[js-perf-test] add microbenchmarks for Object.values(), Object.entries()

test/js-perf-test/Lodash/lodash.custom.js

Index: test/js-perf-test/Lodash/lodash.custom.js
diff --git a/test/js-perf-test/Lodash/lodash.custom.js b/test/js-perf-test/Lodash/lodash.custom.js
new file mode 100644
index 0000000000000000000000000000000000000000..dd17001f01032d058194483133789c18bc3f8846
--- /dev/null
+++ b/test/js-perf-test/Lodash/lodash.custom.js
@@ -0,0 +1,795 @@
+/**
+ * @license

[caitp (gmail), 2016/03/04 16:50:16]

The infra isn't happy about the lodash file not containing v8 copyright header
--- I'm not sure if this will cause gclient hooks to complain when cls not
touching the file are uploaded, or not. It does complain on the dependent CL, so
I worry that it might.

[Camillo Bruni, 2016/03/04 17:18:37]

For our purpose I guess it would suffice to just have microbenchmarks for
Object.assign and Object.values. 

+ * lodash 4.5.1 (Custom Build) <https://lodash.com/>
+ * Build: `lodash include="values,toPairs"`
+ * Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
+ * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
+ * Copyright 2009-2016 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+ * Available under MIT license <https://lodash.com/license>
+ */
+;(function() {
+
+  /** Used as a safe reference for `undefined` in pre-ES5 environments. */
+  var undefined;
+
+  /** Used as the semantic version number. */
+  var VERSION = '4.5.1';
+
+  /** Used as references for various `Number` constants. */
+  var MAX_SAFE_INTEGER = 9007199254740991;
+
+  /** `Object#toString` result references. */
+  var argsTag = '[object Arguments]',
+      funcTag = '[object Function]',
+      genTag = '[object GeneratorFunction]',
+      stringTag = '[object String]';
+
+  /** Used to detect unsigned integer values. */
+  var reIsUint = /^(?:0|[1-9]\d*)$/;
+
+  /** Used to determine if values are of the language type `Object`. */
+  var objectTypes = {
+    'function': true,
+    'object': true
+  };
+
+  /** Detect free variable `exports`. */
+  var freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType)
+    ? exports
+    : undefined;
+
+  /** Detect free variable `module`. */
+  var freeModule = (objectTypes[typeof module] && module && !module.nodeType)
+    ? module
+    : undefined;
+
+  /** Detect the popular CommonJS extension `module.exports`. */
+  var moduleExports = (freeModule && freeModule.exports === freeExports)
+    ? freeExports
+    : undefined;
+
+  /** Detect free variable `global` from Node.js. */
+  var freeGlobal = checkGlobal(freeExports && freeModule && typeof global == 'object' && global);
+
+  /** Detect free variable `self`. */
+  var freeSelf = checkGlobal(objectTypes[typeof self] && self);
+
+  /** Detect free variable `window`. */
+  var freeWindow = checkGlobal(objectTypes[typeof window] && window);
+
+  /** Detect `this` as the global object. */
+  var thisGlobal = checkGlobal(objectTypes[typeof this] && this);
+
+  /**
+   * Used as a reference to the global object.
+   *
+   * The `this` value is used if it's the global object to avoid Greasemonkey's
+   * restricted `window` object, otherwise the `window` object is used.
+   */
+  var root = freeGlobal ||
+    ((freeWindow !== (thisGlobal && thisGlobal.window)) && freeWindow) ||
+      freeSelf || thisGlobal || Function('return this')();
+
+  /*--------------------------------------------------------------------------*/
+
+  /**
+   * A specialized version of `_.map` for arrays without support for iteratee
+   * shorthands.
+   *
+   * @private
+   * @param {Array} array The array to iterate over.
+   * @param {Function} iteratee The function invoked per iteration.
+   * @returns {Array} Returns the new mapped array.
+   */
+  function arrayMap(array, iteratee) {
+    var index = -1,
+        length = array.length,
+        result = Array(length);
+
+    while (++index < length) {
+      result[index] = iteratee(array[index], index, array);
+    }
+    return result;
+  }
+
+  /**
+   * The base implementation of `_.times` without support for iteratee shorthands
+   * or max array length checks.
+   *
+   * @private
+   * @param {number} n The number of times to invoke `iteratee`.
+   * @param {Function} iteratee The function invoked per iteration.
+   * @returns {Array} Returns the array of results.
+   */
+  function baseTimes(n, iteratee) {
+    var index = -1,
+        result = Array(n);
+
+    while (++index < n) {
+      result[index] = iteratee(index);
+    }
+    return result;
+  }
+
+  /**
+   * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array
+   * of key-value pairs for `object` corresponding to the property names of `props`.
+   *
+   * @private
+   * @param {Object} object The object to query.
+   * @param {Array} props The property names to get values for.
+   * @returns {Object} Returns the new array of key-value pairs.
+   */
+  function baseToPairs(object, props) {
+    return arrayMap(props, function(key) {
+      return [key, object[key]];
+    });
+  }
+
+  /**
+   * The base implementation of `_.values` and `_.valuesIn` which creates an
+   * array of `object` property values corresponding to the property names
+   * of `props`.
+   *
+   * @private
+   * @param {Object} object The object to query.
+   * @param {Array} props The property names to get values for.
+   * @returns {Object} Returns the array of property values.
+   */
+  function baseValues(object, props) {
+    return arrayMap(props, function(key) {
+      return object[key];
+    });
+  }
+
+  /**
+   * Checks if `value` is a global object.
+   *
+   * @private
+   * @param {*} value The value to check.
+   * @returns {null|Object} Returns `value` if it's a global object, else `null`.
+   */
+  function checkGlobal(value) {
+    return (value && value.Object === Object) ? value : null;
+  }
+
+  /**
+   * Checks if `value` is a valid array-like index.
+   *
+   * @private
+   * @param {*} value The value to check.
+   * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
+   * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
+   */
+  function isIndex(value, length) {
+    value = (typeof value == 'number' || reIsUint.test(value)) ? +value : -1;
+    length = length == null ? MAX_SAFE_INTEGER : length;
+    return value > -1 && value % 1 == 0 && value < length;
+  }
+
+  /*--------------------------------------------------------------------------*/
+
+  /** Used for built-in method references. */
+  var objectProto = Object.prototype;
+
+  /** Used to check objects for own properties. */
+  var hasOwnProperty = objectProto.hasOwnProperty;
+
+  /**
+   * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+   * of values.
+   */
+  var objectToString = objectProto.toString;
+
+  /** Built-in value references. */
+  var Symbol = root.Symbol,
+      getPrototypeOf = Object.getPrototypeOf,
+      propertyIsEnumerable = objectProto.propertyIsEnumerable;
+
+  /* Built-in method references for those with the same name as other `lodash` methods. */
+  var nativeKeys = Object.keys;
+
+  /** Used to lookup unminified function names. */
+  var realNames = {};
+
+  /*------------------------------------------------------------------------*/
+
+  /**
+   * Creates a `lodash` object which wraps `value` to enable implicit method
+   * chaining. Methods that operate on and return arrays, collections, and
+   * functions can be chained together. Methods that retrieve a single value or
+   * may return a primitive value will automatically end the chain sequence and
+   * return the unwrapped value. Otherwise, the value must be unwrapped with
+   * `_#value`.
+   *
+   * Explicit chaining, which must be unwrapped with `_#value` in all cases,
+   * may be enabled using `_.chain`.
+   *
+   * The execution of chained methods is lazy, that is, it's deferred until
+   * `_#value` is implicitly or explicitly called.
+   *
+   * Lazy evaluation allows several methods to support shortcut fusion. Shortcut
+   * fusion is an optimization to merge iteratee calls; this avoids the creation
+   * of intermediate arrays and can greatly reduce the number of iteratee executions.
+   * Sections of a chain sequence qualify for shortcut fusion if the section is
+   * applied to an array of at least two hundred elements and any iteratees
+   * accept only one argument. The heuristic for whether a section qualifies
+   * for shortcut fusion is subject to change.
+   *
+   * Chaining is supported in custom builds as long as the `_#value` method is
+   * directly or indirectly included in the build.
+   *
+   * In addition to lodash methods, wrappers have `Array` and `String` methods.
+   *
+   * The wrapper `Array` methods are:
+   * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
+   *
+   * The wrapper `String` methods are:
+   * `replace` and `split`
+   *
+   * The wrapper methods that support shortcut fusion are:
+   * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
+   * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
+   * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
+   *
+   * The chainable wrapper methods are:
+   * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
+   * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
+   * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
+   * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`, `difference`,
+   * `differenceBy`, `differenceWith`, `drop`, `dropRight`, `dropRightWhile`,
+   * `dropWhile`, `fill`, `filter`, `flatten`, `flattenDeep`, `flattenDepth`,
+   * `flip`, `flow`, `flowRight`, `fromPairs`, `functions`, `functionsIn`,
+   * `groupBy`, `initial`, `intersection`, `intersectionBy`, `intersectionWith`,
+   * `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`, `keys`, `keysIn`,
+   * `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`, `memoize`,
+   * `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`, `nthArg`,
+   * `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`, `overEvery`,
+   * `overSome`, `partial`, `partialRight`, `partition`, `pick`, `pickBy`, `plant`,
+   * `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`, `pullAt`, `push`,
+   * `range`, `rangeRight`, `rearg`, `reject`, `remove`, `rest`, `reverse`,
+   * `sampleSize`, `set`, `setWith`, `shuffle`, `slice`, `sort`, `sortBy`,
+   * `splice`, `spread`, `tail`, `take`, `takeRight`, `takeRightWhile`,
+   * `takeWhile`, `tap`, `throttle`, `thru`, `toArray`, `toPairs`, `toPairsIn`,
+   * `toPath`, `toPlainObject`, `transform`, `unary`, `union`, `unionBy`,
+   * `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`, `unshift`, `unzip`,
+   * `unzipWith`, `values`, `valuesIn`, `without`, `wrap`, `xor`, `xorBy`,
+   * `xorWith`, `zip`, `zipObject`, `zipObjectDeep`, and `zipWith`
+   *
+   * The wrapper methods that are **not** chainable by default are:
+   * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
+   * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `deburr`, `endsWith`, `eq`,
+   * `escape`, `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
+   * `findLastIndex`, `findLastKey`, `floor`, `forEach`, `forEachRight`, `forIn`,
+   * `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`, `hasIn`,
+   * `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`, `isArguments`,
+   * `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`, `isBoolean`,
+   * `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`, `isEqualWith`,
+   * `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`, `isMap`,
+   * `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`, `isNumber`,
+   * `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`, `isSafeInteger`,
+   * `isSet`, `isString`, `isUndefined`, `isTypedArray`, `isWeakMap`, `isWeakSet`,
+   * `join`, `kebabCase`, `last`, `lastIndexOf`, `lowerCase`, `lowerFirst`,
+   * `lt`, `lte`, `max`, `maxBy`, `mean`, `min`, `minBy`, `noConflict`, `noop`,
+   * `now`, `pad`, `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`,
+   * `reduceRight`, `repeat`, `result`, `round`, `runInContext`, `sample`,
+   * `shift`, `size`, `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`,
+   * `sortedLastIndex`, `sortedLastIndexBy`, `startCase`, `startsWith`, `subtract`,
+   * `sum`, `sumBy`, `template`, `times`, `toLower`, `toInteger`, `toLength`,
+   * `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`, `trimEnd`,
+   * `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`, `upperFirst`,
+   * `value`, and `words`
+   *
+   * @name _
+   * @constructor
+   * @category Seq
+   * @param {*} value The value to wrap in a `lodash` instance.
+   * @returns {Object} Returns the new `lodash` wrapper instance.
+   * @example
+   *
+   * function square(n) {
+   *   return n * n;
+   * }
+   *
+   * var wrapped = _([1, 2, 3]);
+   *
+   * // Returns an unwrapped value.
+   * wrapped.reduce(_.add);
+   * // => 6
+   *
+   * // Returns a wrapped value.
+   * var squares = wrapped.map(square);
+   *
+   * _.isArray(squares);
+   * // => false
+   *
+   * _.isArray(squares.value());
+   * // => true
+   */
+  function lodash() {
+    // No operation performed.
+  }
+
+  /*------------------------------------------------------------------------*/
+
+  /**
+   * The base implementation of `_.has` without support for deep paths.
+   *
+   * @private
+   * @param {Object} object The object to query.
+   * @param {Array|string} key The key to check.
+   * @returns {boolean} Returns `true` if `key` exists, else `false`.
+   */
+  function baseHas(object, key) {
+    // Avoid a bug in IE 10-11 where objects with a [[Prototype]] of `null`,
+    // that are composed entirely of index properties, return `false` for
+    // `hasOwnProperty` checks of them.
+    return hasOwnProperty.call(object, key) ||
+      (typeof object == 'object' && key in object && getPrototypeOf(object) === null);
+  }
+
+  /**
+   * The base implementation of `_.keys` which doesn't skip the constructor
+   * property of prototypes or treat sparse arrays as dense.
+   *
+   * @private
+   * @param {Object} object The object to query.
+   * @returns {Array} Returns the array of property names.
+   */
+  function baseKeys(object) {
+    return nativeKeys(Object(object));
+  }
+
+  /**
+   * The base implementation of `_.property` without support for deep paths.
+   *
+   * @private
+   * @param {string} key The key of the property to get.
+   * @returns {Function} Returns the new function.
+   */
+  function baseProperty(key) {
+    return function(object) {
+      return object == null ? undefined : object[key];
+    };
+  }
+
+  /**
+   * Gets the "length" property value of `object`.
+   *
+   * **Note:** This function is used to avoid a [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792)
+   * that affects Safari on at least iOS 8.1-8.3 ARM64.
+   *
+   * @private
+   * @param {Object} object The object to query.
+   * @returns {*} Returns the "length" value.
+   */
+  var getLength = baseProperty('length');
+
+  /**
+   * Creates an array of index keys for `object` values of arrays,
+   * `arguments` objects, and strings, otherwise `null` is returned.
+   *
+   * @private
+   * @param {Object} object The object to query.
+   * @returns {Array|null} Returns index keys, else `null`.
+   */
+  function indexKeys(object) {
+    var length = object ? object.length : undefined;
+    if (isLength(length) &&
+        (isArray(object) || isString(object) || isArguments(object))) {
+      return baseTimes(length, String);
+    }
+    return null;
+  }
+
+  /**
+   * Checks if `value` is likely a prototype object.
+   *
+   * @private
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
+   */
+  function isPrototype(value) {
+    var Ctor = value && value.constructor,
+        proto = (isFunction(Ctor) && Ctor.prototype) || objectProto;
+
+    return value === proto;
+  }
+
+  /*------------------------------------------------------------------------*/
+
+  /**
+   * Checks if `value` is likely an `arguments` object.
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+   * @example
+   *
+   * _.isArguments(function() { return arguments; }());
+   * // => true
+   *
+   * _.isArguments([1, 2, 3]);
+   * // => false
+   */
+  function isArguments(value) {
+    // Safari 8.1 incorrectly makes `arguments.callee` enumerable in strict mode.
+    return isArrayLikeObject(value) && hasOwnProperty.call(value, 'callee') &&
+      (!propertyIsEnumerable.call(value, 'callee') || objectToString.call(value) == argsTag);
+  }
+
+  /**
+   * Checks if `value` is classified as an `Array` object.
+   *
+   * @static
+   * @memberOf _
+   * @type {Function}
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+   * @example
+   *
+   * _.isArray([1, 2, 3]);
+   * // => true
+   *
+   * _.isArray(document.body.children);
+   * // => false
+   *
+   * _.isArray('abc');
+   * // => false
+   *
+   * _.isArray(_.noop);
+   * // => false
+   */
+  var isArray = Array.isArray;
+
+  /**
+   * Checks if `value` is array-like. A value is considered array-like if it's
+   * not a function and has a `value.length` that's an integer greater than or
+   * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
+   * @example
+   *
+   * _.isArrayLike([1, 2, 3]);
+   * // => true
+   *
+   * _.isArrayLike(document.body.children);
+   * // => true
+   *
+   * _.isArrayLike('abc');
+   * // => true
+   *
+   * _.isArrayLike(_.noop);
+   * // => false
+   */
+  function isArrayLike(value) {
+    return value != null &&
+      !(typeof value == 'function' && isFunction(value)) && isLength(getLength(value));
+  }
+
+  /**
+   * This method is like `_.isArrayLike` except that it also checks if `value`
+   * is an object.
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is an array-like object, else `false`.
+   * @example
+   *
+   * _.isArrayLikeObject([1, 2, 3]);
+   * // => true
+   *
+   * _.isArrayLikeObject(document.body.children);
+   * // => true
+   *
+   * _.isArrayLikeObject('abc');
+   * // => false
+   *
+   * _.isArrayLikeObject(_.noop);
+   * // => false
+   */
+  function isArrayLikeObject(value) {
+    return isObjectLike(value) && isArrayLike(value);
+  }
+
+  /**
+   * Checks if `value` is classified as a `Function` object.
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+   * @example
+   *
+   * _.isFunction(_);
+   * // => true
+   *
+   * _.isFunction(/abc/);
+   * // => false
+   */
+  function isFunction(value) {
+    // The use of `Object#toString` avoids issues with the `typeof` operator
+    // in Safari 8 which returns 'object' for typed array constructors, and
+    // PhantomJS 1.9 which returns 'function' for `NodeList` instances.
+    var tag = isObject(value) ? objectToString.call(value) : '';
+    return tag == funcTag || tag == genTag;
+  }
+
+  /**
+   * Checks if `value` is a valid array-like length.
+   *
+   * **Note:** This function is loosely based on [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
+   * @example
+   *
+   * _.isLength(3);
+   * // => true
+   *
+   * _.isLength(Number.MIN_VALUE);
+   * // => false
+   *
+   * _.isLength(Infinity);
+   * // => false
+   *
+   * _.isLength('3');
+   * // => false
+   */
+  function isLength(value) {
+    return typeof value == 'number' &&
+      value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
+  }
+
+  /**
+   * Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
+   * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is an object, else `false`.
+   * @example
+   *
+   * _.isObject({});
+   * // => true
+   *
+   * _.isObject([1, 2, 3]);
+   * // => true
+   *
+   * _.isObject(_.noop);
+   * // => true
+   *
+   * _.isObject(null);
+   * // => false
+   */
+  function isObject(value) {
+    var type = typeof value;
+    return !!value && (type == 'object' || type == 'function');
+  }
+
+  /**
+   * Checks if `value` is object-like. A value is object-like if it's not `null`
+   * and has a `typeof` result of "object".
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
+   * @example
+   *
+   * _.isObjectLike({});
+   * // => true
+   *
+   * _.isObjectLike([1, 2, 3]);
+   * // => true
+   *
+   * _.isObjectLike(_.noop);
+   * // => false
+   *
+   * _.isObjectLike(null);
+   * // => false
+   */
+  function isObjectLike(value) {
+    return !!value && typeof value == 'object';
+  }
+
+  /**
+   * Checks if `value` is classified as a `String` primitive or object.
+   *
+   * @static
+   * @memberOf _
+   * @category Lang
+   * @param {*} value The value to check.
+   * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+   * @example
+   *
+   * _.isString('abc');
+   * // => true
+   *
+   * _.isString(1);
+   * // => false
+   */
+  function isString(value) {
+    return typeof value == 'string' ||
+      (!isArray(value) && isObjectLike(value) && objectToString.call(value) == stringTag);
+  }
+
+  /*------------------------------------------------------------------------*/
+
+  /**
+   * Creates an array of the own enumerable property names of `object`.
+   *
+   * **Note:** Non-object values are coerced to objects. See the
+   * [ES spec](http://ecma-international.org/ecma-262/6.0/#sec-object.keys)
+   * for more details.
+   *
+   * @static
+   * @memberOf _
+   * @category Object
+   * @param {Object} object The object to query.
+   * @returns {Array} Returns the array of property names.
+   * @example
+   *
+   * function Foo() {
+   *   this.a = 1;
+   *   this.b = 2;
+   * }
+   *
+   * Foo.prototype.c = 3;
+   *
+   * _.keys(new Foo);
+   * // => ['a', 'b'] (iteration order is not guaranteed)
+   *
+   * _.keys('hi');
+   * // => ['0', '1']
+   */
+  function keys(object) {
+    var isProto = isPrototype(object);
+    if (!(isProto || isArrayLike(object))) {
+      return baseKeys(object);
+    }
+    var indexes = indexKeys(object),
+        skipIndexes = !!indexes,
+        result = indexes || [],
+        length = result.length;
+
+    for (var key in object) {
+      if (baseHas(object, key) &&
+          !(skipIndexes && (key == 'length' || isIndex(key, length))) &&
+          !(isProto && key == 'constructor')) {
+        result.push(key);
+      }
+    }
+    return result;
+  }
+
+  /**
+   * Creates an array of own enumerable key-value pairs for `object` which
+   * can be consumed by `_.fromPairs`.
+   *
+   * @static
+   * @memberOf _
+   * @category Object
+   * @param {Object} object The object to query.
+   * @returns {Array} Returns the new array of key-value pairs.
+   * @example
+   *
+   * function Foo() {
+   *   this.a = 1;
+   *   this.b = 2;
+   * }
+   *
+   * Foo.prototype.c = 3;
+   *
+   * _.toPairs(new Foo);
+   * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)
+   */
+  function toPairs(object) {
+    return baseToPairs(object, keys(object));
+  }
+
+  /**
+   * Creates an array of the own enumerable property values of `object`.
+   *
+   * **Note:** Non-object values are coerced to objects.
+   *
+   * @static
+   * @memberOf _
+   * @category Object
+   * @param {Object} object The object to query.
+   * @returns {Array} Returns the array of property values.
+   * @example
+   *
+   * function Foo() {
+   *   this.a = 1;
+   *   this.b = 2;
+   * }
+   *
+   * Foo.prototype.c = 3;
+   *
+   * _.values(new Foo);
+   * // => [1, 2] (iteration order is not guaranteed)
+   *
+   * _.values('hi');
+   * // => ['h', 'i']
+   */
+  function values(object) {
+    return object ? baseValues(object, keys(object)) : [];
+  }
+
+  /*------------------------------------------------------------------------*/
+
+  // Add functions that return wrapped values when chaining.
+  lodash.keys = keys;
+  lodash.toPairs = toPairs;
+  lodash.values = values;
+
+  /*------------------------------------------------------------------------*/
+
+  // Add functions that return unwrapped values when chaining.
+  lodash.isArguments = isArguments;
+  lodash.isArray = isArray;
+  lodash.isArrayLike = isArrayLike;
+  lodash.isArrayLikeObject = isArrayLikeObject;
+  lodash.isFunction = isFunction;
+  lodash.isLength = isLength;
+  lodash.isObject = isObject;
+  lodash.isObjectLike = isObjectLike;
+  lodash.isString = isString;
+
+  /*------------------------------------------------------------------------*/
+
+  /**
+   * The semantic version number.
+   *
+   * @static
+   * @memberOf _
+   * @type {string}
+   */
+  lodash.VERSION = VERSION;
+
+  /*--------------------------------------------------------------------------*/
+
+  // Expose lodash on the free variable `window` or `self` when available. This
+  // prevents errors in cases where lodash is loaded by a script tag in the presence
+  // of an AMD loader. See http://requirejs.org/docs/errors.html#mismatch for more details.
+  (freeWindow || freeSelf || {})._ = lodash;
+
+  // Some AMD build optimizers like r.js check for 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;
+    });
+  }
+  // Check for `exports` after `define` in case a build optimizer adds an `exports` object.
+  else if (freeExports && freeModule) {
+    // Export for Node.js.
+    if (moduleExports) {
+      (freeModule.exports = lodash)._ = lodash;
+    }
+    // Export for CommonJS support.
+    freeExports._ = lodash;
+  }
+  else {
+    // Export to the global object.
+    root._ = lodash;
+  }
+}.call(this));