Add array and object pools to lodash.

Former-commit-id: f038284d6a544e146dc271ed0fbea0d7401593d4

build.js

@@ -85,7 +85,7 @@
     'bind': ['createBound'],
     'bindAll': ['bind', 'functions'],
     'bindKey': ['createBound'],
-    'clone': ['assign', 'forEach', 'forOwn', 'isArray', 'isObject', 'isNode', 'slice'],
+    'clone': ['assign', 'forEach', 'forOwn', 'getArray', 'isArray', 'isObject', 'isNode', 'releaseArray', 'slice'],
     'cloneDeep': ['clone'],
     'compact': [],
     'compose': [],
@@ -114,7 +114,7 @@
     'identity': [],
     'indexOf': ['basicIndexOf', 'sortedIndex'],
     'initial': ['slice'],
-    'intersection': ['createCache'],
+    'intersection': ['createCache', 'getArray', 'releaseArray'],
     'invert': ['keys'],
     'invoke': ['forEach'],
     'isArguments': [],
@@ -123,7 +123,7 @@
     'isDate': [],
     'isElement': [],
     'isEmpty': ['forOwn', 'isArguments', 'isFunction'],
-    'isEqual': ['forIn', 'isArguments', 'isFunction', 'isNode'],
+    'isEqual': ['forIn', 'getArray', 'isArguments', 'isFunction', 'isNode', 'releaseArray'],
     'isFinite': [],
     'isFunction': [],
     'isNaN': ['isNumber'],
@@ -140,7 +140,7 @@
     'map': ['basicEach', 'createCallback', 'isArray'],
     'max': ['basicEach', 'charAtCallback', 'createCallback', 'isArray', 'isString'],
     'memoize': [],
-    'merge': ['forEach', 'forOwn', 'isArray', 'isObject', 'isPlainObject'],
+    'merge': ['forEach', 'forOwn', 'getArray', 'isArray', 'isObject', 'isPlainObject', 'releaseArray'],
     'min': ['basicEach', 'charAtCallback', 'createCallback', 'isArray', 'isString'],
     'mixin': ['forEach', 'functions'],
     'noConflict': [],
@@ -163,7 +163,7 @@
     'shuffle': ['forEach'],
     'size': ['keys'],
     'some': ['basicEach', 'createCallback', 'isArray'],
-    'sortBy': ['compareAscending', 'createCallback', 'forEach'],
+    'sortBy': ['compareAscending', 'createCallback', 'forEach', 'getObject', 'releaseObject'],
     'sortedIndex': ['createCallback', 'identity'],
     'tap': ['value'],
     'template': ['defaults', 'escape', 'escapeStringChar', 'keys', 'values'],
@@ -173,7 +173,7 @@
     'transform': ['createCallback', 'createObject', 'forOwn', 'isArray'],
     'unescape': ['unescapeHtmlChar'],
     'union': ['isArray', 'uniq'],
-    'uniq': ['createCache', 'getIndexOf', 'overloadWrapper'],
+    'uniq': ['createCache', 'getArray', 'getIndexOf', 'overloadWrapper', 'releaseArray'],
     'uniqueId': [],
     'unzip': ['max', 'pluck'],
     'value': ['basicEach', 'forOwn', 'isArray', 'lodashWrapper'],
@@ -190,17 +190,21 @@
     'charAtCallback': [],
     'compareAscending': [],
     'createBound': ['createObject', 'isFunction', 'isObject'],
-    'createCache': ['basicIndexOf', 'getIndexOf'],
+    'createCache': ['basicIndexOf', 'getArray', 'getIndexOf', 'getObject', 'releaseObject'],
-    'createIterator': ['iteratorTemplate'],
+    'createIterator': ['getObject', 'iteratorTemplate', 'releaseObject'],
     'createObject': [ 'isObject', 'noop'],
     'escapeHtmlChar': [],
     'escapeStringChar': [],
+    'getArray': [],
     'getIndexOf': ['basicIndexOf', 'indexOf'],
+    'getObject': [],
     'iteratorTemplate': [],
     'isNode': [],
     'lodashWrapper': [],
     'noop': [],
     'overloadWrapper': ['createCallback'],
+    'releaseArray': [],
+    'releaseObject': [],
     'shimIsPlainObject': ['forIn', 'isArguments', 'isFunction', 'isNode'],
     'shimKeys': ['createIterator', 'isArguments'],
     'slice': [],
@@ -222,9 +226,7 @@
     'shadowedProps',
     'top',
     'useHas',
-    'useKeys',
+    'useKeys'
-    'shimIsPlainObject',
-    'shimKyes'
   ];
 
   /** List of all methods */
@@ -309,9 +311,6 @@
     'unzip'
   ];
 
-  /** List of Underscore methods */
-  var underscoreMethods = _.without.apply(_, [allMethods].concat(lodashOnlyMethods));
-
   /** List of ways to export the `lodash` function */
   var exportsAll = [
     'amd',
@@ -341,15 +340,22 @@
     'createIterator',
     'escapeHtmlChar',
     'escapeStringChar',
+    'getArray',
+    'getObject',
     'isNode',
     'iteratorTemplate',
     'lodashWrapper',
     'overloadWrapper',
+    'releaseArray',
+    'releaseObject',
     'shimIsPlainObject',
     'shimKeys',
     'slice',
     'unescapeHtmlChar'
-  ]
+  ];
+
+  /** List of Underscore methods */
+  var underscoreMethods = _.without.apply(_, [allMethods].concat(lodashOnlyMethods, privateMethods));
 
   /*--------------------------------------------------------------------------*/
 
@@ -990,7 +996,7 @@
       // match a function declaration
       'function ' + funcName + '\\b[\\s\\S]+?\\n\\1}|' +
       // match a variable declaration with function expression
-      'var ' + funcName + ' *=.*?function[\\s\\S]+?\\n\\1};' +
+      'var ' + funcName + ' *=.*?function[\\s\\S]+?\\n\\1}(?:\\(\\)\\))?;' +
       // end non-capturing group
       ')\\n'
     )));
@@ -1051,24 +1057,30 @@
       return source;
     }
     // remove data object property assignment
-    var modified = snippet
+    var modified = snippet.replace(RegExp("^(?: *\\/\\/.*\\n)* *data\\." + identifier + " *= *(.+\\n+)", 'm'), function(match, postlude) {
-      .replace(RegExp("^(?: *\\/\\/.*\\n)* *'" + identifier + "':.+\\n+", 'm'), '')
+      return /\bdata\b/.test(postlude) ? postlude : '';
-      .replace(/,(?=\s*})/, '');
+    });
 
     source = source.replace(snippet, function() {
       return modified;
     });
 
-    // clip at the `factory` assignment
+    // clip to the `factory` assignment
     snippet = modified.match(/Function\([\s\S]+$/)[0];
 
-    modified = snippet
+    // remove `factory` arguments
-      .replace(RegExp('\\b' + identifier + '\\b,? *', 'g'), '')
+    source = source.replace(snippet, function(match) {
-      .replace(/, *(?=',)/, '')
+      return match
-      .replace(/,(?=\s*\))/, '')
+        .replace(RegExp('\\b' + identifier + '\\b,? *', 'g'), '')
+        .replace(/, *(?=',)/, '')
+        .replace(/,(?=\s*\))/, '');
+    });
 
-    source = source.replace(snippet, function() {
+    // remove property assignment from `getObject`
-      return modified;
+    source = source.replace(matchFunction(source, 'getObject'), function(match) {
+      return match
+        .replace(RegExp("^(?: *\\/\\/.*\\n)* *'" + identifier + "':.+\\n+", 'm'), '')
+        .replace(/,(?=\s*})/, '');
     });
 
     return source;
@@ -1952,6 +1964,15 @@
           dependencyMap.where.push('find', 'isEmpty');
         }
 
+        _.each(['clone', 'difference', 'intersection', 'isEqual', 'sortBy', 'uniq'], function(methodName) {
+          if (methodName == 'clone'
+                ? (!useLodashMethod('clone') && !useLodashMethod('cloneDeep'))
+                : !useLodashMethod(methodName)
+              ) {
+            dependencyMap[methodName] = _.without(dependencyMap[methodName], 'getArray', 'getObject', 'releaseArray', 'releaseObject');
+          }
+        });
+
         _.each(['debounce', 'throttle'], function(methodName) {
           if (!useLodashMethod(methodName)) {
             dependencyMap[methodName] = [];
@@ -1964,6 +1985,12 @@
           }
         });
 
+        _.each(['flatten', 'uniq'], function(methodName) {
+          if (!useLodashMethod(methodName)) {
+            dependencyMap[methodName] = _.without(dependencyMap[methodName], 'overloadWrapper');
+          }
+        });
+
         _.each(['max', 'min'], function(methodName) {
           if (!useLodashMethod(methodName)) {
             dependencyMap[methodName] = _.without(dependencyMap[methodName], 'charAtCallback', 'isArray', 'isString');
@@ -1973,6 +2000,12 @@
       if (isModern || isUnderscore) {
         dependencyMap.reduceRight = _.without(dependencyMap.reduceRight, 'isString');
 
+        _.each(['assign', 'basicEach', 'defaults', 'forIn', 'forOwn', 'shimKeys'], function(methodName) {
+          if (!(isUnderscore && useLodashMethod(methodName))) {
+            dependencyMap[methodName] = _.without(dependencyMap[methodName], 'createIterator');
+          }
+        });
+
         _.each(['at', 'forEach', 'toArray'], function(methodName) {
           if (!(isUnderscore && useLodashMethod(methodName))) {
             dependencyMap[methodName] = _.without(dependencyMap[methodName], 'isString');
@@ -2644,6 +2677,32 @@
             '}'
           ].join('\n'));
         }
+        // replace `_.sortBy`
+        if (!useLodashMethod('sortBy')) {
+          source = replaceFunction(source, 'sortBy', [
+            'function sortBy(collection, callback, thisArg) {',
+            '  var index = -1,',
+            '      length = collection ? collection.length : 0,',
+            "      result = Array(typeof length == 'number' ? length : 0);",
+            '',
+            '  callback = lodash.createCallback(callback, thisArg);',
+            '  forEach(collection, function(value, key, collection) {',
+            '    result[++index] = {',
+            "      'criteria': callback(value, key, collection),",
+            "      'index': index,",
+            "      'value': value",
+            '    };',
+            '  });',
+            '',
+            '  length = result.length;',
+            '  result.sort(compareAscending);',
+            '  while (length--) {',
+            '    result[length] = result[length].value;',
+            '  }',
+            '  return result;',
+            '}'
+          ].join('\n'));
+        }
         // replace `_.template`
         if (!useLodashMethod('template')) {
           // remove `_.templateSettings.imports assignment
@@ -2846,7 +2905,10 @@
 
         // replace `slice` with `nativeSlice.call`
         _.each(['clone', 'first', 'initial', 'last', 'rest', 'toArray'], function(methodName) {
-          if (!useLodashMethod(methodName)) {
+          if (methodName == 'clone'
+                ? (!useLodashMethod('clone') && !useLodashMethod('cloneDeep'))
+                : !useLodashMethod(methodName)
+              ) {
             source = source.replace(matchFunction(source, methodName), function(match) {
               return match.replace(/([^.])\bslice\(/g, '$1nativeSlice.call(');
             });
@@ -3163,6 +3225,12 @@
         source = removeVar(source, 'htmlEscapes');
         source = removeVar(source, 'htmlUnescapes');
       }
+      if (isRemoved(source, 'getArray', 'releaseArray')) {
+        source = removeVar(source, 'arrayPool');
+      }
+      if (isRemoved(source, 'getObject', 'releaseObject')) {
+        source = removeVar(source, 'objectPool');
+      }
       if (isRemoved(source, 'invert')) {
         source = replaceVar(source, 'htmlUnescapes', "{'&amp;':'&','&lt;':'<','&gt;':'>','&quot;':'\"','&#x27;':\"'\"}");
       }

build/pre-compile.js

@@ -312,11 +312,32 @@
     // remove debug sourceURL use in `_.template`
     source = source.replace(/(?:\s*\/\/.*\n)* *var sourceURL[^;]+;|\+ *sourceURL/g, '');
 
-    // minify internal properties used by 'compareAscending' and `_.sortBy`
+    // minify internal properties
     (function() {
-      var properties = ['criteria', 'index', 'value'],
+      var methods = [
-          snippets = source.match(/( +)function (?:compareAscending|sortBy)\b[\s\S]+?\n\1}/g);
+        'compareAscending',
+        'createCache',
+        'difference',
+        'getObject',
+        'intersection',
+        'releaseObject',
+        'sortBy',
+        'uniq'
+      ];
 
+      var props = [
+        'array',
+        'cache',
+        'contains',
+        'criteria',
+        'index',
+        'indexOf',
+        'initArray',
+        'release',
+        'value'
+      ];
+
+      var snippets = source.match(RegExp('^( +)(?:var|function) +(?:' + methods.join('|') + ')\\b[\\s\\S]+?\\n\\1}', 'gm'));
       if (!snippets) {
         return;
       }
@@ -324,11 +345,12 @@
         var modified = snippet;
 
         // minify properties
-        properties.forEach(function(property, index) {
+        props.forEach(function(prop, index) {
-          var minName = minNames[index],
+          // use minified names different than those chosen for `iteratorOptions`
-              reBracketProp = RegExp("\\['(" + property + ")'\\]", 'g'),
+          var minName = minNames[iteratorOptions.length + index],
-              reDotProp = RegExp('\\.' + property + '\\b', 'g'),
+              reBracketProp = RegExp("\\['(" + prop + ")'\\]", 'g'),
-              rePropColon = RegExp("([^?\\s])\\s*([\"'])?\\b" + property + "\\2 *:", 'g');
+              reDotProp = RegExp('\\.' + prop + '\\b', 'g'),
+              rePropColon = RegExp("([^?\\s])\\s*([\"'])?\\b" + prop + "\\2 *:", 'g');
 
           modified = modified
             .replace(reBracketProp, "['" + minName + "']")
@@ -352,8 +374,8 @@
         'createIterator\\((?:{|[a-zA-Z]+)[\\s\\S]*?\\);\\n',
         // match variables storing `createIterator` options
         '( +)var [a-zA-Z]+IteratorOptions\\b[\\s\\S]+?\\n\\2}',
-        // match the the `createIterator` function
+        // match the `createIterator`, `getObject`, and `releaseObject` functions
-        '( +)function createIterator\\b[\\s\\S]+?\\n\\3}'
+        '( +)function (?:createIterator|getObject|releaseObject)\\b[\\s\\S]+?\\n\\3}'
       ].join('|'), 'g')
     );
 
@@ -363,7 +385,7 @@
     }
 
     snippets.forEach(function(snippet, index) {
-      var isCreateIterator = /function createIterator\b/.test(snippet),
+      var isFunc = /^ *function +/m.test(snippet),
           isIteratorTemplate = /var iteratorTemplate\b/.test(snippet),
           modified = snippet;
 
@@ -392,8 +414,8 @@
         var minName = minNames[index];
 
         // minify variable names present in strings
-        if (isCreateIterator) {
+        if (isFunc) {
-          modified = modified.replace(RegExp('(([\'"])[^\\n\\2]*?)\\b' + varName + '\\b(?=[^\\n\\2]*\\2[ ,+]+$)', 'gm'), '$1' + minName);
+          modified = modified.replace(RegExp('(([\'"])[^\\n\\2]*?)\\b' + varName + '\\b(?=[^\\n\\2]*\\2[ ,+;]+$)', 'gm'), '$1' + minName);
         }
         // ensure properties in compiled strings aren't minified
         else {

lodash.js

@@ -23,6 +23,10 @@
     window = freeGlobal;
   }
 
+  /** Used to pool arrays and objects used internally */
+  var arrayPool = [],
+      objectPool = [];
+
   /** Used to generate unique IDs */
   var idCounter = 0;
 
@@ -139,6 +143,74 @@
     '\u2029': 'u2029'
   };
 
+  /**
+   * Gets an array from the array pool or creates a new one if the pool is empty.
+   *
+   * @private
+   * @returns {Array} The array from the pool.
+   */
+  function getArray() {
+    return arrayPool.pop() || [];
+  }
+
+  /**
+   * Gets an object from the object pool or creates a new one if the pool is empty.
+   *
+   * @private
+   * @returns {Object} The object from the pool.
+   */
+  function getObject() {
+    return objectPool.pop() || {
+      'args': null,
+      'array': null,
+      'arrays': null,
+      'contains': null,
+      'criteria': null,
+      'false': null,
+      'firstArg': null,
+      'function': null,
+      'index': null,
+      'indexOf': null,
+      'init': null,
+      'initArray': null,
+      'null': null,
+      'number': null,
+      'object': null,
+      'push': null,
+      'release': null,
+      'shadowedProps': null,
+      'string': null,
+      'support': null,
+      'true': null,
+      'undefined': null,
+      'useHas': null,
+      'useKeys': null,
+      'value': null
+    };
+  }
+
+  /**
+   * Releases the given `array` back to the array pool.
+   *
+   * @private
+   * @param {Array} [array] The array to release.
+   */
+  function releaseArray(array) {
+    array.length = 0;
+    arrayPool.push(array);
+  }
+
+  /**
+   * Releases the given `object` back to the object pool.
+   *
+   * @private
+   * @param {Object} [object] The object to release.
+   */
+  function releaseObject(object) {
+    object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null;
+    objectPool.push(object);
+  }
+
   /*--------------------------------------------------------------------------*/
 
   /**
@@ -580,8 +652,8 @@
       // iterate own properties using `Object.keys`
       '  <% if (useHas && useKeys) { %>\n' +
       '  var ownIndex = -1,\n' +
-      '      ownProps = objectTypes[typeof iterable] ? keys(iterable) : [],\n' +
+      '      ownProps = objectTypes[typeof iterable] && keys(iterable),\n' +
-      '      length = ownProps.length;\n\n' +
+      '      length = ownProps ? ownProps.length : 0;\n\n' +
       '  while (++ownIndex < length) {\n' +
       '    index = ownProps[ownIndex];\n<%' +
       "    if (conditions.length) { %>    if (<%= conditions.join(' && ') %>) {\n  <% } %>" +
@@ -778,7 +850,6 @@
       return bound;
     }
 
-
     /**
      * Creates a function optimized to search large arrays for a given `value`,
      * starting at `fromIndex`, using strict equality for comparisons, i.e. `===`.
@@ -788,42 +859,28 @@
      * @param {Mixed} value The value to search for.
      * @returns {Boolean} Returns `true`, if `value` is found, else `false`.
      */
-    function createCache(array) {
+    var createCache = (function() {
-      array || (array = []);
-
-      var bailout,
-          index = -1,
-          indexOf = getIndexOf(),
-          length = array.length,
-          isLarge = length >= largeArraySize && lodash.indexOf != indexOf,
-          objCache = {};
-
-      var caches = {
-        'false': false,
-        'function': false,
-        'null': false,
-        'number': {},
-        'object': objCache,
-        'string': {},
-        'true': false,
-        'undefined': false
-      };
 
       function basicContains(value) {
-        return indexOf(array, value) > -1;
+        return this.indexOf(this.array, value) > -1;
       }
 
       function basicPush(value) {
-        array.push(value);
+        this.array.push(value);
       }
 
       function cacheContains(value) {
-        var type = typeof value;
+        var cache = this.cache,
+            type = typeof value;
+
         if (type == 'boolean' || value == null) {
-          return caches[value];
+          return cache[value];
         }
-        var cache = caches[type] || (type = 'object', objCache),
+        if (type != 'number' && type != 'string') {
-            key = type == 'number' ? value : keyPrefix + value;
+          type = 'object';
+        }
+        var key = type == 'number' ? value : keyPrefix + value;
+        cache = cache[type] || (cache[type] = {});
 
         return type == 'object'
           ? (cache[key] ? basicIndexOf(cache[key], value) > -1 : false)
@@ -831,12 +888,17 @@
       }
 
       function cachePush(value) {
-        var type = typeof value;
+        var cache = this.cache,
+            type = typeof value;
+
         if (type == 'boolean' || value == null) {
-          caches[value] = true;
+          cache[value] = true;
         } else {
-          var cache = caches[type] || (type = 'object', objCache),
+          if (type != 'number' && type != 'string') {
-              key = type == 'number' ? value : keyPrefix + value;
+            type = 'object';
+          }
+          var key = type == 'number' ? value : keyPrefix + value;
+          cache = cache[type] || (cache[type] = {});
 
           if (type == 'object') {
             bailout = (cache[key] || (cache[key] = [])).push(value) == length;
@@ -846,18 +908,49 @@
         }
       }
 
-      if (isLarge) {
+      function release() {
-        while (++index < length) {
+        var cache = this.cache;
-          cachePush(array[index]);
+        if (cache.initArray) {
-        }
+          releaseArray(this.array);
-        if (bailout) {
-          isLarge = caches = objCache = null;
         }
+        releaseObject(cache);
       }
-      return isLarge
+
-        ? { 'contains': cacheContains, 'push': cachePush }
+      return function(array) {
-        : { 'contains': basicContains, 'push': basicPush };
+        var bailout,
-    }
+            index = -1,
+            initArray = !array && (array = getArray()),
+            length = array.length,
+            isLarge = length >= largeArraySize && lodash.indexOf != indexOf;
+
+        var cache = getObject();
+        cache.initArray = initArray;
+        cache['false'] = cache['function'] = cache['null'] = cache['true'] = cache['undefined'] = false;
+
+        var result = getObject();
+        result.array = array;
+        result.indexOf = getIndexOf();
+        result.cache = cache;
+        result.contains = cacheContains;
+        result.push = cachePush;
+        result.release = release;
+
+        if (isLarge) {
+          while (++index < length) {
+            result.push(array[index]);
+          }
+          if (bailout) {
+            isLarge = false;
+            result.release();
+          }
+        }
+        if (!isLarge) {
+          result.contains = basicContains;
+          result.push = basicPush;
+        }
+        return result;
+      };
+    }());
 
     /**
      * Creates compiled iteration functions.
@@ -874,20 +967,17 @@
      * @returns {Function} Returns the compiled function.
      */
     function createIterator() {
-      var data = {
+      var data = getObject();
-        // data properties
-        'shadowedProps': shadowedProps,
-        'support': support,
 
-        // iterator options
+      // data properties
-        'arrays': '',
+      data.shadowedProps = shadowedProps;
-        'bottom': '',
+      data.support = support;
-        'init': 'iterable',
+
-        'loop': '',
+      // iterator options
-        'top': '',
+      data.arrays = data.bottom = data.loop = data.top = '';
-        'useHas': true,
+      data.init = 'iterable';
-        'useKeys': !!keys
+      data.useHas = true;
-      };
+      data.useKeys = !!keys;
 
       // merge options into a template data object
       for (var object, index = 0; object = arguments[index]; index++) {
@@ -900,16 +990,19 @@
 
       // create the function factory
       var factory = Function(
-          'errorClass, errorProto, hasOwnProperty, isArguments, isArray, isString, ' +
+          'errorClass, errorProto, hasOwnProperty, isArguments, isArray, ' +
-          'keys, lodash, objectProto, objectTypes, nonEnumProps, stringClass, ' +
+          'isString, keys, lodash, objectProto, objectTypes, nonEnumProps, ' +
-          'stringProto, toString',
+          'stringClass, stringProto, toString',
         'return function(' + args + ') {\n' + iteratorTemplate(data) + '\n}'
       );
+
+      releaseObject(data);
+
       // return the compiled function
       return factory(
-        errorClass, errorProto, hasOwnProperty, isArguments, isArray, isString,
+        errorClass, errorProto, hasOwnProperty, isArguments, isArray,
-        keys, lodash, objectProto, objectTypes, nonEnumProps, stringClass,
+        isString, keys, lodash, objectProto, objectTypes, nonEnumProps,
-        stringProto, toString
+        stringClass, stringProto, toString
       );
     }
 
@@ -1368,8 +1461,9 @@
           return ctor(result.source, reFlags.exec(result));
       }
       // check for circular references and return corresponding clone
-      stackA || (stackA = []);
+      var initStack = !stackA;
-      stackB || (stackB = []);
+      stackA || (stackA = getArray());
+      stackB || (stackB = getArray());
 
       var length = stackA.length;
       while (length--) {
@@ -1399,6 +1493,10 @@
         result[key] = clone(objValue, deep, callback, undefined, stackA, stackB);
       });
 
+      if (initStack) {
+        releaseArray(stackA);
+        releaseArray(stackB);
+      }
       return result;
     }
 
@@ -1845,8 +1943,9 @@
       // assume cyclic structures are equal
       // the algorithm for detecting cyclic structures is adapted from ES 5.1
       // section 15.12.3, abstract operation `JO` (http://es5.github.com/#x15.12.3)
-      stackA || (stackA = []);
+      var initStack = !stackA;
-      stackB || (stackB = []);
+      stackA || (stackA = getArray());
+      stackB || (stackB = getArray());
 
       var length = stackA.length;
       while (length--) {
@@ -1908,6 +2007,10 @@
           }
         });
       }
+      if (initStack) {
+        releaseArray(stackA);
+        releaseArray(stackB);
+      }
       return result;
     }
 
@@ -2217,8 +2320,9 @@
             stackA = args[4],
             stackB = args[5];
       } else {
-        stackA = [];
+        var initStack = true;
-        stackB = [];
+        stackA = getArray();
+        stackB = getArray();
 
         // allows working with `_.reduce` and `_.reduceRight` without
         // using their `callback` arguments, `index|key` and `collection`
@@ -2284,6 +2388,11 @@
           object[key] = value;
         });
       }
+
+      if (initStack) {
+        releaseArray(stackA);
+        releaseArray(stackB);
+      }
       return object;
     }
 
@@ -3443,17 +3552,18 @@
 
       callback = lodash.createCallback(callback, thisArg);
       forEach(collection, function(value, key, collection) {
-        result[++index] = {
+        var object = result[++index] = getObject();
-          'criteria': callback(value, key, collection),
+        object.criteria = callback(value, key, collection);
-          'index': index,
+        object.index = index;
-          'value': value
+        object.value = value;
-        };
       });
 
       length = result.length;
       result.sort(compareAscending);
       while (length--) {
-        result[length] = result[length].value;
+        var object = result[length];
+        result[length] = object.value;
+        releaseObject(object);
       }
       return result;
     }
@@ -3555,15 +3665,16 @@
       var index = -1,
           length = array ? array.length : 0,
           flattened = concat.apply(arrayProto, nativeSlice.call(arguments, 1)),
-          contains = createCache(flattened).contains,
+          cache = createCache(flattened),
           result = [];
 
       while (++index < length) {
         var value = array[index];
-        if (!contains(value)) {
+        if (!cache.contains(value)) {
           result.push(value);
         }
       }
+      cache.release();
       return result;
     }
 
@@ -3867,27 +3978,35 @@
     function intersection(array) {
       var args = arguments,
           argsLength = args.length,
-          cache = createCache(),
+          caches = getArray(),
-          caches = {},
           index = -1,
           length = array ? array.length : 0,
           isLarge = length >= largeArraySize,
           result = [];
 
+      caches[0] = createCache();
+
       outer:
       while (++index < length) {
-        var value = array[index];
+        var cache = caches[0],
+            value = array[index];
+
         if (!cache.contains(value)) {
           var argsIndex = argsLength;
           cache.push(value);
           while (--argsIndex) {
-            if (!(caches[argsIndex] || (caches[argsIndex] = createCache(args[argsIndex]).contains))(value)) {
+            cache = caches[argsIndex] || (caches[argsIndex] = createCache(args[argsIndex]));
+            if (!cache.contains(value)) {
               continue outer;
             }
           }
           result.push(value);
         }
       }
+      while (argsLength--) {
+        caches[argsLength].release();
+      }
+      releaseArray(caches);
       return result;
     }
 
@@ -4257,11 +4376,11 @@
      */
     var uniq = overloadWrapper(function(array, isSorted, callback) {
       var index = -1,
-          indexOf = getIndexOf(),
           length = array ? array.length : 0,
           isLarge = !isSorted && length >= largeArraySize,
+          indexOf = isLarge || getIndexOf(),
           result = [],
-          seen = isLarge ? createCache() : (callback ? [] : result);
+          seen = isLarge ? createCache() : (callback ? getArray() : result);
 
       while (++index < length) {
         var value = array[index],
@@ -4277,6 +4396,11 @@
           result.push(value);
         }
       }
+      if (isLarge) {
+        seen.release();
+      } else if (callback) {
+        releaseArray(seen);
+      }
       return result;
     });