underscore-1.3.1.js
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underscore-1.3.1.js
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			// Underscore.js 1.3.1
			// (c) 2009-2012 Jeremy Ashkenas, DocumentCloud Inc.
			// Underscore is freely distributable under the MIT license.
			// Portions of Underscore are inspired or borrowed from Prototype,
			// Oliver Steele's Functional, and John Resig's Micro-Templating.
			// For all details and documentation:
			// http://documentcloud.github.com/underscore

			(function() {

			// Baseline setup
			// --------------

			// Establish the root object, `window` in the browser, or `global` on the server.
			var root = this;

			// Save the previous value of the `_` variable.
			var previousUnderscore = root._;

			// Establish the object that gets returned to break out of a loop iteration.
			var breaker = {};

			// Save bytes in the minified (but not gzipped) version:
			var ArrayProto = Array.prototype, ObjProto = Object.prototype, FuncProto = Function.prototype;

			// Create quick reference variables for speed access to core prototypes.
			var slice = ArrayProto.slice,
			unshift = ArrayProto.unshift,
			toString = ObjProto.toString,
			hasOwnProperty = ObjProto.hasOwnProperty;

			// All ECMAScript 5 native function implementations that we hope to use
			// are declared here.
			var
			nativeForEach = ArrayProto.forEach,
			nativeMap = ArrayProto.map,
			nativeReduce = ArrayProto.reduce,
			nativeReduceRight = ArrayProto.reduceRight,
			nativeFilter = ArrayProto.filter,
			nativeEvery = ArrayProto.every,
			nativeSome = ArrayProto.some,
			nativeIndexOf = ArrayProto.indexOf,
			nativeLastIndexOf = ArrayProto.lastIndexOf,
			nativeIsArray = Array.isArray,
			nativeKeys = Object.keys,
			nativeBind = FuncProto.bind;

			// Create a safe reference to the Underscore object for use below.
			var _ = function(obj) { return new wrapper(obj); };

			// Export the Underscore object for Node.js, with
			// backwards-compatibility for the old `require()` API. If we're in
			// the browser, add `_` as a global object via a string identifier,
			// for Closure Compiler "advanced" mode.
			if (typeof exports !== 'undefined') {
			if (typeof module !== 'undefined' && module.exports) {
			exports = module.exports = _;
			}
			exports._ = _;
			} else {
			root['_'] = _;
			}

			// Current version.
			_.VERSION = '1.3.1';

			// Collection Functions
			// --------------------

			// The cornerstone, an `each` implementation, aka `forEach`.
			// Handles objects with the built-in `forEach`, arrays, and raw objects.
			// Delegates to ECMAScript 5's native `forEach` if available.
			var each = _.each = _.forEach = function(obj, iterator, context) {
			if (obj == null) return;
			if (nativeForEach && obj.forEach === nativeForEach) {
			obj.forEach(iterator, context);
			} else if (obj.length === +obj.length) {
			for (var i = 0, l = obj.length; i < l; i++) {
			if (i in obj && iterator.call(context, obj[i], i, obj) === breaker) return;
			}
			} else {
			for (var key in obj) {
			if (_.has(obj, key)) {
			if (iterator.call(context, obj[key], key, obj) === breaker) return;
			}
			}
			}
			};

			// Return the results of applying the iterator to each element.
			// Delegates to ECMAScript 5's native `map` if available.
			_.map = _.collect = function(obj, iterator, context) {
			var results = [];
			if (obj == null) return results;
			if (nativeMap && obj.map === nativeMap) return obj.map(iterator, context);
			each(obj, function(value, index, list) {
			results[results.length] = iterator.call(context, value, index, list);
			});
			if (obj.length === +obj.length) results.length = obj.length;
			return results;
			};

			// Reduce builds up a single result from a list of values, aka `inject`,
			// or `foldl`. Delegates to ECMAScript 5's native `reduce` if available.
			_.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) {
			var initial = arguments.length > 2;
			if (obj == null) obj = [];
			if (nativeReduce && obj.reduce === nativeReduce) {
			if (context) iterator = _.bind(iterator, context);
			return initial ? obj.reduce(iterator, memo) : obj.reduce(iterator);
			}
			each(obj, function(value, index, list) {
			if (!initial) {
			memo = value;
			initial = true;
			} else {
			memo = iterator.call(context, memo, value, index, list);
			}
			});
			if (!initial) throw new TypeError('Reduce of empty array with no initial value');
			return memo;
			};

			// The right-associative version of reduce, also known as `foldr`.
			// Delegates to ECMAScript 5's native `reduceRight` if available.
			_.reduceRight = _.foldr = function(obj, iterator, memo, context) {
			var initial = arguments.length > 2;
			if (obj == null) obj = [];
			if (nativeReduceRight && obj.reduceRight === nativeReduceRight) {
			if (context) iterator = _.bind(iterator, context);
			return initial ? obj.reduceRight(iterator, memo) : obj.reduceRight(iterator);
			}
			var reversed = _.toArray(obj).reverse();
			if (context && !initial) iterator = _.bind(iterator, context);
			return initial ? _.reduce(reversed, iterator, memo, context) : _.reduce(reversed, iterator);
			};

			// Return the first value which passes a truth test. Aliased as `detect`.
			_.find = _.detect = function(obj, iterator, context) {
			var result;
			any(obj, function(value, index, list) {
			if (iterator.call(context, value, index, list)) {
			result = value;
			return true;
			}
			});
			return result;
			};

			// Return all the elements that pass a truth test.
			// Delegates to ECMAScript 5's native `filter` if available.
			// Aliased as `select`.
			_.filter = _.select = function(obj, iterator, context) {
			var results = [];
			if (obj == null) return results;
			if (nativeFilter && obj.filter === nativeFilter) return obj.filter(iterator, context);
			each(obj, function(value, index, list) {
			if (iterator.call(context, value, index, list)) results[results.length] = value;
			});
			return results;
			};

			// Return all the elements for which a truth test fails.
			_.reject = function(obj, iterator, context) {
			var results = [];
			if (obj == null) return results;
			each(obj, function(value, index, list) {
			if (!iterator.call(context, value, index, list)) results[results.length] = value;
			});
			return results;
			};

			// Determine whether all of the elements match a truth test.
			// Delegates to ECMAScript 5's native `every` if available.
			// Aliased as `all`.
			_.every = _.all = function(obj, iterator, context) {
			var result = true;
			if (obj == null) return result;
			if (nativeEvery && obj.every === nativeEvery) return obj.every(iterator, context);
			each(obj, function(value, index, list) {
			if (!(result = result && iterator.call(context, value, index, list))) return breaker;
			});
			return result;
			};

			// Determine if at least one element in the object matches a truth test.
			// Delegates to ECMAScript 5's native `some` if available.
			// Aliased as `any`.
			var any = _.some = _.any = function(obj, iterator, context) {
			iterator \|\| (iterator = _.identity);
			var result = false;
			if (obj == null) return result;
			if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context);
			each(obj, function(value, index, list) {
			if (result \|\| (result = iterator.call(context, value, index, list))) return breaker;
			});
			return !!result;
			};

			// Determine if a given value is included in the array or object using `===`.
			// Aliased as `contains`.
			_.include = _.contains = function(obj, target) {
			var found = false;
			if (obj == null) return found;
			if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1;
			found = any(obj, function(value) {
			return value === target;
			});
			return found;
			};

			// Invoke a method (with arguments) on every item in a collection.
			_.invoke = function(obj, method) {
			var args = slice.call(arguments, 2);
			return _.map(obj, function(value) {
			return (_.isFunction(method) ? method \|\| value : value[method]).apply(value, args);
			});
			};

			// Convenience version of a common use case of `map`: fetching a property.
			_.pluck = function(obj, key) {
			return _.map(obj, function(value){ return value[key]; });
			};

			// Return the maximum element or (element-based computation).
			_.max = function(obj, iterator, context) {
			if (!iterator && _.isArray(obj)) return Math.max.apply(Math, obj);
			if (!iterator && _.isEmpty(obj)) return -Infinity;
			var result = {computed : -Infinity};
			each(obj, function(value, index, list) {
			var computed = iterator ? iterator.call(context, value, index, list) : value;
			computed >= result.computed && (result = {value : value, computed : computed});
			});
			return result.value;
			};

			// Return the minimum element (or element-based computation).
			_.min = function(obj, iterator, context) {
			if (!iterator && _.isArray(obj)) return Math.min.apply(Math, obj);
			if (!iterator && _.isEmpty(obj)) return Infinity;
			var result = {computed : Infinity};
			each(obj, function(value, index, list) {
			var computed = iterator ? iterator.call(context, value, index, list) : value;
			computed < result.computed && (result = {value : value, computed : computed});
			});
			return result.value;
			};

			// Shuffle an array.
			_.shuffle = function(obj) {
			var shuffled = [], rand;
			each(obj, function(value, index, list) {
			if (index == 0) {
			shuffled[0] = value;
			} else {
			rand = Math.floor(Math.random() * (index + 1));
			shuffled[index] = shuffled[rand];
			shuffled[rand] = value;
			}
			});
			return shuffled;
			};

			// Sort the object's values by a criterion produced by an iterator.
			_.sortBy = function(obj, iterator, context) {
			return _.pluck(_.map(obj, function(value, index, list) {
			return {
			value : value,
			criteria : iterator.call(context, value, index, list)
			};
			}).sort(function(left, right) {
			var a = left.criteria, b = right.criteria;
			return a < b ? -1 : a > b ? 1 : 0;
			}), 'value');
			};

			// Groups the object's values by a criterion. Pass either a string attribute
			// to group by, or a function that returns the criterion.
			_.groupBy = function(obj, val) {
			var result = {};
			var iterator = _.isFunction(val) ? val : function(obj) { return obj[val]; };
			each(obj, function(value, index) {
			var key = iterator(value, index);
			(result[key] \|\| (result[key] = [])).push(value);
			});
			return result;
			};

			// Use a comparator function to figure out at what index an object should
			// be inserted so as to maintain order. Uses binary search.
			_.sortedIndex = function(array, obj, iterator) {
			iterator \|\| (iterator = _.identity);
			var low = 0, high = array.length;
			while (low < high) {
			var mid = (low + high) >> 1;
			iterator(array[mid]) < iterator(obj) ? low = mid + 1 : high = mid;
			}
			return low;
			};

			// Safely convert anything iterable into a real, live array.
			_.toArray = function(iterable) {
			if (!iterable) return [];
			if (iterable.toArray) return iterable.toArray();
			if (_.isArray(iterable)) return slice.call(iterable);
			if (_.isArguments(iterable)) return slice.call(iterable);
			return _.values(iterable);
			};

			// Return the number of elements in an object.
			_.size = function(obj) {
			return _.toArray(obj).length;
			};

			// Array Functions
			// ---------------

			// Get the first element of an array. Passing n will return the first N
			// values in the array. Aliased as `head`. The guard check allows it to work
			// with `_.map`.
			_.first = _.head = function(array, n, guard) {
			return (n != null) && !guard ? slice.call(array, 0, n) : array[0];
			};

			// Returns everything but the last entry of the array. Especcialy useful on
			// the arguments object. Passing n will return all the values in
			// the array, excluding the last N. The guard check allows it to work with
			// `_.map`.
			_.initial = function(array, n, guard) {
			return slice.call(array, 0, array.length - ((n == null) \|\| guard ? 1 : n));
			};

			// Get the last element of an array. Passing n will return the last N
			// values in the array. The guard check allows it to work with `_.map`.
			_.last = function(array, n, guard) {
			if ((n != null) && !guard) {
			return slice.call(array, Math.max(array.length - n, 0));
			} else {
			return array[array.length - 1];
			}
			};

			// Returns everything but the first entry of the array. Aliased as `tail`.
			// Especially useful on the arguments object. Passing an index will return
			// the rest of the values in the array from that index onward. The guard
			// check allows it to work with `_.map`.
			_.rest = _.tail = function(array, index, guard) {
			return slice.call(array, (index == null) \|\| guard ? 1 : index);
			};

			// Trim out all falsy values from an array.
			_.compact = function(array) {
			return _.filter(array, function(value){ return !!value; });
			};

			// Return a completely flattened version of an array.
			_.flatten = function(array, shallow) {
			return _.reduce(array, function(memo, value) {
			if (_.isArray(value)) return memo.concat(shallow ? value : _.flatten(value));
			memo[memo.length] = value;
			return memo;
			}, []);
			};

			// Return a version of the array that does not contain the specified value(s).
			_.without = function(array) {
			return _.difference(array, slice.call(arguments, 1));
			};

			// Produce a duplicate-free version of the array. If the array has already
			// been sorted, you have the option of using a faster algorithm.
			// Aliased as `unique`.
			_.uniq = _.unique = function(array, isSorted, iterator) {
			var initial = iterator ? _.map(array, iterator) : array;
			var result = [];
			_.reduce(initial, function(memo, el, i) {
			if (0 == i \|\| (isSorted === true ? _.last(memo) != el : !_.include(memo, el))) {
			memo[memo.length] = el;
			result[result.length] = array[i];
			}
			return memo;
			}, []);
			return result;
			};

			// Produce an array that contains the union: each distinct element from all of
			// the passed-in arrays.
			_.union = function() {
			return _.uniq(_.flatten(arguments, true));
			};

			// Produce an array that contains every item shared between all the
			// passed-in arrays. (Aliased as "intersect" for back-compat.)
			_.intersection = _.intersect = function(array) {
			var rest = slice.call(arguments, 1);
			return _.filter(_.uniq(array), function(item) {
			return _.every(rest, function(other) {
			return _.indexOf(other, item) >= 0;
			});
			});
			};

			// Take the difference between one array and a number of other arrays.
			// Only the elements present in just the first array will remain.
			_.difference = function(array) {
			var rest = _.flatten(slice.call(arguments, 1));
			return _.filter(array, function(value){ return !_.include(rest, value); });
			};

			// Zip together multiple lists into a single array -- elements that share
			// an index go together.
			_.zip = function() {
			var args = slice.call(arguments);
			var length = _.max(_.pluck(args, 'length'));
			var results = new Array(length);
			for (var i = 0; i < length; i++) results[i] = _.pluck(args, "" + i);
			return results;
			};

			// If the browser doesn't supply us with indexOf (I'm looking at you, MSIE),
			// we need this function. Return the position of the first occurrence of an
			// item in an array, or -1 if the item is not included in the array.
			// Delegates to ECMAScript 5's native `indexOf` if available.
			// If the array is large and already in sort order, pass `true`
			// for isSorted to use binary search.
			_.indexOf = function(array, item, isSorted) {
			if (array == null) return -1;
			var i, l;
			if (isSorted) {
			i = _.sortedIndex(array, item);
			return array[i] === item ? i : -1;
			}
			if (nativeIndexOf && array.indexOf === nativeIndexOf) return array.indexOf(item);
			for (i = 0, l = array.length; i < l; i++) if (i in array && array[i] === item) return i;
			return -1;
			};

			// Delegates to ECMAScript 5's native `lastIndexOf` if available.
			_.lastIndexOf = function(array, item) {
			if (array == null) return -1;
			if (nativeLastIndexOf && array.lastIndexOf === nativeLastIndexOf) return array.lastIndexOf(item);
			var i = array.length;
			while (i--) if (i in array && array[i] === item) return i;
			return -1;
			};

			// Generate an integer Array containing an arithmetic progression. A port of
			// the native Python `range()` function. See
			// [the Python documentation](http://docs.python.org/library/functions.html#range).
			_.range = function(start, stop, step) {
			if (arguments.length <= 1) {
			stop = start \|\| 0;
			start = 0;
			}
			step = arguments[2] \|\| 1;

			var len = Math.max(Math.ceil((stop - start) / step), 0);
			var idx = 0;
			var range = new Array(len);

			while(idx < len) {
			range[idx++] = start;
			start += step;
			}

			return range;
			};

			// Function (ahem) Functions
			// ------------------

			// Reusable constructor function for prototype setting.
			var ctor = function(){};

			// Create a function bound to a given object (assigning `this`, and arguments,
			// optionally). Binding with arguments is also known as `curry`.
			// Delegates to ECMAScript 5's native `Function.bind` if available.
			// We check for `func.bind` first, to fail fast when `func` is undefined.
			_.bind = function bind(func, context) {
			var bound, args;
			if (func.bind === nativeBind && nativeBind) return nativeBind.apply(func, slice.call(arguments, 1));
			if (!_.isFunction(func)) throw new TypeError;
			args = slice.call(arguments, 2);
			return bound = function() {
			if (!(this instanceof bound)) return func.apply(context, args.concat(slice.call(arguments)));
			ctor.prototype = func.prototype;
			var self = new ctor;
			var result = func.apply(self, args.concat(slice.call(arguments)));
			if (Object(result) === result) return result;
			return self;
			};
			};

			// Bind all of an object's methods to that object. Useful for ensuring that
			// all callbacks defined on an object belong to it.
			_.bindAll = function(obj) {
			var funcs = slice.call(arguments, 1);
			if (funcs.length == 0) funcs = _.functions(obj);
			each(funcs, function(f) { obj[f] = _.bind(obj[f], obj); });
			return obj;
			};

			// Memoize an expensive function by storing its results.
			_.memoize = function(func, hasher) {
			var memo = {};
			hasher \|\| (hasher = _.identity);
			return function() {
			var key = hasher.apply(this, arguments);
			return _.has(memo, key) ? memo[key] : (memo[key] = func.apply(this, arguments));
			};
			};

			// Delays a function for the given number of milliseconds, and then calls
			// it with the arguments supplied.
			_.delay = function(func, wait) {
			var args = slice.call(arguments, 2);
			return setTimeout(function(){ return func.apply(func, args); }, wait);
			};

			// Defers a function, scheduling it to run after the current call stack has
			// cleared.
			_.defer = function(func) {
			return _.delay.apply(_, [func, 1].concat(slice.call(arguments, 1)));
			};

			// Returns a function, that, when invoked, will only be triggered at most once
			// during a given window of time.
			_.throttle = function(func, wait) {
			var context, args, timeout, throttling, more;
			var whenDone = _.debounce(function(){ more = throttling = false; }, wait);
			return function() {
			context = this; args = arguments;
			var later = function() {
			timeout = null;
			if (more) func.apply(context, args);
			whenDone();
			};
			if (!timeout) timeout = setTimeout(later, wait);
			if (throttling) {
			more = true;
			} else {
			func.apply(context, args);
			}
			whenDone();
			throttling = true;
			};
			};

			// Returns a function, that, as long as it continues to be invoked, will not
			// be triggered. The function will be called after it stops being called for
			// N milliseconds.
			_.debounce = function(func, wait) {
			var timeout;
			return function() {
			var context = this, args = arguments;
			var later = function() {
			timeout = null;
			func.apply(context, args);
			};
			clearTimeout(timeout);
			timeout = setTimeout(later, wait);
			};
			};

			// Returns a function that will be executed at most one time, no matter how
			// often you call it. Useful for lazy initialization.
			_.once = function(func) {
			var ran = false, memo;
			return function() {
			if (ran) return memo;
			ran = true;
			return memo = func.apply(this, arguments);
			};
			};

			// Returns the first function passed as an argument to the second,
			// allowing you to adjust arguments, run code before and after, and
			// conditionally execute the original function.
			_.wrap = function(func, wrapper) {
			return function() {
			var args = [func].concat(slice.call(arguments, 0));
			return wrapper.apply(this, args);
			};
			};

			// Returns a function that is the composition of a list of functions, each
			// consuming the return value of the function that follows.
			_.compose = function() {
			var funcs = arguments;
			return function() {
			var args = arguments;
			for (var i = funcs.length - 1; i >= 0; i--) {
			args = [funcs[i].apply(this, args)];
			}
			return args[0];
			};
			};

			// Returns a function that will only be executed after being called N times.
			_.after = function(times, func) {
			if (times <= 0) return func();
			return function() {
			if (--times < 1) { return func.apply(this, arguments); }
			};
			};

			// Object Functions
			// ----------------

			// Retrieve the names of an object's properties.
			// Delegates to ECMAScript 5's native `Object.keys`
			_.keys = nativeKeys \|\| function(obj) {
			if (obj !== Object(obj)) throw new TypeError('Invalid object');
			var keys = [];
			for (var key in obj) if (_.has(obj, key)) keys[keys.length] = key;
			return keys;
			};

			// Retrieve the values of an object's properties.
			_.values = function(obj) {
			return _.map(obj, _.identity);
			};

			// Return a sorted list of the function names available on the object.
			// Aliased as `methods`
			_.functions = _.methods = function(obj) {
			var names = [];
			for (var key in obj) {
			if (_.isFunction(obj[key])) names.push(key);
			}
			return names.sort();
			};

			// Extend a given object with all the properties in passed-in object(s).
			_.extend = function(obj) {
			each(slice.call(arguments, 1), function(source) {
			for (var prop in source) {
			obj[prop] = source[prop];
			}
			});
			return obj;
			};

			// Fill in a given object with default properties.
			_.defaults = function(obj) {
			each(slice.call(arguments, 1), function(source) {
			for (var prop in source) {
			if (obj[prop] == null) obj[prop] = source[prop];
			}
			});
			return obj;
			};

			// Create a (shallow-cloned) duplicate of an object.
			_.clone = function(obj) {
			if (!_.isObject(obj)) return obj;
			return _.isArray(obj) ? obj.slice() : _.extend({}, obj);
			};

			// Invokes interceptor with the obj, and then returns obj.
			// The primary purpose of this method is to "tap into" a method chain, in
			// order to perform operations on intermediate results within the chain.
			_.tap = function(obj, interceptor) {
			interceptor(obj);
			return obj;
			};

			// Internal recursive comparison function.
			function eq(a, b, stack) {
			// Identical objects are equal. `0 === -0`, but they aren't identical.
			// See the Harmony `egal` proposal: http://wiki.ecmascript.org/doku.php?id=harmony:egal.
			if (a === b) return a !== 0 \|\| 1 / a == 1 / b;
			// A strict comparison is necessary because `null == undefined`.
			if (a == null \|\| b == null) return a === b;
			// Unwrap any wrapped objects.
			if (a._chain) a = a._wrapped;
			if (b._chain) b = b._wrapped;
			// Invoke a custom `isEqual` method if one is provided.
			if (a.isEqual && _.isFunction(a.isEqual)) return a.isEqual(b);
			if (b.isEqual && _.isFunction(b.isEqual)) return b.isEqual(a);
			// Compare `[[Class]]` names.
			var className = toString.call(a);
			if (className != toString.call(b)) return false;
			switch (className) {
			// Strings, numbers, dates, and booleans are compared by value.
			case '[object String]':
			// Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
			// equivalent to `new String("5")`.
			return a == String(b);
			case '[object Number]':
			// `NaN`s are equivalent, but non-reflexive. An `egal` comparison is performed for
			// other numeric values.
			return a != +a ? b != +b : (a == 0 ? 1 / a == 1 / b : a == +b);
			case '[object Date]':
			case '[object Boolean]':
			// Coerce dates and booleans to numeric primitive values. Dates are compared by their
			// millisecond representations. Note that invalid dates with millisecond representations
			// of `NaN` are not equivalent.
			return +a == +b;
			// RegExps are compared by their source patterns and flags.
			case '[object RegExp]':
			return a.source == b.source &&
			a.global == b.global &&
			a.multiline == b.multiline &&
			a.ignoreCase == b.ignoreCase;
			}
			if (typeof a != 'object' \|\| typeof b != 'object') return false;
			// Assume equality for cyclic structures. The algorithm for detecting cyclic
			// structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.
			var length = stack.length;
			while (length--) {
			// Linear search. Performance is inversely proportional to the number of
			// unique nested structures.
			if (stack[length] == a) return true;
			}
			// Add the first object to the stack of traversed objects.
			stack.push(a);
			var size = 0, result = true;
			// Recursively compare objects and arrays.
			if (className == '[object Array]') {
			// Compare array lengths to determine if a deep comparison is necessary.
			size = a.length;
			result = size == b.length;
			if (result) {
			// Deep compare the contents, ignoring non-numeric properties.
			while (size--) {
			// Ensure commutative equality for sparse arrays.
			if (!(result = size in a == size in b && eq(a[size], b[size], stack))) break;
			}
			}
			} else {
			// Objects with different constructors are not equivalent.
			if ('constructor' in a != 'constructor' in b \|\| a.constructor != b.constructor) return false;
			// Deep compare objects.
			for (var key in a) {
			if (_.has(a, key)) {
			// Count the expected number of properties.
			size++;
			// Deep compare each member.
			if (!(result = _.has(b, key) && eq(a[key], b[key], stack))) break;
			}
			}
			// Ensure that both objects contain the same number of properties.
			if (result) {
			for (key in b) {
			if (_.has(b, key) && !(size--)) break;
			}
			result = !size;
			}
			}
			// Remove the first object from the stack of traversed objects.
			stack.pop();
			return result;
			}

			// Perform a deep comparison to check if two objects are equal.
			_.isEqual = function(a, b) {
			return eq(a, b, []);
			};

			// Is a given array, string, or object empty?
			// An "empty" object has no enumerable own-properties.
			_.isEmpty = function(obj) {
			if (_.isArray(obj) \|\| _.isString(obj)) return obj.length === 0;
			for (var key in obj) if (_.has(obj, key)) return false;
			return true;
			};

			// Is a given value a DOM element?
			_.isElement = function(obj) {
			return !!(obj && obj.nodeType == 1);
			};

			// Is a given value an array?
			// Delegates to ECMA5's native Array.isArray
			_.isArray = nativeIsArray \|\| function(obj) {
			return toString.call(obj) == '[object Array]';
			};

			// Is a given variable an object?
			_.isObject = function(obj) {
			return obj === Object(obj);
			};

			// Is a given variable an arguments object?
			_.isArguments = function(obj) {
			return toString.call(obj) == '[object Arguments]';
			};
			if (!_.isArguments(arguments)) {
			_.isArguments = function(obj) {
			return !!(obj && _.has(obj, 'callee'));
			};
			}

			// Is a given value a function?
			_.isFunction = function(obj) {
			return toString.call(obj) == '[object Function]';
			};

			// Is a given value a string?
			_.isString = function(obj) {
			return toString.call(obj) == '[object String]';
			};

			// Is a given value a number?
			_.isNumber = function(obj) {
			return toString.call(obj) == '[object Number]';
			};

			// Is the given value `NaN`?
			_.isNaN = function(obj) {
			// `NaN` is the only value for which `===` is not reflexive.
			return obj !== obj;
			};

			// Is a given value a boolean?
			_.isBoolean = function(obj) {
			return obj === true \|\| obj === false \|\| toString.call(obj) == '[object Boolean]';
			};

			// Is a given value a date?
			_.isDate = function(obj) {
			return toString.call(obj) == '[object Date]';
			};

			// Is the given value a regular expression?
			_.isRegExp = function(obj) {
			return toString.call(obj) == '[object RegExp]';
			};

			// Is a given value equal to null?
			_.isNull = function(obj) {
			return obj === null;
			};

			// Is a given variable undefined?
			_.isUndefined = function(obj) {
			return obj === void 0;
			};

			// Has own property?
			_.has = function(obj, key) {
			return hasOwnProperty.call(obj, key);
			};

			// Utility Functions
			// -----------------

			// Run Underscore.js in noConflict mode, returning the `_` variable to its
			// previous owner. Returns a reference to the Underscore object.
			_.noConflict = function() {
			root._ = previousUnderscore;
			return this;
			};

			// Keep the identity function around for default iterators.
			_.identity = function(value) {
			return value;
			};

			// Run a function n times.
			_.times = function (n, iterator, context) {
			for (var i = 0; i < n; i++) iterator.call(context, i);
			};

			// Escape a string for HTML interpolation.
			_.escape = function(string) {
			return (''+string).replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>').replace(/"/g, '"').replace(/'/g, ''').replace(/\//g,'/');
			};

			// Add your own custom functions to the Underscore object, ensuring that
			// they're correctly added to the OOP wrapper as well.
			_.mixin = function(obj) {
			each(_.functions(obj), function(name){
			addToWrapper(name, _[name] = obj[name]);
			});
			};

			// Generate a unique integer id (unique within the entire client session).
			// Useful for temporary DOM ids.
			var idCounter = 0;
			_.uniqueId = function(prefix) {
			var id = idCounter++;
			return prefix ? prefix + id : id;
			};

			// By default, Underscore uses ERB-style template delimiters, change the
			// following template settings to use alternative delimiters.
			_.templateSettings = {
			evaluate : /<%([\s\S]+?)%>/g,
			interpolate : /<%=([\s\S]+?)%>/g,
			escape : /<%-([\s\S]+?)%>/g
			};

			// When customizing `templateSettings`, if you don't want to define an
			// interpolation, evaluation or escaping regex, we need one that is
			// guaranteed not to match.
			var noMatch = /.^/;

			// Within an interpolation, evaluation, or escaping, remove HTML escaping
			// that had been previously added.
			var unescape = function(code) {
			return code.replace(/\\\\/g, '\\').replace(/\\'/g, "'");
			};

			// JavaScript micro-templating, similar to John Resig's implementation.
			// Underscore templating handles arbitrary delimiters, preserves whitespace,
			// and correctly escapes quotes within interpolated code.
			_.template = function(str, data) {
			var c = _.templateSettings;
			var tmpl = 'var __p=[],print=function(){__p.push.apply(__p,arguments);};' +
			'with(obj\|\|{}){__p.push(\'' +
			str.replace(/\\/g, '\\\\')
			.replace(/'/g, "\\'")
			.replace(c.escape \|\| noMatch, function(match, code) {
			return "',_.escape(" + unescape(code) + "),'";
			})
			.replace(c.interpolate \|\| noMatch, function(match, code) {
			return "'," + unescape(code) + ",'";
			})
			.replace(c.evaluate \|\| noMatch, function(match, code) {
			return "');" + unescape(code).replace(/[\r\n\t]/g, ' ') + ";__p.push('";
			})
			.replace(/\r/g, '\\r')
			.replace(/\n/g, '\\n')
			.replace(/\t/g, '\\t')
			+ "');}return __p.join('');";
			var func = new Function('obj', '_', tmpl);
			if (data) return func(data, _);
			return function(data) {
			return func.call(this, data, _);
			};
			};

			// Add a "chain" function, which will delegate to the wrapper.
			_.chain = function(obj) {
			return _(obj).chain();
			};

			// The OOP Wrapper
			// ---------------

			// If Underscore is called as a function, it returns a wrapped object that
			// can be used OO-style. This wrapper holds altered versions of all the
			// underscore functions. Wrapped objects may be chained.
			var wrapper = function(obj) { this._wrapped = obj; };

			// Expose `wrapper.prototype` as `_.prototype`
			_.prototype = wrapper.prototype;

			// Helper function to continue chaining intermediate results.
			var result = function(obj, chain) {
			return chain ? _(obj).chain() : obj;
			};

			// A method to easily add functions to the OOP wrapper.
			var addToWrapper = function(name, func) {
			wrapper.prototype[name] = function() {
			var args = slice.call(arguments);
			unshift.call(args, this._wrapped);
			return result(func.apply(_, args), this._chain);
			};
			};

			// Add all of the Underscore functions to the wrapper object.
			_.mixin(_);

			// Add all mutator Array functions to the wrapper.
			each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {
			var method = ArrayProto[name];
			wrapper.prototype[name] = function() {
			var wrapped = this._wrapped;
			method.apply(wrapped, arguments);
			var length = wrapped.length;
			if ((name == 'shift' \|\| name == 'splice') && length === 0) delete wrapped[0];
			return result(wrapped, this._chain);
			};
			});

			// Add all accessor Array functions to the wrapper.
			each(['concat', 'join', 'slice'], function(name) {
			var method = ArrayProto[name];
			wrapper.prototype[name] = function() {
			return result(method.apply(this._wrapped, arguments), this._chain);
			};
			});

			// Start chaining a wrapped Underscore object.
			wrapper.prototype.chain = function() {
			this._chain = true;
			return this;
			};

			// Extracts the result from a wrapped and chained object.
			wrapper.prototype.value = function() {
			return this._wrapped;
			};

			}).call(this);

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