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-// Underscore.js 1.8.3
-// http://underscorejs.org
-// (c) 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
-// Underscore may be freely distributed under the MIT license.
-
-(function() {
-
- // Baseline setup
- // --------------
-
- // Establish the root object, `window` in the browser, or `exports` on the server.
- var root = this;
-
- // Save the previous value of the `_` variable.
- var previousUnderscore = root._;
-
- // 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
- push = ArrayProto.push,
- slice = ArrayProto.slice,
- toString = ObjProto.toString,
- hasOwnProperty = ObjProto.hasOwnProperty;
-
- // All **ECMAScript 5** native function implementations that we hope to use
- // are declared here.
- var
- nativeIsArray = Array.isArray,
- nativeKeys = Object.keys,
- nativeBind = FuncProto.bind,
- nativeCreate = Object.create;
-
- // Naked function reference for surrogate-prototype-swapping.
- var Ctor = function(){};
-
- // Create a safe reference to the Underscore object for use below.
- var _ = function(obj) {
- if (obj instanceof _) return obj;
- if (!(this instanceof _)) return new _(obj);
- this._wrapped = 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.
- if (typeof exports !== 'undefined') {
- if (typeof module !== 'undefined' && module.exports) {
- exports = module.exports = _;
- }
- exports._ = _;
- } else {
- root._ = _;
- }
-
- // Current version.
- _.VERSION = '1.8.3';
-
- // Internal function that returns an efficient (for current engines) version
- // of the passed-in callback, to be repeatedly applied in other Underscore
- // functions.
- var optimizeCb = function(func, context, argCount) {
- if (context === void 0) return func;
- switch (argCount == null ? 3 : argCount) {
- case 1: return function(value) {
- return func.call(context, value);
- };
- case 2: return function(value, other) {
- return func.call(context, value, other);
- };
- case 3: return function(value, index, collection) {
- return func.call(context, value, index, collection);
- };
- case 4: return function(accumulator, value, index, collection) {
- return func.call(context, accumulator, value, index, collection);
- };
- }
- return function() {
- return func.apply(context, arguments);
- };
- };
-
- // A mostly-internal function to generate callbacks that can be applied
- // to each element in a collection, returning the desired result — either
- // identity, an arbitrary callback, a property matcher, or a property accessor.
- var cb = function(value, context, argCount) {
- if (value == null) return _.identity;
- if (_.isFunction(value)) return optimizeCb(value, context, argCount);
- if (_.isObject(value)) return _.matcher(value);
- return _.property(value);
- };
- _.iteratee = function(value, context) {
- return cb(value, context, Infinity);
- };
-
- // An internal function for creating assigner functions.
- var createAssigner = function(keysFunc, undefinedOnly) {
- return function(obj) {
- var length = arguments.length;
- if (length < 2 || obj == null) return obj;
- for (var index = 1; index < length; index++) {
- var source = arguments[index],
- keys = keysFunc(source),
- l = keys.length;
- for (var i = 0; i < l; i++) {
- var key = keys[i];
- if (!undefinedOnly || obj[key] === void 0) obj[key] = source[key];
- }
- }
- return obj;
- };
- };
-
- // An internal function for creating a new object that inherits from another.
- var baseCreate = function(prototype) {
- if (!_.isObject(prototype)) return {};
- if (nativeCreate) return nativeCreate(prototype);
- Ctor.prototype = prototype;
- var result = new Ctor;
- Ctor.prototype = null;
- return result;
- };
-
- var property = function(key) {
- return function(obj) {
- return obj == null ? void 0 : obj[key];
- };
- };
-
- // Helper for collection methods to determine whether a collection
- // should be iterated as an array or as an object
- // Related: http://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength
- // Avoids a very nasty iOS 8 JIT bug on ARM-64. #2094
- var MAX_ARRAY_INDEX = Math.pow(2, 53) - 1;
- var getLength = property('length');
- var isArrayLike = function(collection) {
- var length = getLength(collection);
- return typeof length == 'number' && length >= 0 && length <= MAX_ARRAY_INDEX;
- };
-
- // Collection Functions
- // --------------------
-
- // The cornerstone, an `each` implementation, aka `forEach`.
- // Handles raw objects in addition to array-likes. Treats all
- // sparse array-likes as if they were dense.
- _.each = _.forEach = function(obj, iteratee, context) {
- iteratee = optimizeCb(iteratee, context);
- var i, length;
- if (isArrayLike(obj)) {
- for (i = 0, length = obj.length; i < length; i++) {
- iteratee(obj[i], i, obj);
- }
- } else {
- var keys = _.keys(obj);
- for (i = 0, length = keys.length; i < length; i++) {
- iteratee(obj[keys[i]], keys[i], obj);
- }
- }
- return obj;
- };
-
- // Return the results of applying the iteratee to each element.
- _.map = _.collect = function(obj, iteratee, context) {
- iteratee = cb(iteratee, context);
- var keys = !isArrayLike(obj) && _.keys(obj),
- length = (keys || obj).length,
- results = Array(length);
- for (var index = 0; index < length; index++) {
- var currentKey = keys ? keys[index] : index;
- results[index] = iteratee(obj[currentKey], currentKey, obj);
- }
- return results;
- };
-
- // Create a reducing function iterating left or right.
- function createReduce(dir) {
- // Optimized iterator function as using arguments.length
- // in the main function will deoptimize the, see #1991.
- function iterator(obj, iteratee, memo, keys, index, length) {
- for (; index >= 0 && index < length; index += dir) {
- var currentKey = keys ? keys[index] : index;
- memo = iteratee(memo, obj[currentKey], currentKey, obj);
- }
- return memo;
- }
-
- return function(obj, iteratee, memo, context) {
- iteratee = optimizeCb(iteratee, context, 4);
- var keys = !isArrayLike(obj) && _.keys(obj),
- length = (keys || obj).length,
- index = dir > 0 ? 0 : length - 1;
- // Determine the initial value if none is provided.
- if (arguments.length < 3) {
- memo = obj[keys ? keys[index] : index];
- index += dir;
- }
- return iterator(obj, iteratee, memo, keys, index, length);
- };
- }
-
- // **Reduce** builds up a single result from a list of values, aka `inject`,
- // or `foldl`.
- _.reduce = _.foldl = _.inject = createReduce(1);
-
- // The right-associative version of reduce, also known as `foldr`.
- _.reduceRight = _.foldr = createReduce(-1);
-
- // Return the first value which passes a truth test. Aliased as `detect`.
- _.find = _.detect = function(obj, predicate, context) {
- var key;
- if (isArrayLike(obj)) {
- key = _.findIndex(obj, predicate, context);
- } else {
- key = _.findKey(obj, predicate, context);
- }
- if (key !== void 0 && key !== -1) return obj[key];
- };
-
- // Return all the elements that pass a truth test.
- // Aliased as `select`.
- _.filter = _.select = function(obj, predicate, context) {
- var results = [];
- predicate = cb(predicate, context);
- _.each(obj, function(value, index, list) {
- if (predicate(value, index, list)) results.push(value);
- });
- return results;
- };
-
- // Return all the elements for which a truth test fails.
- _.reject = function(obj, predicate, context) {
- return _.filter(obj, _.negate(cb(predicate)), context);
- };
-
- // Determine whether all of the elements match a truth test.
- // Aliased as `all`.
- _.every = _.all = function(obj, predicate, context) {
- predicate = cb(predicate, context);
- var keys = !isArrayLike(obj) && _.keys(obj),
- length = (keys || obj).length;
- for (var index = 0; index < length; index++) {
- var currentKey = keys ? keys[index] : index;
- if (!predicate(obj[currentKey], currentKey, obj)) return false;
- }
- return true;
- };
-
- // Determine if at least one element in the object matches a truth test.
- // Aliased as `any`.
- _.some = _.any = function(obj, predicate, context) {
- predicate = cb(predicate, context);
- var keys = !isArrayLike(obj) && _.keys(obj),
- length = (keys || obj).length;
- for (var index = 0; index < length; index++) {
- var currentKey = keys ? keys[index] : index;
- if (predicate(obj[currentKey], currentKey, obj)) return true;
- }
- return false;
- };
-
- // Determine if the array or object contains a given item (using `===`).
- // Aliased as `includes` and `include`.
- _.contains = _.includes = _.include = function(obj, item, fromIndex, guard) {
- if (!isArrayLike(obj)) obj = _.values(obj);
- if (typeof fromIndex != 'number' || guard) fromIndex = 0;
- return _.indexOf(obj, item, fromIndex) >= 0;
- };
-
- // Invoke a method (with arguments) on every item in a collection.
- _.invoke = function(obj, method) {
- var args = slice.call(arguments, 2);
- var isFunc = _.isFunction(method);
- return _.map(obj, function(value) {
- var func = isFunc ? method : value[method];
- return func == null ? func : func.apply(value, args);
- });
- };
-
- // Convenience version of a common use case of `map`: fetching a property.
- _.pluck = function(obj, key) {
- return _.map(obj, _.property(key));
- };
-
- // Convenience version of a common use case of `filter`: selecting only objects
- // containing specific `key:value` pairs.
- _.where = function(obj, attrs) {
- return _.filter(obj, _.matcher(attrs));
- };
-
- // Convenience version of a common use case of `find`: getting the first object
- // containing specific `key:value` pairs.
- _.findWhere = function(obj, attrs) {
- return _.find(obj, _.matcher(attrs));
- };
-
- // Return the maximum element (or element-based computation).
- _.max = function(obj, iteratee, context) {
- var result = -Infinity, lastComputed = -Infinity,
- value, computed;
- if (iteratee == null && obj != null) {
- obj = isArrayLike(obj) ? obj : _.values(obj);
- for (var i = 0, length = obj.length; i < length; i++) {
- value = obj[i];
- if (value > result) {
- result = value;
- }
- }
- } else {
- iteratee = cb(iteratee, context);
- _.each(obj, function(value, index, list) {
- computed = iteratee(value, index, list);
- if (computed > lastComputed || computed === -Infinity && result === -Infinity) {
- result = value;
- lastComputed = computed;
- }
- });
- }
- return result;
- };
-
- // Return the minimum element (or element-based computation).
- _.min = function(obj, iteratee, context) {
- var result = Infinity, lastComputed = Infinity,
- value, computed;
- if (iteratee == null && obj != null) {
- obj = isArrayLike(obj) ? obj : _.values(obj);
- for (var i = 0, length = obj.length; i < length; i++) {
- value = obj[i];
- if (value < result) {
- result = value;
- }
- }
- } else {
- iteratee = cb(iteratee, context);
- _.each(obj, function(value, index, list) {
- computed = iteratee(value, index, list);
- if (computed < lastComputed || computed === Infinity && result === Infinity) {
- result = value;
- lastComputed = computed;
- }
- });
- }
- return result;
- };
-
- // Shuffle a collection, using the modern version of the
- // [Fisher-Yates shuffle](http://en.wikipedia.org/wiki/Fisher–Yates_shuffle).
- _.shuffle = function(obj) {
- var set = isArrayLike(obj) ? obj : _.values(obj);
- var length = set.length;
- var shuffled = Array(length);
- for (var index = 0, rand; index < length; index++) {
- rand = _.random(0, index);
- if (rand !== index) shuffled[index] = shuffled[rand];
- shuffled[rand] = set[index];
- }
- return shuffled;
- };
-
- // Sample **n** random values from a collection.
- // If **n** is not specified, returns a single random element.
- // The internal `guard` argument allows it to work with `map`.
- _.sample = function(obj, n, guard) {
- if (n == null || guard) {
- if (!isArrayLike(obj)) obj = _.values(obj);
- return obj[_.random(obj.length - 1)];
- }
- return _.shuffle(obj).slice(0, Math.max(0, n));
- };
-
- // Sort the object's values by a criterion produced by an iteratee.
- _.sortBy = function(obj, iteratee, context) {
- iteratee = cb(iteratee, context);
- return _.pluck(_.map(obj, function(value, index, list) {
- return {
- value: value,
- index: index,
- criteria: iteratee(value, index, list)
- };
- }).sort(function(left, right) {
- var a = left.criteria;
- var b = right.criteria;
- if (a !== b) {
- if (a > b || a === void 0) return 1;
- if (a < b || b === void 0) return -1;
- }
- return left.index - right.index;
- }), 'value');
- };
-
- // An internal function used for aggregate "group by" operations.
- var group = function(behavior) {
- return function(obj, iteratee, context) {
- var result = {};
- iteratee = cb(iteratee, context);
- _.each(obj, function(value, index) {
- var key = iteratee(value, index, obj);
- behavior(result, value, key);
- });
- return result;
- };
- };
-
- // Groups the object's values by a criterion. Pass either a string attribute
- // to group by, or a function that returns the criterion.
- _.groupBy = group(function(result, value, key) {
- if (_.has(result, key)) result[key].push(value); else result[key] = [value];
- });
-
- // Indexes the object's values by a criterion, similar to `groupBy`, but for
- // when you know that your index values will be unique.
- _.indexBy = group(function(result, value, key) {
- result[key] = value;
- });
-
- // Counts instances of an object that group by a certain criterion. Pass
- // either a string attribute to count by, or a function that returns the
- // criterion.
- _.countBy = group(function(result, value, key) {
- if (_.has(result, key)) result[key]++; else result[key] = 1;
- });
-
- // Safely create a real, live array from anything iterable.
- _.toArray = function(obj) {
- if (!obj) return [];
- if (_.isArray(obj)) return slice.call(obj);
- if (isArrayLike(obj)) return _.map(obj, _.identity);
- return _.values(obj);
- };
-
- // Return the number of elements in an object.
- _.size = function(obj) {
- if (obj == null) return 0;
- return isArrayLike(obj) ? obj.length : _.keys(obj).length;
- };
-
- // Split a collection into two arrays: one whose elements all satisfy the given
- // predicate, and one whose elements all do not satisfy the predicate.
- _.partition = function(obj, predicate, context) {
- predicate = cb(predicate, context);
- var pass = [], fail = [];
- _.each(obj, function(value, key, obj) {
- (predicate(value, key, obj) ? pass : fail).push(value);
- });
- return [pass, fail];
- };
-
- // Array Functions
- // ---------------
-
- // Get the first element of an array. Passing **n** will return the first N
- // values in the array. Aliased as `head` and `take`. The **guard** check
- // allows it to work with `_.map`.
- _.first = _.head = _.take = function(array, n, guard) {
- if (array == null) return void 0;
- if (n == null || guard) return array[0];
- return _.initial(array, array.length - n);
- };
-
- // Returns everything but the last entry of the array. Especially useful on
- // the arguments object. Passing **n** will return all the values in
- // the array, excluding the last N.
- _.initial = function(array, n, guard) {
- return slice.call(array, 0, Math.max(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.
- _.last = function(array, n, guard) {
- if (array == null) return void 0;
- if (n == null || guard) return array[array.length - 1];
- return _.rest(array, Math.max(0, array.length - n));
- };
-
- // Returns everything but the first entry of the array. Aliased as `tail` and `drop`.
- // Especially useful on the arguments object. Passing an **n** will return
- // the rest N values in the array.
- _.rest = _.tail = _.drop = function(array, n, guard) {
- return slice.call(array, n == null || guard ? 1 : n);
- };
-
- // Trim out all falsy values from an array.
- _.compact = function(array) {
- return _.filter(array, _.identity);
- };
-
- // Internal implementation of a recursive `flatten` function.
- var flatten = function(input, shallow, strict, startIndex) {
- var output = [], idx = 0;
- for (var i = startIndex || 0, length = getLength(input); i < length; i++) {
- var value = input[i];
- if (isArrayLike(value) && (_.isArray(value) || _.isArguments(value))) {
- //flatten current level of array or arguments object
- if (!shallow) value = flatten(value, shallow, strict);
- var j = 0, len = value.length;
- output.length += len;
- while (j < len) {
- output[idx++] = value[j++];
- }
- } else if (!strict) {
- output[idx++] = value;
- }
- }
- return output;
- };
-
- // Flatten out an array, either recursively (by default), or just one level.
- _.flatten = function(array, shallow) {
- return flatten(array, shallow, false);
- };
-
- // 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, iteratee, context) {
- if (!_.isBoolean(isSorted)) {
- context = iteratee;
- iteratee = isSorted;
- isSorted = false;
- }
- if (iteratee != null) iteratee = cb(iteratee, context);
- var result = [];
- var seen = [];
- for (var i = 0, length = getLength(array); i < length; i++) {
- var value = array[i],
- computed = iteratee ? iteratee(value, i, array) : value;
- if (isSorted) {
- if (!i || seen !== computed) result.push(value);
- seen = computed;
- } else if (iteratee) {
- if (!_.contains(seen, computed)) {
- seen.push(computed);
- result.push(value);
- }
- } else if (!_.contains(result, value)) {
- result.push(value);
- }
- }
- 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, true));
- };
-
- // Produce an array that contains every item shared between all the
- // passed-in arrays.
- _.intersection = function(array) {
- var result = [];
- var argsLength = arguments.length;
- for (var i = 0, length = getLength(array); i < length; i++) {
- var item = array[i];
- if (_.contains(result, item)) continue;
- for (var j = 1; j < argsLength; j++) {
- if (!_.contains(arguments[j], item)) break;
- }
- if (j === argsLength) result.push(item);
- }
- return result;
- };
-
- // 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(arguments, true, true, 1);
- return _.filter(array, function(value){
- return !_.contains(rest, value);
- });
- };
-
- // Zip together multiple lists into a single array -- elements that share
- // an index go together.
- _.zip = function() {
- return _.unzip(arguments);
- };
-
- // Complement of _.zip. Unzip accepts an array of arrays and groups
- // each array's elements on shared indices
- _.unzip = function(array) {
- var length = array && _.max(array, getLength).length || 0;
- var result = Array(length);
-
- for (var index = 0; index < length; index++) {
- result[index] = _.pluck(array, index);
- }
- return result;
- };
-
- // Converts lists into objects. Pass either a single array of `[key, value]`
- // pairs, or two parallel arrays of the same length -- one of keys, and one of
- // the corresponding values.
- _.object = function(list, values) {
- var result = {};
- for (var i = 0, length = getLength(list); i < length; i++) {
- if (values) {
- result[list[i]] = values[i];
- } else {
- result[list[i][0]] = list[i][1];
- }
- }
- return result;
- };
-
- // Generator function to create the findIndex and findLastIndex functions
- function createPredicateIndexFinder(dir) {
- return function(array, predicate, context) {
- predicate = cb(predicate, context);
- var length = getLength(array);
- var index = dir > 0 ? 0 : length - 1;
- for (; index >= 0 && index < length; index += dir) {
- if (predicate(array[index], index, array)) return index;
- }
- return -1;
- };
- }
-
- // Returns the first index on an array-like that passes a predicate test
- _.findIndex = createPredicateIndexFinder(1);
- _.findLastIndex = createPredicateIndexFinder(-1);
-
- // Use a comparator function to figure out the smallest index at which
- // an object should be inserted so as to maintain order. Uses binary search.
- _.sortedIndex = function(array, obj, iteratee, context) {
- iteratee = cb(iteratee, context, 1);
- var value = iteratee(obj);
- var low = 0, high = getLength(array);
- while (low < high) {
- var mid = Math.floor((low + high) / 2);
- if (iteratee(array[mid]) < value) low = mid + 1; else high = mid;
- }
- return low;
- };
-
- // Generator function to create the indexOf and lastIndexOf functions
- function createIndexFinder(dir, predicateFind, sortedIndex) {
- return function(array, item, idx) {
- var i = 0, length = getLength(array);
- if (typeof idx == 'number') {
- if (dir > 0) {
- i = idx >= 0 ? idx : Math.max(idx + length, i);
- } else {
- length = idx >= 0 ? Math.min(idx + 1, length) : idx + length + 1;
- }
- } else if (sortedIndex && idx && length) {
- idx = sortedIndex(array, item);
- return array[idx] === item ? idx : -1;
- }
- if (item !== item) {
- idx = predicateFind(slice.call(array, i, length), _.isNaN);
- return idx >= 0 ? idx + i : -1;
- }
- for (idx = dir > 0 ? i : length - 1; idx >= 0 && idx < length; idx += dir) {
- if (array[idx] === item) return idx;
- }
- return -1;
- };
- }
-
- // Return the position of the first occurrence of an item in an array,
- // or -1 if the item is not included in the array.
- // If the array is large and already in sort order, pass `true`
- // for **isSorted** to use binary search.
- _.indexOf = createIndexFinder(1, _.findIndex, _.sortedIndex);
- _.lastIndexOf = createIndexFinder(-1, _.findLastIndex);
-
- // 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 (stop == null) {
- stop = start || 0;
- start = 0;
- }
- step = step || 1;
-
- var length = Math.max(Math.ceil((stop - start) / step), 0);
- var range = Array(length);
-
- for (var idx = 0; idx < length; idx++, start += step) {
- range[idx] = start;
- }
-
- return range;
- };
-
- // Function (ahem) Functions
- // ------------------
-
- // Determines whether to execute a function as a constructor
- // or a normal function with the provided arguments
- var executeBound = function(sourceFunc, boundFunc, context, callingContext, args) {
- if (!(callingContext instanceof boundFunc)) return sourceFunc.apply(context, args);
- var self = baseCreate(sourceFunc.prototype);
- var result = sourceFunc.apply(self, args);
- if (_.isObject(result)) return result;
- return self;
- };
-
- // Create a function bound to a given object (assigning `this`, and arguments,
- // optionally). Delegates to **ECMAScript 5**'s native `Function.bind` if
- // available.
- _.bind = function(func, context) {
- if (nativeBind && func.bind === nativeBind) return nativeBind.apply(func, slice.call(arguments, 1));
- if (!_.isFunction(func)) throw new TypeError('Bind must be called on a function');
- var args = slice.call(arguments, 2);
- var bound = function() {
- return executeBound(func, bound, context, this, args.concat(slice.call(arguments)));
- };
- return bound;
- };
-
- // Partially apply a function by creating a version that has had some of its
- // arguments pre-filled, without changing its dynamic `this` context. _ acts
- // as a placeholder, allowing any combination of arguments to be pre-filled.
- _.partial = function(func) {
- var boundArgs = slice.call(arguments, 1);
- var bound = function() {
- var position = 0, length = boundArgs.length;
- var args = Array(length);
- for (var i = 0; i < length; i++) {
- args[i] = boundArgs[i] === _ ? arguments[position++] : boundArgs[i];
- }
- while (position < arguments.length) args.push(arguments[position++]);
- return executeBound(func, bound, this, this, args);
- };
- return bound;
- };
-
- // Bind a number of an object's methods to that object. Remaining arguments
- // are the method names to be bound. Useful for ensuring that all callbacks
- // defined on an object belong to it.
- _.bindAll = function(obj) {
- var i, length = arguments.length, key;
- if (length <= 1) throw new Error('bindAll must be passed function names');
- for (i = 1; i < length; i++) {
- key = arguments[i];
- obj[key] = _.bind(obj[key], obj);
- }
- return obj;
- };
-
- // Memoize an expensive function by storing its results.
- _.memoize = function(func, hasher) {
- var memoize = function(key) {
- var cache = memoize.cache;
- var address = '' + (hasher ? hasher.apply(this, arguments) : key);
- if (!_.has(cache, address)) cache[address] = func.apply(this, arguments);
- return cache[address];
- };
- memoize.cache = {};
- return memoize;
- };
-
- // 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(null, args);
- }, wait);
- };
-
- // Defers a function, scheduling it to run after the current call stack has
- // cleared.
- _.defer = _.partial(_.delay, _, 1);
-
- // Returns a function, that, when invoked, will only be triggered at most once
- // during a given window of time. Normally, the throttled function will run
- // as much as it can, without ever going more than once per `wait` duration;
- // but if you'd like to disable the execution on the leading edge, pass
- // `{leading: false}`. To disable execution on the trailing edge, ditto.
- _.throttle = function(func, wait, options) {
- var context, args, result;
- var timeout = null;
- var previous = 0;
- if (!options) options = {};
- var later = function() {
- previous = options.leading === false ? 0 : _.now();
- timeout = null;
- result = func.apply(context, args);
- if (!timeout) context = args = null;
- };
- return function() {
- var now = _.now();
- if (!previous && options.leading === false) previous = now;
- var remaining = wait - (now - previous);
- context = this;
- args = arguments;
- if (remaining <= 0 || remaining > wait) {
- if (timeout) {
- clearTimeout(timeout);
- timeout = null;
- }
- previous = now;
- result = func.apply(context, args);
- if (!timeout) context = args = null;
- } else if (!timeout && options.trailing !== false) {
- timeout = setTimeout(later, remaining);
- }
- return result;
- };
- };
-
- // 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. If `immediate` is passed, trigger the function on the
- // leading edge, instead of the trailing.
- _.debounce = function(func, wait, immediate) {
- var timeout, args, context, timestamp, result;
-
- var later = function() {
- var last = _.now() - timestamp;
-
- if (last < wait && last >= 0) {
- timeout = setTimeout(later, wait - last);
- } else {
- timeout = null;
- if (!immediate) {
- result = func.apply(context, args);
- if (!timeout) context = args = null;
- }
- }
- };
-
- return function() {
- context = this;
- args = arguments;
- timestamp = _.now();
- var callNow = immediate && !timeout;
- if (!timeout) timeout = setTimeout(later, wait);
- if (callNow) {
- result = func.apply(context, args);
- context = args = null;
- }
-
- return result;
- };
- };
-
- // 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 _.partial(wrapper, func);
- };
-
- // Returns a negated version of the passed-in predicate.
- _.negate = function(predicate) {
- return function() {
- return !predicate.apply(this, arguments);
- };
- };
-
- // 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 args = arguments;
- var start = args.length - 1;
- return function() {
- var i = start;
- var result = args[start].apply(this, arguments);
- while (i--) result = args[i].call(this, result);
- return result;
- };
- };
-
- // Returns a function that will only be executed on and after the Nth call.
- _.after = function(times, func) {
- return function() {
- if (--times < 1) {
- return func.apply(this, arguments);
- }
- };
- };
-
- // Returns a function that will only be executed up to (but not including) the Nth call.
- _.before = function(times, func) {
- var memo;
- return function() {
- if (--times > 0) {
- memo = func.apply(this, arguments);
- }
- if (times <= 1) func = null;
- return memo;
- };
- };
-
- // Returns a function that will be executed at most one time, no matter how
- // often you call it. Useful for lazy initialization.
- _.once = _.partial(_.before, 2);
-
- // Object Functions
- // ----------------
-
- // Keys in IE < 9 that won't be iterated by `for key in ...` and thus missed.
- var hasEnumBug = !{toString: null}.propertyIsEnumerable('toString');
- var nonEnumerableProps = ['valueOf', 'isPrototypeOf', 'toString',
- 'propertyIsEnumerable', 'hasOwnProperty', 'toLocaleString'];
-
- function collectNonEnumProps(obj, keys) {
- var nonEnumIdx = nonEnumerableProps.length;
- var constructor = obj.constructor;
- var proto = (_.isFunction(constructor) && constructor.prototype) || ObjProto;
-
- // Constructor is a special case.
- var prop = 'constructor';
- if (_.has(obj, prop) && !_.contains(keys, prop)) keys.push(prop);
-
- while (nonEnumIdx--) {
- prop = nonEnumerableProps[nonEnumIdx];
- if (prop in obj && obj[prop] !== proto[prop] && !_.contains(keys, prop)) {
- keys.push(prop);
- }
- }
- }
-
- // Retrieve the names of an object's own properties.
- // Delegates to **ECMAScript 5**'s native `Object.keys`
- _.keys = function(obj) {
- if (!_.isObject(obj)) return [];
- if (nativeKeys) return nativeKeys(obj);
- var keys = [];
- for (var key in obj) if (_.has(obj, key)) keys.push(key);
- // Ahem, IE < 9.
- if (hasEnumBug) collectNonEnumProps(obj, keys);
- return keys;
- };
-
- // Retrieve all the property names of an object.
- _.allKeys = function(obj) {
- if (!_.isObject(obj)) return [];
- var keys = [];
- for (var key in obj) keys.push(key);
- // Ahem, IE < 9.
- if (hasEnumBug) collectNonEnumProps(obj, keys);
- return keys;
- };
-
- // Retrieve the values of an object's properties.
- _.values = function(obj) {
- var keys = _.keys(obj);
- var length = keys.length;
- var values = Array(length);
- for (var i = 0; i < length; i++) {
- values[i] = obj[keys[i]];
- }
- return values;
- };
-
- // Returns the results of applying the iteratee to each element of the object
- // In contrast to _.map it returns an object
- _.mapObject = function(obj, iteratee, context) {
- iteratee = cb(iteratee, context);
- var keys = _.keys(obj),
- length = keys.length,
- results = {},
- currentKey;
- for (var index = 0; index < length; index++) {
- currentKey = keys[index];
- results[currentKey] = iteratee(obj[currentKey], currentKey, obj);
- }
- return results;
- };
-
- // Convert an object into a list of `[key, value]` pairs.
- _.pairs = function(obj) {
- var keys = _.keys(obj);
- var length = keys.length;
- var pairs = Array(length);
- for (var i = 0; i < length; i++) {
- pairs[i] = [keys[i], obj[keys[i]]];
- }
- return pairs;
- };
-
- // Invert the keys and values of an object. The values must be serializable.
- _.invert = function(obj) {
- var result = {};
- var keys = _.keys(obj);
- for (var i = 0, length = keys.length; i < length; i++) {
- result[obj[keys[i]]] = keys[i];
- }
- return result;
- };
-
- // 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 = createAssigner(_.allKeys);
-
- // Assigns a given object with all the own properties in the passed-in object(s)
- // (https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
- _.extendOwn = _.assign = createAssigner(_.keys);
-
- // Returns the first key on an object that passes a predicate test
- _.findKey = function(obj, predicate, context) {
- predicate = cb(predicate, context);
- var keys = _.keys(obj), key;
- for (var i = 0, length = keys.length; i < length; i++) {
- key = keys[i];
- if (predicate(obj[key], key, obj)) return key;
- }
- };
-
- // Return a copy of the object only containing the whitelisted properties.
- _.pick = function(object, oiteratee, context) {
- var result = {}, obj = object, iteratee, keys;
- if (obj == null) return result;
- if (_.isFunction(oiteratee)) {
- keys = _.allKeys(obj);
- iteratee = optimizeCb(oiteratee, context);
- } else {
- keys = flatten(arguments, false, false, 1);
- iteratee = function(value, key, obj) { return key in obj; };
- obj = Object(obj);
- }
- for (var i = 0, length = keys.length; i < length; i++) {
- var key = keys[i];
- var value = obj[key];
- if (iteratee(value, key, obj)) result[key] = value;
- }
- return result;
- };
-
- // Return a copy of the object without the blacklisted properties.
- _.omit = function(obj, iteratee, context) {
- if (_.isFunction(iteratee)) {
- iteratee = _.negate(iteratee);
- } else {
- var keys = _.map(flatten(arguments, false, false, 1), String);
- iteratee = function(value, key) {
- return !_.contains(keys, key);
- };
- }
- return _.pick(obj, iteratee, context);
- };
-
- // Fill in a given object with default properties.
- _.defaults = createAssigner(_.allKeys, true);
-
- // Creates an object that inherits from the given prototype object.
- // If additional properties are provided then they will be added to the
- // created object.
- _.create = function(prototype, props) {
- var result = baseCreate(prototype);
- if (props) _.extendOwn(result, props);
- return result;
- };
-
- // 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;
- };
-
- // Returns whether an object has a given set of `key:value` pairs.
- _.isMatch = function(object, attrs) {
- var keys = _.keys(attrs), length = keys.length;
- if (object == null) return !length;
- var obj = Object(object);
- for (var i = 0; i < length; i++) {
- var key = keys[i];
- if (attrs[key] !== obj[key] || !(key in obj)) return false;
- }
- return true;
- };
-
-
- // Internal recursive comparison function for `isEqual`.
- var eq = function(a, b, aStack, bStack) {
- // 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 instanceof _) a = a._wrapped;
- if (b instanceof _) b = b._wrapped;
- // Compare `[[Class]]` names.
- var className = toString.call(a);
- if (className !== toString.call(b)) return false;
- switch (className) {
- // Strings, numbers, regular expressions, dates, and booleans are compared by value.
- case '[object RegExp]':
- // RegExps are coerced to strings for comparison (Note: '' + /a/i === '/a/i')
- case '[object String]':
- // Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
- // equivalent to `new String("5")`.
- return '' + a === '' + b;
- case '[object Number]':
- // `NaN`s are equivalent, but non-reflexive.
- // Object(NaN) is equivalent to NaN
- if (+a !== +a) return +b !== +b;
- // An `egal` comparison is performed for other numeric values.
- return +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;
- }
-
- var areArrays = className === '[object Array]';
- if (!areArrays) {
- if (typeof a != 'object' || typeof b != 'object') return false;
-
- // Objects with different constructors are not equivalent, but `Object`s or `Array`s
- // from different frames are.
- var aCtor = a.constructor, bCtor = b.constructor;
- if (aCtor !== bCtor && !(_.isFunction(aCtor) && aCtor instanceof aCtor &&
- _.isFunction(bCtor) && bCtor instanceof bCtor)
- && ('constructor' in a && 'constructor' in b)) {
- 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`.
-
- // Initializing stack of traversed objects.
- // It's done here since we only need them for objects and arrays comparison.
- aStack = aStack || [];
- bStack = bStack || [];
- var length = aStack.length;
- while (length--) {
- // Linear search. Performance is inversely proportional to the number of
- // unique nested structures.
- if (aStack[length] === a) return bStack[length] === b;
- }
-
- // Add the first object to the stack of traversed objects.
- aStack.push(a);
- bStack.push(b);
-
- // Recursively compare objects and arrays.
- if (areArrays) {
- // Compare array lengths to determine if a deep comparison is necessary.
- length = a.length;
- if (length !== b.length) return false;
- // Deep compare the contents, ignoring non-numeric properties.
- while (length--) {
- if (!eq(a[length], b[length], aStack, bStack)) return false;
- }
- } else {
- // Deep compare objects.
- var keys = _.keys(a), key;
- length = keys.length;
- // Ensure that both objects contain the same number of properties before comparing deep equality.
- if (_.keys(b).length !== length) return false;
- while (length--) {
- // Deep compare each member
- key = keys[length];
- if (!(_.has(b, key) && eq(a[key], b[key], aStack, bStack))) return false;
- }
- }
- // Remove the first object from the stack of traversed objects.
- aStack.pop();
- bStack.pop();
- return true;
- };
-
- // 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 (obj == null) return true;
- if (isArrayLike(obj) && (_.isArray(obj) || _.isString(obj) || _.isArguments(obj))) return obj.length === 0;
- return _.keys(obj).length === 0;
- };
-
- // 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) {
- var type = typeof obj;
- return type === 'function' || type === 'object' && !!obj;
- };
-
- // Add some isType methods: isArguments, isFunction, isString, isNumber, isDate, isRegExp, isError.
- _.each(['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp', 'Error'], function(name) {
- _['is' + name] = function(obj) {
- return toString.call(obj) === '[object ' + name + ']';
- };
- });
-
- // Define a fallback version of the method in browsers (ahem, IE < 9), where
- // there isn't any inspectable "Arguments" type.
- if (!_.isArguments(arguments)) {
- _.isArguments = function(obj) {
- return _.has(obj, 'callee');
- };
- }
-
- // Optimize `isFunction` if appropriate. Work around some typeof bugs in old v8,
- // IE 11 (#1621), and in Safari 8 (#1929).
- if (typeof /./ != 'function' && typeof Int8Array != 'object') {
- _.isFunction = function(obj) {
- return typeof obj == 'function' || false;
- };
- }
-
- // Is a given object a finite number?
- _.isFinite = function(obj) {
- return isFinite(obj) && !isNaN(parseFloat(obj));
- };
-
- // Is the given value `NaN`? (NaN is the only number which does not equal itself).
- _.isNaN = function(obj) {
- return _.isNumber(obj) && 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 equal to null?
- _.isNull = function(obj) {
- return obj === null;
- };
-
- // Is a given variable undefined?
- _.isUndefined = function(obj) {
- return obj === void 0;
- };
-
- // Shortcut function for checking if an object has a given property directly
- // on itself (in other words, not on a prototype).
- _.has = function(obj, key) {
- return obj != null && 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 iteratees.
- _.identity = function(value) {
- return value;
- };
-
- // Predicate-generating functions. Often useful outside of Underscore.
- _.constant = function(value) {
- return function() {
- return value;
- };
- };
-
- _.noop = function(){};
-
- _.property = property;
-
- // Generates a function for a given object that returns a given property.
- _.propertyOf = function(obj) {
- return obj == null ? function(){} : function(key) {
- return obj[key];
- };
- };
-
- // Returns a predicate for checking whether an object has a given set of
- // `key:value` pairs.
- _.matcher = _.matches = function(attrs) {
- attrs = _.extendOwn({}, attrs);
- return function(obj) {
- return _.isMatch(obj, attrs);
- };
- };
-
- // Run a function **n** times.
- _.times = function(n, iteratee, context) {
- var accum = Array(Math.max(0, n));
- iteratee = optimizeCb(iteratee, context, 1);
- for (var i = 0; i < n; i++) accum[i] = iteratee(i);
- return accum;
- };
-
- // Return a random integer between min and max (inclusive).
- _.random = function(min, max) {
- if (max == null) {
- max = min;
- min = 0;
- }
- return min + Math.floor(Math.random() * (max - min + 1));
- };
-
- // A (possibly faster) way to get the current timestamp as an integer.
- _.now = Date.now || function() {
- return new Date().getTime();
- };
-
- // List of HTML entities for escaping.
- var escapeMap = {
- '&': '&amp;',
- '<': '&lt;',
- '>': '&gt;',
- '"': '&quot;',
- "'": '&#x27;',
- '`': '&#x60;'
- };
- var unescapeMap = _.invert(escapeMap);
-
- // Functions for escaping and unescaping strings to/from HTML interpolation.
- var createEscaper = function(map) {
- var escaper = function(match) {
- return map[match];
- };
- // Regexes for identifying a key that needs to be escaped
- var source = '(?:' + _.keys(map).join('|') + ')';
- var testRegexp = RegExp(source);
- var replaceRegexp = RegExp(source, 'g');
- return function(string) {
- string = string == null ? '' : '' + string;
- return testRegexp.test(string) ? string.replace(replaceRegexp, escaper) : string;
- };
- };
- _.escape = createEscaper(escapeMap);
- _.unescape = createEscaper(unescapeMap);
-
- // If the value of the named `property` is a function then invoke it with the
- // `object` as context; otherwise, return it.
- _.result = function(object, property, fallback) {
- var value = object == null ? void 0 : object[property];
- if (value === void 0) {
- value = fallback;
- }
- return _.isFunction(value) ? value.call(object) : value;
- };
-
- // 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 = /(.)^/;
-
- // Certain characters need to be escaped so that they can be put into a
- // string literal.
- var escapes = {
- "'": "'",
- '\\': '\\',
- '\r': 'r',
- '\n': 'n',
- '\u2028': 'u2028',
- '\u2029': 'u2029'
- };
-
- var escaper = /\\|'|\r|\n|\u2028|\u2029/g;
-
- var escapeChar = function(match) {
- return '\\' + escapes[match];
- };
-
- // JavaScript micro-templating, similar to John Resig's implementation.
- // Underscore templating handles arbitrary delimiters, preserves whitespace,
- // and correctly escapes quotes within interpolated code.
- // NB: `oldSettings` only exists for backwards compatibility.
- _.template = function(text, settings, oldSettings) {
- if (!settings && oldSettings) settings = oldSettings;
- settings = _.defaults({}, settings, _.templateSettings);
-
- // Combine delimiters into one regular expression via alternation.
- var matcher = RegExp([
- (settings.escape || noMatch).source,
- (settings.interpolate || noMatch).source,
- (settings.evaluate || noMatch).source
- ].join('|') + '|$', 'g');
-
- // Compile the template source, escaping string literals appropriately.
- var index = 0;
- var source = "__p+='";
- text.replace(matcher, function(match, escape, interpolate, evaluate, offset) {
- source += text.slice(index, offset).replace(escaper, escapeChar);
- index = offset + match.length;
-
- if (escape) {
- source += "'+\n((__t=(" + escape + "))==null?'':_.escape(__t))+\n'";
- } else if (interpolate) {
- source += "'+\n((__t=(" + interpolate + "))==null?'':__t)+\n'";
- } else if (evaluate) {
- source += "';\n" + evaluate + "\n__p+='";
- }
-
- // Adobe VMs need the match returned to produce the correct offest.
- return match;
- });
- source += "';\n";
-
- // If a variable is not specified, place data values in local scope.
- if (!settings.variable) source = 'with(obj||{}){\n' + source + '}\n';
-
- source = "var __t,__p='',__j=Array.prototype.join," +
- "print=function(){__p+=__j.call(arguments,'');};\n" +
- source + 'return __p;\n';
-
- try {
- var render = new Function(settings.variable || 'obj', '_', source);
- } catch (e) {
- e.source = source;
- throw e;
- }
-
- var template = function(data) {
- return render.call(this, data, _);
- };
-
- // Provide the compiled source as a convenience for precompilation.
- var argument = settings.variable || 'obj';
- template.source = 'function(' + argument + '){\n' + source + '}';
-
- return template;
- };
-
- // Add a "chain" function. Start chaining a wrapped Underscore object.
- _.chain = function(obj) {
- var instance = _(obj);
- instance._chain = true;
- return instance;
- };
-
- // OOP
- // ---------------
- // 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.
-
- // Helper function to continue chaining intermediate results.
- var result = function(instance, obj) {
- return instance._chain ? _(obj).chain() : obj;
- };
-
- // Add your own custom functions to the Underscore object.
- _.mixin = function(obj) {
- _.each(_.functions(obj), function(name) {
- var func = _[name] = obj[name];
- _.prototype[name] = function() {
- var args = [this._wrapped];
- push.apply(args, arguments);
- return result(this, func.apply(_, args));
- };
- });
- };
-
- // 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];
- _.prototype[name] = function() {
- var obj = this._wrapped;
- method.apply(obj, arguments);
- if ((name === 'shift' || name === 'splice') && obj.length === 0) delete obj[0];
- return result(this, obj);
- };
- });
-
- // Add all accessor Array functions to the wrapper.
- _.each(['concat', 'join', 'slice'], function(name) {
- var method = ArrayProto[name];
- _.prototype[name] = function() {
- return result(this, method.apply(this._wrapped, arguments));
- };
- });
-
- // Extracts the result from a wrapped and chained object.
- _.prototype.value = function() {
- return this._wrapped;
- };
-
- // Provide unwrapping proxy for some methods used in engine operations
- // such as arithmetic and JSON stringification.
- _.prototype.valueOf = _.prototype.toJSON = _.prototype.value;
-
- _.prototype.toString = function() {
- return '' + this._wrapped;
- };
-
- // AMD registration happens at the end for compatibility with AMD loaders
- // that may not enforce next-turn semantics on modules. Even though general
- // practice for AMD registration is to be anonymous, underscore registers
- // as a named module because, like jQuery, it is a base library that is
- // popular enough to be bundled in a third party lib, but not be part of
- // an AMD load request. Those cases could generate an error when an
- // anonymous define() is called outside of a loader request.
- if (typeof define === 'function' && define.amd) {
- define('underscore', [], function() {
- return _;
- });
- }
-}.call(this));