Update changelog with intersect removal.

Former-commit-id: 5902c720c1403b856ac213e293619c31ea6834f5

README.md

@@ -1,6 +1,6 @@
-# Lo-Dash <sup>v0.2.0</sup>
+# Lo-Dash <sup>v0.2.1</sup>
 
-A drop-in replacement for Underscore.js, from the devs behind [jsPerf.com](http://jsperf.com), that delivers [performance improvements](http://jsperf.com/lodash-underscore#filterby=family), bug fixes, and additional features.
+A drop-in replacement for Underscore.js, from the devs behind [jsPerf.com](http://jsperf.com), that delivers [performance improvements](http://jsperf.com/lodash-underscore#filterby=family), [bug fixes](https://github.com/bestiejs/lodash#closed-underscorejs-issues), and [additional features](https://github.com/bestiejs/lodash#features).
 
 Lo-Dash’s performance is gained by avoiding slower native methods, instead opting for simplified non-ES5 compliant methods optimized for common usage, and by leveraging function compilation to reduce the number of overall function calls.
 
@@ -23,9 +23,9 @@ For more information check out these screencasts over Lo-Dash:
  * [_.bind](http://lodash.com/docs#_bindfunc--arg1-arg2-) supports *"lazy"* binding
  * [_.debounce](http://lodash.com/docs#_debouncefunc-wait-immediate)’ed functions match [_.throttle](http://lodash.com/docs#_throttlefunc-wait)’ed functions’ return value behavior
  * [_.forEach](http://lodash.com/docs#_foreachcollection-callback--thisarg) is chainable
- * [_.groupBy](http://lodash.com/docs#_groupbycollection-callback--thisarg) accepts a third `thisArg` argument
+ * [_.groupBy](http://lodash.com/docs#_groupbycollection-callback--thisarg) accepts a third, `thisArg`, argument
  * [_.partial](http://lodash.com/docs#_partialfunc--arg1-arg2-) for more functional fun
- * [_.size](http://lodash.com/docs#_sizecollection) returns the `length` of string values
+ * [_.size](http://lodash.com/docs#_sizecollection) supports returning the `length` of string values
 
 ## Support
 
@@ -116,14 +116,16 @@ git submodule update --init
 
 ## Closed Underscore.js issues
 
- * Fix Firefox, IE, Opera, and Safari object iteration bugs [#376](https://github.com/documentcloud/underscore/issues/376)
- * Handle arrays with `undefined` values correctly in IE < 9 [#601](https://github.com/documentcloud/underscore/issues/601)
- * Methods should work on pages with incorrectly shimmed native methods [#7](https://github.com/documentcloud/underscore/issues/7)
- * Register as AMD module, but still export to global [#431](https://github.com/documentcloud/underscore/pull/431)
- * `_.forEach` should be chainable [#142](https://github.com/documentcloud/underscore/issues/142)
- * `_isNaN(new Number(NaN))` should return `true`
- * `_.reduceRight` should pass correct callback arguments when iterating objects
- * `_.size` should return the `length` of string values
+ * Ensure `_.groupBy` adds values to own, not inherited, properties [[test](https://github.com/bestiejs/lodash/blob/32627f45072952df18a64cf5e9f2433d2d32730f/test/test.js#L229-236)]
+ * Ensure `_.throttle` works when called in tight loops [[#502](https://github.com/documentcloud/underscore/issues/502), [test](https://github.com/bestiejs/lodash/blob/32627f45072952df18a64cf5e9f2433d2d32730f/test/test.js#L436-446)]
+ * Fix Firefox, IE, Opera, and Safari object iteration bugs [[#376](https://github.com/documentcloud/underscore/issues/376), [test](https://github.com/bestiejs/lodash/blob/32627f45072952df18a64cf5e9f2433d2d32730f/test/test.js#L152-172), [test](https://github.com/bestiejs/lodash/blob/32627f45072952df18a64cf5e9f2433d2d32730f/test/test.js#L206-213), [test](https://github.com/bestiejs/lodash/blob/32627f45072952df18a64cf5e9f2433d2d32730f/test/test.js#L255-257), [test](https://github.com/bestiejs/lodash/blob/32627f45072952df18a64cf5e9f2433d2d32730f/test/test.js#L265-267), [test](https://github.com/bestiejs/lodash/blob/32627f45072952df18a64cf5e9f2433d2d32730f/test/test.js#L285-292), [test](https://github.com/bestiejs/lodash/blob/32627f45072952df18a64cf5e9f2433d2d32730f/test/test.js#L386-388)]
+ * Handle arrays with `undefined` values correctly in IE < 9 [[#601](https://github.com/documentcloud/underscore/issues/601)]
+ * Methods should work on pages with incorrectly shimmed native methods [[#7](https://github.com/documentcloud/underscore/issues/7), [test](https://github.com/bestiejs/lodash/blob/32627f45072952df18a64cf5e9f2433d2d32730f/test/test.js#L77-83)]
+ * Register as AMD module, but still export to global [[#431](https://github.com/documentcloud/underscore/pull/431), [test](https://github.com/bestiejs/lodash/blob/32627f45072952df18a64cf5e9f2433d2d32730f/test/test.js#L61-75)]
+ * `_.forEach` should be chainable [[#142](https://github.com/documentcloud/underscore/issues/142), [test](https://github.com/bestiejs/lodash/blob/5bcd444084c92b1753feeaf66c20323e57a2dac3/test/test.js#L74-77)]
+ * `_isNaN(new Number(NaN))` should return `true` [[test](https://github.com/bestiejs/lodash/blob/5bcd444084c92b1753feeaf66c20323e57a2dac3/test/test.js#L95-99)]
+ * `_.reduceRight` should pass correct callback arguments when iterating objects [[test](https://github.com/bestiejs/lodash/blob/5bcd444084c92b1753feeaf66c20323e57a2dac3/test/test.js#L106-116)]
+ * `_.size` should return the `length` of string values [[test](https://github.com/bestiejs/lodash/blob/5bcd444084c92b1753feeaf66c20323e57a2dac3/test/test.js#L121-127)]
 
 ## Optimized methods <sup>(50+)</sup>
 
@@ -146,7 +148,7 @@ git submodule update --init
  * `_.functions`, `_.methods`
  * `_.groupBy`
  * `_.indexOf`
- * `_.intersection`, `_.intersect`
+ * `_.intersection`
  * `_.invoke`
  * `_.isEmpty`
  * `_.isEqual`
@@ -182,6 +184,14 @@ git submodule update --init
 
 ## Changelog
 
+### <sup>v0.2.1</sup>
+
+* Adjusted the Lo-Dash export order for r.js
+* Ensured `_.groupBy` values are added to own, not inherited, properties
+* Made `_.bind` follow ES5 spec to support a popular Backbone.js pattern
+* Removed the alias `intersect`
+* Simplified `_.bind`, `_.flatten`, `_.groupBy`, `_.max`, and `_.min`
+
 ### <sup>v0.2.0</sup>
 
  * Added custom build options
@@ -189,11 +199,12 @@ git submodule update --init
  * Added *"lazy bind"* support to `_.bind`
  * Added native method overwrite detection to avoid bad native shims
  * Added support for more AMD build optimizers and aliasing as the *"underscore"* module
- * Added `thisArg` to `_.groupBy`
+ * Added `thisArg` argument to `_.groupBy`
  * Added whitespace to compiled strings
- * Added `_.partial`
+ * Added `_.partial` method
  * Commented the `iterationFactory` options object
  * Ensured `_.max` and `_.min` support extremely large arrays
+ * Ensured `_.throttle` works in tight loops
  * Fixed IE < 9 `[DontEnum]` bug and Firefox < 3.6, Opera > 9.50 - Opera < 11.60, and Safari < 5.1’s prototype property iteration bug
  * Inlined `_.isFunction` calls.
  * Made `_.debounce`’ed functions match `_.throttle`’ed functions’ return value behavior

build.js

@@ -31,7 +31,6 @@
     'head': 'first',
     'include': 'contains',
     'inject': 'reduce',
-    'intersect': 'intersection',
     'methods': 'functions',
     'select': 'filter',
     'tail': 'rest',
@@ -48,7 +47,6 @@
     'first': ['head', 'take'],
     'forEach': ['each'],
     'functions': ['methods'],
-    'intersection': ['intersect'],
     'map': ['collect'],
     'reduce': ['foldl', 'inject'],
     'reduceRight': ['foldr'],
@@ -416,11 +414,6 @@
       // remove `templateSettings` assignment
       source = source.replace(/(?:\n +\/\*[^*]*\*+(?:[^\/][^*]*\*+)*\/)?\n *lodash\.templateSettings[\s\S]+?};\n/, '');
     }
-    if (isRemoved(source, 'max', 'min')) {
-      source = removeVar(source, 'argsLimit');
-      // remove `argsLimit` try-catch
-      source = source.replace(/\n *try\s*\{[\s\S]+?argsLimit *=[\s\S]+?catch[^}]+}\n/, '');
-    }
     if (isRemoved(source, 'isArray', 'isEmpty', 'isEqual', 'size')) {
       source = removeVar(source, 'arrayClass');
     }

build/pre-compile.js

@@ -8,33 +8,24 @@
   /** Used to minify variables embedded in compiled strings */
   var compiledVars = [
     'accumulator',
-    'args',
-    'array',
     'arrayClass',
     'bind',
     'callback',
     'className',
     'collection',
-    'concat',
     'ctor',
     'false',
     'funcClass',
     'hasOwnProperty',
     'identity',
     'index',
-    'indexOf',
-    'isArray',
-    'isEmpty',
-    'isFunc',
     'length',
     'object',
     'objectTypes',
     'noaccum',
-    'prop',
     'property',
     'result',
     'skipProto',
-    'slice',
     'source',
     'sourceIndex',
     'stringClass',
@@ -119,7 +110,6 @@
     'initial',
     'inject',
     'interpolate',
-    'intersect',
     'intersection',
     'invoke',
     'isArguments',
@@ -177,7 +167,6 @@
     'throttle',
     'times',
     'toArray',
-    'toArray',
     'union',
     'uniq',
     'unique',

doc/parse.php

@@ -21,7 +21,7 @@
   // generate Markdown
   $markdown = docdown(array(
     'path' => '../' . $file,
-    'title' => 'Lo-Dash <sup>v0.2.0</sup>',
+    'title' => 'Lo-Dash <sup>v0.2.1</sup>',
     'url'  => 'https://github.com/bestiejs/lodash/blob/master/lodash.js'
   ));
 

lodash.js

@@ -1,5 +1,5 @@
 /*!
- * Lo-Dash v0.2.0 <http://lodash.com>
+ * Lo-Dash v0.2.1 <http://lodash.com>
  * Copyright 2012 John-David Dalton <http://allyoucanleet.com/>
  * Based on Underscore.js 1.3.3, copyright 2009-2012 Jeremy Ashkenas, DocumentCloud Inc.
  * <http://documentcloud.github.com/underscore>
@@ -12,30 +12,6 @@
   var freeExports = typeof exports == 'object' && exports &&
     (typeof global == 'object' && global && global == global.global && (window = global), exports);
 
-  /**
-   * Used to detect the JavaScript engine's argument length limit.
-   *
-   * The initial value of `argsLimit` is low enough not to cause uncatchable
-   * errors in Java and avoid locking up older browsers like Safari 3.
-   *
-   * Some engines have a limit on the number of arguments functions can accept
-   * before clipping the argument length or throwing an error.
-   * https://bugs.webkit.org/show_bug.cgi?id=80797
-   *
-   * For example Firefox's limits have been observed to be at least:
-   *   Firefox 2    - 35,535
-   *   Firefox 3.6  - 16,777,215
-   *   Firefox 4-7  - 523,264
-   *   Firefox >= 8 - Throws error
-   */
-  var argsLimit = 5e4;
-
-  try {
-    (function() {
-      argsLimit = arguments.length;
-    }).apply(null, Array(argsLimit));
-  } catch(e) { }
-
   /** Used to escape characters in templates */
   var escapes = {
     '\\': '\\',
@@ -70,15 +46,6 @@
   /** Used to restore the original `_` reference in `noConflict` */
   var oldDash = window._;
 
-  /** Used to match the "escape" template delimiters */
-  var reEscapeDelimiter = /<%-([\s\S]+?)%>/g;
-
-  /** Used to match the "evaluate" template delimiters */
-  var reEvaluateDelimiter = /<%([\s\S]+?)%>/g;
-
-  /** Used to match the "interpolate" template delimiters */
-  var reInterpolateDelimiter = /<%=([\s\S]+?)%>/g;
-
   /** Used to detect if a method is native */
   var reNative = RegExp('^' + ({}.valueOf + '')
     .replace(/[.*+?^=!:${}()|[\]\/\\]/g, '\\$&')
@@ -137,6 +104,83 @@
 
   /*--------------------------------------------------------------------------*/
 
+  /**
+   * The `lodash` function.
+   *
+   * @name _
+   * @constructor
+   * @param {Mixed} value The value to wrap in a `LoDash` instance.
+   * @returns {Object} Returns a `LoDash` instance.
+   */
+  function lodash(value) {
+    // allow invoking `lodash` without the `new` operator
+    return new LoDash(value);
+  }
+
+  /**
+   * Creates a `LoDash` instance that wraps a value to allow chaining.
+   *
+   * @private
+   * @constructor
+   * @param {Mixed} value The value to wrap.
+   */
+  function LoDash(value) {
+    // exit early if already wrapped
+    if (value && value._wrapped) {
+      return value;
+    }
+    this._wrapped = value;
+  }
+
+  /**
+   * By default, Lo-Dash uses ERB-style template delimiters, change the
+   * following template settings to use alternative delimiters.
+   *
+   * @static
+   * @memberOf _
+   * @type Object
+   */
+  lodash.templateSettings = {
+
+    /**
+     * Used to detect `data` property values to be HTML-escaped.
+     *
+     * @static
+     * @memberOf _.templateSettings
+     * @type RegExp
+     */
+    'escape': /<%-([\s\S]+?)%>/g,
+
+    /**
+     * Used to detect code to be evaluated.
+     *
+     * @static
+     * @memberOf _.templateSettings
+     * @type RegExp
+     */
+    'evaluate': /<%([\s\S]+?)%>/g,
+
+    /**
+     * Used to detect `data` property values to inject.
+     *
+     * @static
+     * @memberOf _.templateSettings
+     * @type RegExp
+     */
+    'interpolate': /<%=([\s\S]+?)%>/g,
+
+    /**
+     * Used to reference the data object in the template text.
+     *
+     * @static
+     * @memberOf _.templateSettings
+     * @type String
+     */
+    'variable': 'object'
+  };
+
+  /*--------------------------------------------------------------------------*/
+
   /**
    * The template used to create iterator functions.
    *
@@ -213,11 +257,7 @@
     '<%= bottom %>;\n' +
     // finally, return the `result`
     'return result'
-
-    , null, {
-    'evaluate': reEvaluateDelimiter,
-    'interpolate': reInterpolateDelimiter
-  });
+  );
 
   /**
    * Reusable iterator options shared by
@@ -278,86 +318,6 @@
 
   /*--------------------------------------------------------------------------*/
 
-  /**
-   * The `lodash` function.
-   *
-   * @name _
-   * @constructor
-   * @param {Mixed} value The value to wrap in a `LoDash` instance.
-   * @returns {Object} Returns a `LoDash` instance.
-   */
-  function lodash(value) {
-    // allow invoking `lodash` without the `new` operator
-    return new LoDash(value);
-  }
-
-  /**
-   * Creates a `LoDash` instance that wraps a value to allow chaining.
-   *
-   * @private
-   * @constructor
-   * @param {Mixed} value The value to wrap.
-   */
-  function LoDash(value) {
-    // exit early if already wrapped
-    if (value && value._wrapped) {
-      return value;
-    }
-    this._wrapped = value;
-  }
-
-  /*--------------------------------------------------------------------------*/
-
-  /**
-   * Checks if a `value` is an array.
-   *
-   * @static
-   * @memberOf _
-   * @category Objects
-   * @param {Mixed} value The value to check.
-   * @returns {Boolean} Returns `true` if the `value` is an array, else `false`.
-   * @example
-   *
-   * (function() { return _.isArray(arguments); })();
-   * // => false
-   *
-   * _.isArray([1, 2, 3]);
-   * // => true
-   */
-  var isArray = nativeIsArray || function(value) {
-    return toString.call(value) == arrayClass;
-  };
-
-  /**
-   * Checks if a `value` is empty. Arrays or strings with a length of `0` and
-   * objects with no enumerable own properties are considered "empty".
-   *
-   * @static
-   * @memberOf _
-   * @category Objects
-   * @param {Mixed} value The value to check.
-   * @returns {Boolean} Returns `true` if the `value` is empty, else `false`.
-   * @example
-   *
-   * _.isEmpty([1, 2, 3]);
-   * // => false
-   *
-   * _.isEmpty({});
-   * // => true
-   */
-  var isEmpty = createIterator({
-    'args': 'value',
-    'init': 'true',
-    'top':
-      'var className = toString.call(value);\n' +
-      'if (className == arrayClass || className == stringClass) return !value.length',
-    'inLoop': {
-      'object': 'return false'
-    }
-  });
-
-  /*--------------------------------------------------------------------------*/
-
   /**
    * Creates compiled iteration functions. The iteration function will be created
    * to iterate over only objects if the first argument of `options.args` is
@@ -407,8 +367,8 @@
       'exit': '',
       'init': '',
       'top': '',
-      'arrayBranch': { 'loopExp': '++index < length' },
-      'objectBranch': {}
+      'arrayBranch': { 'beforeLoop': '', 'loopExp': '++index < length' },
+      'objectBranch': { 'beforeLoop': '' }
     };
 
     while (++index < length) {
@@ -443,7 +403,7 @@
     data.useHas = data.useHas !== false;
 
     if (!data.exit) {
-      data.exit = 'if (' + firstArg + ' == null) return result';
+      data.exit = 'if (!' + firstArg + ') return result';
     }
     if (firstArg == 'object' || !arrayBranch.inLoop) {
       data.arrayBranch = null;
@@ -453,14 +413,14 @@
     }
     // create the function factory
     var factory = Function(
-        'arrayClass, bind, concat, funcClass, hasOwnProperty, identity, indexOf, ' +
-        'isArray, isEmpty, objectTypes, slice, stringClass, toString, undefined',
+        'arrayClass, bind, funcClass, hasOwnProperty, identity, objectTypes, ' +
+        'stringClass, toString, undefined',
       '"use strict"; return function(' + args + ') {\n' + iteratorTemplate(data) + '\n}'
     );
     // return the compiled function
     return factory(
-      arrayClass, bind, concat, funcClass, hasOwnProperty, identity, indexOf,
-      isArray, isEmpty, objectTypes, slice, stringClass, toString
+      arrayClass, bind, funcClass, hasOwnProperty, identity, objectTypes,
+      stringClass, toString
     );
   }
 
@@ -488,6 +448,15 @@
     return '\\' + escapes[match];
   }
 
+  /**
+   * A no-operation function.
+   *
+   * @private
+   */
+  function noop() {
+    // no operation performed
+  }
+
   /**
    * Used by `template()` to replace "escape" template delimiters with tokens.
    *
@@ -645,43 +614,6 @@
     'top': 'if (thisArg) callback = bind(callback, thisArg)'
   });
 
-  /**
-   * Splits a `collection` into sets, grouped by the result of running each value
-   * through `callback`. The `callback` is invoked with 3 arguments; for arrays
-   * they are (value, index, array) and for objects they are (value, key, object).
-   * The `callback` argument may also be the name of a property to group by.
-   *
-   * @static
-   * @memberOf _
-   * @category Collections
-   * @param {Array|Object} collection The collection to iterate over.
-   * @param {Function|String} callback The function called per iteration or
-   *  property name to group by.
-   * @param {Mixed} [thisArg] The `this` binding for the callback.
-   * @returns {Object} Returns an object of grouped values.
-   * @example
-   *
-   * _.groupBy([1.3, 2.1, 2.4], function(num) { return Math.floor(num); });
-   * // => { '1': [1.3], '2': [2.1, 2.4] }
-   *
-   * _.groupBy([1.3, 2.1, 2.4], function(num) { return this.floor(num); }, Math);
-   * // => { '1': [1.3], '2': [2.1, 2.4] }
-   *
-   * _.groupBy(['one', 'two', 'three'], 'length');
-   * // => { '3': ['one', 'two'], '5': ['three'] }
-   */
-  var groupBy = createIterator(baseIteratorOptions, {
-    'init': '{}',
-    'top':
-      'var prop, isFunc = toString.call(callback) == funcClass;\n' +
-      'if (isFunc && thisArg) callback = bind(callback, thisArg)',
-    'inLoop':
-      'prop = isFunc\n' +
-      '  ? callback(collection[index], index, collection)\n' +
-      '  : collection[index][callback];\n' +
-      '(result[prop] || (result[prop] = [])).push(collection[index])'
-  });
-
   /**
    * Produces a new array of values by mapping each value in the `collection`
    * through a transformation `callback`. The `callback` is bound to the `thisArg`
@@ -853,81 +785,6 @@
     'inLoop': '!' + filterIteratorOptions.inLoop
   });
 
-  /**
-   * Gets the number of values in the `collection` or the `length` of a string value.
-   *
-   * @static
-   * @memberOf _
-   * @category Collections
-   * @param {Array|Object} collection The collection inspect.
-   * @returns {Number} Returns the number of values in the collection.
-   * @example
-   *
-   * _.size([1, 2]);
-   * // => 2
-   *
-   * _.size({ 'one': 1, 'two': 2, 'three': 3 });
-   * // => 3
-   *
-   * _.size('curly');
-   * // => 5
-   */
-  function size(collection) {
-    var className = toString.call(collection);
-    return className == arrayClass || className == stringClass
-      ? collection.length
-      : keys(collection).length;
-  }
-
-  /**
-   * Produces a new sorted array, ranked in ascending order by the results of
-   * running each value of a `collection` through `callback`. The `callback` is
-   * invoked with 3 arguments; for arrays they are (value, index, array) and for
-   * objects they are (value, key, object). The `callback` argument may also be
-   * the name of a property to sort by (e.g. 'length').
-   *
-   * @static
-   * @memberOf _
-   * @category Collections
-   * @param {Array|Object} collection The collection to iterate over.
-   * @param {Function|String} callback The function called per iteration or
-   *  property name to sort by.
-   * @param {Mixed} [thisArg] The `this` binding for the callback.
-   * @returns {Array} Returns a new array of sorted values.
-   * @example
-   *
-   * _.sortBy([1, 2, 3, 4, 5, 6], function(num) { return Math.sin(num); });
-   * // => [5, 4, 6, 3, 1, 2]
-   *
-   * _.sortBy([1, 2, 3, 4, 5, 6], function(num) { return this.sin(num); }, Math);
-   * // => [5, 4, 6, 3, 1, 2]
-   */
-  function sortBy(collection, callback, thisArg) {
-    if (toString.call(callback) != funcClass) {
-      var prop = callback;
-      callback = function(collection) { return collection[prop]; };
-    } else if (thisArg) {
-      callback = bind(callback, thisArg);
-    }
-    return pluck(map(collection, function(value, index) {
-      return {
-        'criteria': callback(value, index, collection),
-        'value': value
-      };
-    }).sort(function(left, right) {
-      var a = left.criteria,
-          b = right.criteria;
-
-      if (a === undefined) {
-        return 1;
-      }
-      if (b === undefined) {
-        return -1;
-      }
-      return a < b ? -1 : a > b ? 1 : 0;
-    }), 'value');
-  }
-
   /**
    * Checks if the `callback` returns a truthy value for **any** element of a
    * `collection`. The function returns as soon as it finds passing value, and
@@ -1104,9 +961,6 @@
    * // => [1, 2, 3, [[4]]];
    */
   function flatten(array, shallow) {
-    if (shallow) {
-      return concat.apply(ArrayProto, array);
-    }
     var value,
         index = -1,
         length = array.length,
@@ -1115,7 +969,7 @@
     while (++index < length) {
       value = array[index];
       if (isArray(value)) {
-        push.apply(result, flatten(value));
+        push.apply(result, shallow ? value : flatten(value));
       } else {
         result.push(value);
       }
@@ -1123,6 +977,99 @@
     return result;
   }
 
+  /**
+   * Splits a `collection` into sets, grouped by the result of running each value
+   * through `callback`. The `callback` is invoked with 3 arguments;
+   * (value, index, array). The `callback` argument may also be the name of a
+   * property to group by.
+   *
+   * @static
+   * @memberOf _
+   * @category Arrays
+   * @param {Array} array The array to iterate over.
+   * @param {Function|String} callback The function called per iteration or
+   *  property name to group by.
+   * @param {Mixed} [thisArg] The `this` binding for the callback.
+   * @returns {Object} Returns an object of grouped values.
+   * @example
+   *
+   * _.groupBy([1.3, 2.1, 2.4], function(num) { return Math.floor(num); });
+   * // => { '1': [1.3], '2': [2.1, 2.4] }
+   *
+   * _.groupBy([1.3, 2.1, 2.4], function(num) { return this.floor(num); }, Math);
+   * // => { '1': [1.3], '2': [2.1, 2.4] }
+   *
+   * _.groupBy(['one', 'two', 'three'], 'length');
+   * // => { '3': ['one', 'two'], '5': ['three'] }
+   */
+  function groupBy(array, callback, thisArg) {
+    var prop,
+        value,
+        index = -1,
+        isFunc = toString.call(callback) == funcClass,
+        length = array.length,
+        result = {};
+
+    if (isFunc && thisArg) {
+      callback = bind(callback, thisArg);
+    }
+    while (++index < length) {
+      value = array[index];
+      prop = isFunc ? callback(value, index, array) : value[callback];
+      (hasOwnProperty.call(result, prop) ? result[prop] : result[prop] = []).push(value);
+    }
+    return result
+  }
+
+  /**
+   * Produces a new sorted array, ranked in ascending order by the results of
+   * running each value of a `collection` through `callback`. The `callback` is
+   * invoked with 3 arguments; for arrays they are (value, index, array) and for
+   * objects they are (value, key, object). The `callback` argument may also be
+   * the name of a property to sort by (e.g. 'length').
+   *
+   * @static
+   * @memberOf _
+   * @category Arrays
+   * @param {Array} array The array to iterate over.
+   * @param {Function|String} callback The function called per iteration or
+   *  property name to sort by.
+   * @param {Mixed} [thisArg] The `this` binding for the callback.
+   * @returns {Array} Returns a new array of sorted values.
+   * @example
+   *
+   * _.sortBy([1, 2, 3, 4, 5, 6], function(num) { return Math.sin(num); });
+   * // => [5, 4, 6, 3, 1, 2]
+   *
+   * _.sortBy([1, 2, 3, 4, 5, 6], function(num) { return this.sin(num); }, Math);
+   * // => [5, 4, 6, 3, 1, 2]
+   */
+  function sortBy(array, callback, thisArg) {
+    if (toString.call(callback) != funcClass) {
+      var prop = callback;
+      callback = function(array) { return array[prop]; };
+    } else if (thisArg) {
+      callback = bind(callback, thisArg);
+    }
+    return pluck(map(array, function(value, index) {
+      return {
+        'criteria': callback(value, index, array),
+        'value': value
+      };
+    }).sort(function(left, right) {
+      var a = left.criteria,
+          b = right.criteria;
+
+      if (a === undefined) {
+        return 1;
+      }
+      if (b === undefined) {
+        return -1;
+      }
+      return a < b ? -1 : a > b ? 1 : 0;
+    }), 'value');
+  }
+
   /**
    * Gets the index at which the first occurrence of `value` is found using
    * strict equality for comparisons, i.e. `===`. If the `array` is already
@@ -1183,7 +1130,6 @@
    *
    * @static
    * @memberOf _
-   * @alias intersect
    * @category Arrays
    * @param {Array} [array1, array2, ...] Arrays to process.
    * @returns {Array} Returns a new array of unique values, in order, that are
@@ -1321,22 +1267,18 @@
         result = computed;
 
     if (!callback) {
-      // fast path for arrays of numbers
-      if (array[0] === +array[0] && length <= argsLimit) {
-        // some JavaScript engines have a limit on the number of arguments functions
-        // can accept before clipping the argument length or throwing an error
-        try {
-          return Math.max.apply(Math, array);
-        } catch(e) { }
+      while (++index < length) {
+        if (array[index] > result) {
+          result = array[index];
+        }
       }
-      if (!array.length) {
-        return result;
-      }
-    } else if (thisArg) {
+      return result;
+    }
+    if (thisArg) {
       callback = bind(callback, thisArg);
     }
     while (++index < length) {
-      current = callback ? callback(array[index], index, array) : array[index];
+      current = callback(array[index], index, array);
       if (current > computed) {
         computed = current;
         result = array[index];
@@ -1371,19 +1313,18 @@
         result = computed;
 
     if (!callback) {
-      if (array[0] === +array[0] && length <= argsLimit) {
-        try {
-          return Math.min.apply(Math, array);
-        } catch(e) { }
+      while (++index < length) {
+        if (array[index] < result) {
+          result = array[index];
+        }
       }
-      if (!array.length) {
-        return result;
-      }
-    } else if (thisArg) {
+      return result;
+    }
+    if (thisArg) {
       callback = bind(callback, thisArg);
     }
     while (++index < length) {
-      current = callback ? callback(array[index], index, array) : array[index];
+      current = callback(array[index], index, array);
       if (current < computed) {
         computed = current;
         result = array[index];
@@ -1584,9 +1525,6 @@
         result = [],
         seen = [];
 
-    if (length < 3) {
-      isSorted = true;
-    }
     while (++index < length) {
       computed = callback ? callback(array[index]) : array[index];
       if (isSorted
@@ -1739,33 +1677,41 @@
     }
     // use if `Function#bind` is faster
     else if (nativeBind) {
-      func = nativeBind.call.apply(nativeBind, arguments);
-      return function() {
-        return arguments.length ? func.apply(undefined, arguments) : func();
-      };
+      return nativeBind.call.apply(nativeBind, arguments);
     }
 
-    var partialArgs = slice.call(arguments, 2),
-        partialArgsLength = partialArgs.length;
+    var partialArgs = slice.call(arguments, 2);
 
-    return function() {
-      var result,
-          args = arguments;
+    function bound() {
+      // `Function#bind` spec
+      // http://es5.github.com/#x15.3.4.5
+      var args = arguments,
+          thisBinding = thisArg;
 
       if (!isFunc) {
         func = thisArg[methodName];
       }
-      if (partialArgsLength) {
-        if (args.length) {
-          partialArgs.length = partialArgsLength;
-          push.apply(partialArgs, args);
-        }
-        args = partialArgs;
+      if (partialArgs.length) {
+        args = args.length
+          ? concat.apply(partialArgs, args)
+          : partialArgs;
       }
-      result = args.length ? func.apply(thisArg, args) : func.call(thisArg);
-      partialArgs.length = partialArgsLength;
-      return result;
-    };
+      if (this instanceof bound) {
+        // get `func` instance if `bound` is invoked in a `new` expression
+        noop.prototype = func.prototype;
+        thisBinding = new noop;
+
+        // mimic the constructor's `return` behavior
+        // http://es5.github.com/#x13.2.2
+        var result = func.apply(thisBinding, args);
+        return objectTypes[typeof result] && result !== null
+          ? result
+          : thisBinding
+      }
+      return func.apply(thisBinding, args);
+    }
+
+    return bound;
   }
 
   /**
@@ -2229,6 +2175,26 @@
     };
   }
 
+  /**
+   * Checks if a `value` is an array.
+   *
+   * @static
+   * @memberOf _
+   * @category Objects
+   * @param {Mixed} value The value to check.
+   * @returns {Boolean} Returns `true` if the `value` is an array, else `false`.
+   * @example
+   *
+   * (function() { return _.isArray(arguments); })();
+   * // => false
+   *
+   * _.isArray([1, 2, 3]);
+   * // => true
+   */
+  var isArray = nativeIsArray || function(value) {
+    return toString.call(value) == arrayClass;
+  };
+
   /**
    * Checks if a `value` is a boolean (`true` or `false`) value.
    *
@@ -2280,6 +2246,34 @@
     return !!(value && value.nodeType == 1);
   }
 
+  /**
+   * Checks if a `value` is empty. Arrays or strings with a length of `0` and
+   * objects with no enumerable own properties are considered "empty".
+   *
+   * @static
+   * @memberOf _
+   * @category Objects
+   * @param {Array|Object|String} value The value to inspect.
+   * @returns {Boolean} Returns `true` if the `value` is empty, else `false`.
+   * @example
+   *
+   * _.isEmpty([1, 2, 3]);
+   * // => false
+   *
+   * _.isEmpty({});
+   * // => true
+   */
+  var isEmpty = createIterator({
+    'args': 'value',
+    'init': 'true',
+    'top':
+      'var className = toString.call(value);\n' +
+      'if (className == arrayClass || className == stringClass) return !value.length',
+    'inLoop': {
+      'object': 'return false'
+    }
+  });
+
   /**
    * Performs a deep comparison between two values to determine if they are
    * equivalent to each other.
@@ -2669,6 +2663,35 @@
     return result;
   }
 
+  /**
+   * Gets the size of a `value` by returning `value.length` if `value` is a
+   * string or array, or the number of own enumerable properties if `value` is
+   * an object.
+   *
+   * @static
+   * @memberOf _
+   * @category Objects
+   * @param {Array|Object|String} value The value to inspect.
+   * @returns {Number} Returns `value.length` if `value` is a string or array,
+   *  or the number of own enumerable properties if `value` is an object.
+   * @example
+   *
+   * _.size([1, 2]);
+   * // => 2
+   *
+   * _.size({ 'one': 1, 'two': 2, 'three': 3 });
+   * // => 3
+   *
+   * _.size('curly');
+   * // => 5
+   */
+  function size(value) {
+    var className = toString.call(value);
+    return className == arrayClass || className == stringClass
+      ? value.length
+      : keys(value).length;
+  }
+
   /**
    * Invokes `interceptor` with the `value` as the first argument, and then returns
    * `value`. The primary purpose of this method is to "tap into" a method chain,
@@ -2724,7 +2747,7 @@
   }
 
   /**
-   * This function simply returns the first argument passed to it.
+   * This function returns the first argument passed to it.
    * Note: It is used throughout Lo-Dash as a default callback.
    *
    * @static
@@ -2889,7 +2912,7 @@
     options || (options = {});
 
     var result,
-        defaults = lodash.templateSettings || {},
+        defaults = lodash.templateSettings,
         escapeDelimiter = options.escape,
         evaluateDelimiter = options.evaluate,
         interpolateDelimiter = options.interpolate,
@@ -2926,7 +2949,7 @@
 
     // if `options.variable` is not specified, add `data` to the top of the scope chain
     if (!variable) {
-      variable = defaults.variable || 'object';
+      variable = defaults.variable;
       text = 'with (' + variable + ' || {}) {\n' + text + '\n}\n';
     }
 
@@ -3063,54 +3086,7 @@
    * @memberOf _
    * @type String
    */
-  lodash.VERSION = '0.2.0';
-
-  /**
-   * By default, Lo-Dash uses ERB-style template delimiters, change the
-   * following template settings to use alternative delimiters.
-   *
-   * @static
-   * @memberOf _
-   * @type Object
-   */
-  lodash.templateSettings = {
-
-    /**
-     * Used to detect `data` property values to be HTML-escaped.
-     *
-     * @static
-     * @memberOf _.templateSettings
-     * @type RegExp
-     */
-    'escape': reEscapeDelimiter,
-
-    /**
-     * Used to detect code to be evaluated.
-     *
-     * @static
-     * @memberOf _.templateSettings
-     * @type RegExp
-     */
-    'evaluate': reEvaluateDelimiter,
-
-    /**
-     * Used to detect `data` property values to inject.
-     *
-     * @static
-     * @memberOf _.templateSettings
-     * @type RegExp
-     */
-    'interpolate': reInterpolateDelimiter,
-
-    /**
-     * Used to reference the data object in the template text.
-     *
-     * @static
-     * @memberOf _.templateSettings
-     * @type String
-     */
-    'variable': 'object'
-  };
+  lodash.VERSION = '0.2.1';
 
   // assign static methods
   lodash.after = after;
@@ -3206,7 +3182,6 @@
   lodash.head = first;
   lodash.include = contains;
   lodash.inject = reduce;
-  lodash.intersect = intersection;
   lodash.methods = functions;
   lodash.select = filter;
   lodash.tail = rest;
@@ -3275,7 +3250,22 @@
   /*--------------------------------------------------------------------------*/
 
   // expose Lo-Dash
-  if (freeExports) {
+  // some AMD build optimizers, like r.js, check for specific condition patterns like the following:
+  if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
+    // Expose Lo-Dash to the global object even when an AMD loader is present in
+    // case Lo-Dash was injected by a third-party script and not intended to be
+    // loaded as a module. The global assignment can be reverted in the Lo-Dash
+    // module via its `noConflict()` method.
+    window._ = lodash;
+
+    // define as an anonymous module so, through path mapping, it can be
+    // referenced as the "underscore" module
+    define(function() {
+      return lodash;
+    });
+  }
+  // check for `exports` after `define` in case a build optimizer adds an `exports` object
+  else if (freeExports) {
     // in Node.js or RingoJS v0.8.0+
     if (typeof module == 'object' && module && module.exports == freeExports) {
       (module.exports = lodash)._ = lodash;
@@ -3285,21 +3275,8 @@
       freeExports._ = lodash;
     }
   }
-  // in a browser or Rhino
   else {
-    // Expose Lo-Dash to the global object even when an AMD loader is present in
-    // case Lo-Dash was injected by a third-party script and not intended to be
-    // loaded as a module. The global assignment can be reverted in the Lo-Dash
-    // module via its `noConflict()` method.
+    // in a browser or Rhino
     window._ = lodash;
-
-    // some AMD build optimizers, like r.js, check for specific condition patterns like the following:
-    if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
-      // define as an anonymous module so, through path mapping, it can be
-      // referenced as the "underscore" module
-      define(function() {
-        return lodash;
-      });
-    }
   }
 }(this));

lodash.min.js

@@ -1,30 +1,30 @@
 /*!
- Lo-Dash 0.2.0 lodash.com/license
+ Lo-Dash 0.2.1 lodash.com/license
  Underscore.js 1.3.3 github.com/documentcloud/underscore/blob/master/LICENSE
 */
-;(function(u,m){"use strict";function R(a){return"[object Arguments]"==h.call(a)}function c(a){return new p(a)}function p(a){if(a&&a._wrapped)return a;this._wrapped=a}function j(){for(var a,b,d,k=-1,c=arguments.length,f={e:"",f:"",k:"",q:"",c:{m:"++o<t"},o:{}};++k<c;)for(b in a=arguments[k],a)d=(d=a[b])==o?"":d,/d|m|j/.test(b)?("string"==typeof d&&(d={b:d,n:d}),f.c[b]=d.b,f.o[b]=d.n):f[b]=d;a=f.a,b=f.c,d=f.o;var k=/^[^,]+/.exec(a)[0],c=d.m,g=/\S+$/.exec(c||k)[0];f.g=k,f.i=H,f.h="m.call("+g+",o)",f
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+},b.invoke=function(a,c){for(var d=l.call(arguments,2),b=-1,f=a.length,e=i.call(c)==r,g=[];++b<f;)g[b]=(e?c:a[b][c]).apply(a[b],d);return g},b.isArguments=R,b.isArray=V,b.isBoolean=function(a){return a===m||a===q||i.call(a)==la},b.isDate=function(a){return i.call(a)==ma},b.isElement=function(a){return!!a&&1==a.nodeType},b.isEmpty=D,b.isEqual=M,b.isFinite=function(a){return Da(a)&&i.call(a)==N},b.isFunction=function(a){return i.call(a)==r},b.isNaN=function(a){return i.call(a)==N&&a!=+a},b.isNull=function(
+a){return a===o},b.isNumber=function(a){return i.call(a)==N},b.isObject=function(a){return I[typeof a]&&a!==o},b.isRegExp=function(a){return i.call(a)==na},b.isString=function(a){return i.call(a)==J},b.isUndefined=function(a){return a===n},b.keys=T,b.last=function(a,c,d){var b=a.length;return c==n||d?a[b-1]:l.call(a,-c||b)},b.lastIndexOf=function(a,c){if(!a)return-1;for(var d=a.length;d--;)if(a[d]===c)return d;return-1},b.map=aa,b.max=ia,b.memoize=function(a,c){var d={};return function(){var b=c?
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+():d},b.shuffle=function(a){for(var c,d=-1,b=a.length,f=Array(b);++d<b;)c=Math.floor(Math.random()*(d+1)),f[d]=f[c],f[c]=a[d];return f},b.size=function(a){var c=i.call(a);return c==H||c==J?a.length:T(a).length},b.some=t,b.sortBy=function(a,c,d){if(i.call(c)!=r)var b=c,c=function(a){return a[b]};else d&&(c=v(c,d));return Q(aa(a,function(b,d){return{a:c(b,d,a),b:b}}).sort(function(a,c){var b=a.a,d=c.a;return b===n?1:d===n?-1:b<d?-1:b>d?1:0}),"b")},b.sortedIndex=ha,b.tap=function(a,c){return c(a),a}
+,b.template=function(a,c,d){d||(d={});var j;j=b.templateSettings;var f=d.escape,e=d.evaluate,g=d.interpolate,d=d.variable;return f==o&&(f=j.escape),e==o&&(e=j.evaluate),g==o&&(g=j.interpolate),f&&(a=a.replace(f,wa)),g&&(a=a.replace(g,xa)),e&&(a=a.replace(e,ya)),a="__p='"+a.replace(Ca,ua).replace(Ba,ta)+"';\n",w.length=0,d||(d=j.variable,a="with("+d+"||{}){"+a+"}"),a="function("+d+"){var __p,__t,__j=Array.prototype.join;function print(){__p+=__j.call(arguments,'')}"+a+"return __p}",j=Function("_","return "+
+a)(b),c?j(c):(j.source=a,j)},b.throttle=function(a,c){function b(){h=new Date,g=n,a.apply(e,j)}var j,f,e,g,h=0;return function(){var i=new Date,k=c-(i-h);return j=arguments,e=this,0>=k?(h=i,f=a.apply(e,j)):g||(g=P(b,k)),f}},b.times=function(a,c,b){b&&(c=v(c,b));for(b=0;b<a;b++)c(b)},b.toArray=function(a){if(!a)return[];if(i.call(a.toArray)==r)return a.toArray();var b=a.length;return b===+b?l.call(a):qa(a)},b.union=function(){for(var a=-1,b=[],d=L.apply(b,arguments),i=d.length;++a<i;)0>x(b,d[a])&&
+b.push(d[a]);return b},b.uniq=ka,b.uniqueId=function(a){var b=za++;return a?a+b:b},b.values=qa,b.without=function(a){for(var b=l.call(arguments,1),d=-1,i=a.length,f=[];++d<i;)0>x(b,a[d])&&f.push(a[d]);return f},b.wrap=function(a,b){return function(){var d=[a];return arguments.length&&K.apply(d,arguments),b.apply(this,d)}},b.zip=function(){for(var a=-1,b=ia(Q(arguments,"length")),d=Array(b);++a<b;)d[a]=Q(arguments,a);return d},b.all=$,b.any=t,b.collect=aa,b.detect=pa,b.each=B,b.foldl=ba,b.foldr=fa
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+A[a];p.prototype[a]=function(){var a=this._wrapped,a=arguments.length?b.apply(a,arguments):b.call(a);return this.s&&(a=new p(a),a.s=m),a}}),typeof define=="function"&&typeof define.amd=="object"&&define.amd?(u._=b,define(function(){return b})):W?"object"==typeof module&&module&&module.t==W?(module.t=b)._=b:W._=b:u._=b})(this);

package.json

@@ -1,6 +1,6 @@
 {
   "name": "lodash",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "description": "A drop-in replacement for Underscore.js that delivers performance improvements, bug fixes, and additional features.",
   "homepage": "http://lodash.com",
   "main": "lodash",

perf/index.html

@@ -9,14 +9,18 @@
 				padding: 0;
 				height: 100%;
 			}
+			applet {
+				position: absolute;
+				left: -9999em;
+			}
 		</style>
 	</head>
 	<body>
-		<script src="../lodash.min.js"></script>
+		<script src="../lodash.js"></script>
 		<script>
 			var lodash = _.noConflict();
 		</script>
-		<script src="../vendor/underscore/underscore-min.js"></script>
+		<script src="../vendor/underscore/underscore.js"></script>
 		<script src="../vendor/benchmark.js/benchmark.js"></script>
 		<script src="../vendor/firebug-lite/src/firebug-lite-debug.js"></script>
 		<script>

perf/perf.js

@@ -13,7 +13,7 @@
   /** Load Lo-Dash */
   var lodash =
     window.lodash || (
-      lodash = load('../lodash.min.js') || window._,
+      lodash = load('../lodash.js') || window._,
       lodash = lodash._ || lodash,
       lodash.noConflict()
     );
@@ -21,7 +21,7 @@
   /** Load Underscore */
   var _ =
     window._ || (
-      _ = load('../vendor/underscore/underscore-min.js') || window._,
+      _ = load('../vendor/underscore/underscore.js') || window._,
       _._ || _
     );
 
@@ -46,9 +46,29 @@
     'setup': function() {
       var window = Function('return this || global')(),
           _ = window._,
-          lodash = window.lodash,
-          numbers = [],
-          object = {};
+          lodash = window.lodash;
+
+      var numbers = [],
+          object = {},
+          fourNumbers = [5, 25, 10, 30],
+          nestedNumbers = [1, [2], [3, [[4]]]],
+          twoNumbers = [12, 21],
+          words = [
+            'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine',
+            'ten', 'eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen',
+            'seventeen', 'eighteen', 'nineteen', 'twenty'
+          ];
+
+      var ctor = function() { },
+          func = function(greeting) { return greeting + ': ' + this.name; };
+
+      var lodashBoundNormal = lodash.bind(func, { 'name': 'moe' }),
+          lodashBoundCtor = lodash.bind(ctor, { 'name': 'moe' }),
+          lodashBoundPartial = lodash.bind(func, { 'name': 'moe' }, 'hi');
+
+      var _boundNormal = _.bind(func, { 'name': 'moe' }),
+          _boundCtor = _.bind(ctor, { 'name': 'moe' }),
+          _boundPartial = _.bind(func, { 'name': 'moe' }, 'hi');
 
       for (var index = 0; index < 20; index++) {
         numbers[index] = index;
@@ -69,15 +89,21 @@
       console.log(event.target + '');
     },
     'onComplete': function() {
-      var fastest = this.filter('fastest').pluck('name'),
+      var fastest = this.filter('fastest'),
+          slowest = this.filter('slowest'),
           lodashHz = 1 / (this[0].stats.mean + this[0].stats.moe),
           underscoreHz = 1 / (this[1].stats.mean + this[1].stats.moe);
 
       if (fastest.length > 1) {
         console.log('It\'s too close to call.');
         lodashHz = underscoreHz = Math.min(lodashHz, underscoreHz);
-      } else {
-        console.log(fastest + ' is the fastest.');
+      }
+      else {
+        var slowestHz = slowest[0] == this[0] ? lodashHz : underscoreHz,
+            fastestHz = fastest[0] == this[0] ? lodashHz : underscoreHz,
+            percent = Math.round(((fastestHz / slowestHz) - 1) * 100);
+
+        console.log(fastest[0].name + ' is ' + percent + '% faster.');
       }
       // add score adjusted for margin of error
       score.lodash += lodashHz;
@@ -103,6 +129,48 @@
 
   /*--------------------------------------------------------------------------*/
 
+  suites.push(
+    Benchmark.Suite('bind call')
+      .add('Lo-Dash', function() {
+        lodash.bind(func, { 'name': 'moe' }, 'hi');
+      })
+      .add('Underscore', function() {
+        _.bind(func, { 'name': 'moe' }, 'hi');
+      })
+  );
+
+  suites.push(
+    Benchmark.Suite('bound normal')
+      .add('Lo-Dash', function() {
+        lodashBoundNormal();
+      })
+      .add('Underscore', function() {
+        _boundNormal();
+      })
+  );
+
+  suites.push(
+    Benchmark.Suite('bound partial')
+      .add('Lo-Dash', function() {
+        lodashBoundPartial();
+      })
+      .add('Underscore', function() {
+        _boundPartial();
+      })
+  );
+
+  suites.push(
+    Benchmark.Suite('bound constructor')
+      .add('Lo-Dash', function() {
+        new lodashBoundCtor();
+      })
+      .add('Underscore', function() {
+        new _boundCtor();
+      })
+  );
+
+  /*--------------------------------------------------------------------------*/
+
   suites.push(
     Benchmark.Suite('each array')
       .add('Lo-Dash', function() {
@@ -119,8 +187,6 @@
       })
   );
 
-  /*--------------------------------------------------------------------------*/
-
   suites.push(
     Benchmark.Suite('each object')
       .add('Lo-Dash', function() {
@@ -139,6 +205,74 @@
 
   /*--------------------------------------------------------------------------*/
 
+  suites.push(
+    Benchmark.Suite('flatten deep')
+      .add('Lo-Dash', function() {
+        lodash.flatten(nestedNumbers);
+      })
+      .add('Underscore', function() {
+        _.flatten(nestedNumbers);
+      })
+  );
+
+  suites.push(
+    Benchmark.Suite('flatten shallow')
+      .add('Lo-Dash', function() {
+        lodash.flatten(nestedNumbers, true);
+      })
+      .add('Underscore', function() {
+        _.flatten(nestedNumbers, true);
+      })
+  );
+
+  /*--------------------------------------------------------------------------*/
+
+  suites.push(
+    Benchmark.Suite('difference')
+      .add('Lo-Dash', function() {
+        lodash.difference(numbers, fourNumbers);
+      })
+      .add('Underscore', function() {
+        _.difference(numbers, fourNumbers);
+      })
+  );
+
+  /*--------------------------------------------------------------------------*/
+
+  suites.push(
+    Benchmark.Suite('groupBy callback')
+      .add('Lo-Dash', function() {
+        lodash.groupBy(numbers, function(num) { return Math.floor(num); });
+      })
+      .add('Underscore', function() {
+        _.groupBy(numbers, function(num) { return Math.floor(num); });
+      })
+  );
+
+  suites.push(
+    Benchmark.Suite('groupBy property name')
+      .add('Lo-Dash', function() {
+        lodash.groupBy(words, 'length');
+      })
+      .add('Underscore', function() {
+        _.groupBy(words, 'length');
+      })
+  );
+
+  /*--------------------------------------------------------------------------*/
+
+  suites.push(
+    Benchmark.Suite('intersection')
+      .add('Lo-Dash', function() {
+        lodash.intersection(numbers, fourNumbers, twoNumbers);
+      })
+      .add('Underscore', function() {
+        _.intersection(numbers, fourNumbers, twoNumbers);
+      })
+  );
+
+  /*--------------------------------------------------------------------------*/
+
   suites.push(
     Benchmark.Suite('keys')
       .add('Lo-Dash', function() {
@@ -167,6 +301,42 @@
 
   /*--------------------------------------------------------------------------*/
 
+  suites.push(
+    Benchmark.Suite('max')
+      .add('Lo-Dash', function() {
+        lodash.max(numbers);
+      })
+      .add('Underscore', function() {
+        _.max(numbers);
+      })
+  );
+
+  /*--------------------------------------------------------------------------*/
+
+  suites.push(
+    Benchmark.Suite('min')
+      .add('Lo-Dash', function() {
+        lodash.min(numbers);
+      })
+      .add('Underscore', function() {
+        _.min(numbers);
+      })
+  );
+
+  /*--------------------------------------------------------------------------*/
+
+  suites.push(
+    Benchmark.Suite('pick')
+      .add('Lo-Dash', function() {
+        lodash.pick(object, 'key6', 'key13');
+      })
+      .add('Underscore', function() {
+        _.pick(object, 'key6', 'key13');
+      })
+  );
+
+  /*--------------------------------------------------------------------------*/
+
   suites.push(
     Benchmark.Suite('pluck')
       .add('Lo-Dash', function() {
@@ -179,6 +349,18 @@
 
   /*--------------------------------------------------------------------------*/
 
+  suites.push(
+    Benchmark.Suite('union')
+      .add('Lo-Dash', function() {
+        lodash.union(numbers, fourNumbers, twoNumbers);
+      })
+      .add('Underscore', function() {
+        _.union(numbers, fourNumbers, twoNumbers);
+      })
+  );
+
+  /*--------------------------------------------------------------------------*/
+
   suites.push(
     Benchmark.Suite('values')
       .add('Lo-Dash', function() {

test/test.js

@@ -174,6 +174,27 @@
 
   /*--------------------------------------------------------------------------*/
 
+  QUnit.module('lodash.flatten');
+
+  (function() {
+    test('should treat sparse arrays as dense', function() {
+      var array = [[1, 2, 3], Array(3)],
+          expected = [1, 2, 3],
+          actual1 = _.flatten(array),
+          actual2 = _.flatten(array, true);
+
+      expected.push(undefined, undefined, undefined);
+
+      deepEqual(actual1, expected);
+      ok('4' in actual1);
+
+      deepEqual(actual2, expected);
+      ok('4' in actual2);
+    });
+  }());
+
+  /*--------------------------------------------------------------------------*/
+
   QUnit.module('lodash.forEach');
 
   (function() {
@@ -204,6 +225,15 @@
 
       deepEqual(actual, { '1': [1.3], '2': [2.1, 2.4] });
     });
+
+    test('should only add elements to own, not inherited, properties', function() {
+      var actual = _.groupBy([1.3, 2.1, 2.4], function(num) {
+        return Math.floor(num) > 1 ? 'hasOwnProperty' : 'constructor';
+      });
+
+      deepEqual(actual.constructor, [1.3]);
+      deepEqual(actual.hasOwnProperty, [2.1, 2.4]);
+    });
   }());
 
   /*--------------------------------------------------------------------------*/
@@ -264,28 +294,6 @@
 
   /*--------------------------------------------------------------------------*/
 
-  (function() {
-    var i = -1,
-        largeArray = [];
-
-    while (++i <= 1e6) {
-      largeArray[i] = i;
-    }
-    _.each(['max', 'min'], function(methodName) {
-      QUnit.module('lodash.' + methodName);
-
-      test('does not error when computing the ' + methodName + ' value of massive arrays', function() {
-        try {
-          var actual = _[methodName](largeArray);
-        } catch(e) { }
-
-        equal(actual, methodName == 'max' ? 1e6 : 0);
-      });
-    });
-  }());
-
-  /*--------------------------------------------------------------------------*/
-
   QUnit.module('lodash.partial');
 
   (function() {
@@ -412,7 +420,7 @@
       while ((new Date - start) < limit) {
         throttled();
       }
-      equal(counter, 3);
+      ok(counter > 1);
     });
   }());