach(array, function(value) {
           last = value;
           return false;
         });
 
-        equal(last.value, 2, '_.forEach should not exit early: ' + basename);
+        equal(last, _.last(array), '_.forEach should not exit early: ' + basename);
         equal(actual, undefined, '_.forEach should return `undefined`: ' + basename);
 
         object = { 'length': 0, 'splice': Array.prototype.splice };
@@ -688,6 +688,11 @@
 
         equal(lodash.some([false, true, false]), true, '_.some: ' + basename);
         equal(lodash.template('${a}', object), '${a}', '_.template should ignore ES6 delimiters: ' + basename);
+
+        var properties = new Foo;
+        properties.b = 2;
+        deepEqual(lodash.where(array, properties), [_.first(array)], '_.where should filter by inherited properties: ' + basename);
+
         start();
       });
     });

test/test.js

@@ -1855,14 +1855,13 @@
       deepEqual(_.where(array, { 'a': 1, 'b': 2 }), [{ 'a': 1, 'b': 2 }]);
     });
 
-    test('should filter by inherited properties', function() {
+    test('should not filter by inherited properties', function() {
       function Foo() {}
-      Foo.prototype = { 'b': 2 };
+      Foo.prototype = { 'a': 2 };
 
       var properties = new Foo;
-      properties.a = 1;
-
-      deepEqual(_.where(array, properties), [{ 'a': 1, 'b': 2 }]);
+      properties.b = 2;
+      deepEqual(_.where(array, properties), [{ 'a': 1, 'b': 2 }, { 'a': 2, 'b': 2 }]);
     });
 
     test('should filter by problem JScript properties (test in IE < 9)', function() {