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// Underscore.js 1.9.1 // http://underscorejs.org // (c) 2009-2018 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors // Underscore may be freely distributed under the MIT license. (function() { // Baseline setup // -------------- // Establish the root object, `window` (`self`) in the browser, `global` // on the server, or `this` in some virtual machines. We use `self` // instead of `window` for `WebWorker` support. var root = typeof self == 'object' && self.self === self && self \|\| typeof global == 'object' && global.global === global && global \|\| 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; var SymbolProto = typeof Symbol !== 'undefined' ? Symbol.prototype : null; // 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, 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 their old module API. If we're in // the browser, add `_` as a global object. // (`nodeType` is checked to ensure that `module` // and `exports` are not HTML elements.) if (typeof exports != 'undefined' && !exports.nodeType) { if (typeof module != 'undefined' && !module.nodeType && module.exports) { exports = module.exports = _; } exports._ = _; } else { root._ = _; } // Current version. _.VERSION = '1.9.1'; // 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); }; // The 2-argument case is omitted because we’re not using it. 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); }; }; var builtinIteratee; // An 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 (_.iteratee !== builtinIteratee) return _.iteratee(value, context); if (value == null) return _.identity; if (_.isFunction(value)) return optimizeCb(value, context, argCount); if (_.isObject(value) && !_.isArray(value)) return _.matcher(value); return _.property(value); }; // External wrapper for our callback generator. Users may customize // `_.iteratee` if they want additional predicate/iteratee shorthand styles. // This abstraction hides the internal-only argCount argument. _.iteratee = builtinIteratee = function(value, context) { return cb(value, context, Infinity); }; // Some functions take a variable number of arguments, or a few expected // arguments at the beginning and then a variable number of values to operate // on. This helper accumulates all remaining arguments past the function’s // argument length (or an explicit `startIndex`), into an array that becomes // the last argument. Similar to ES6’s "rest parameter". var restArguments = function(func, startIndex) { startIndex = startIndex == null ? func.length - 1 : +startIndex; return function() { var length = Math.max(arguments.length - startIndex, 0), rest = Array(length), index = 0; for (; index < length; index++) { rest[index] = arguments[index + startIndex]; } switch (startIndex) { case 0: return func.call(this, rest); case 1: return func.call(this, arguments[0], rest); case 2: return func.call(this, arguments[0], arguments[1], rest); } var args = Array(startIndex + 1); for (index = 0; index < startIndex; index++) { args[index] = arguments[index]; } args[startIndex] = rest; return func.apply(this, args); }; }; // 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 shallowProperty = function(key) { return function(obj) { return obj == null ? void 0 : obj[key]; }; }; var has = function(obj, path) { return obj != null && hasOwnProperty.call(obj, path); } var deepGet = function(obj, path) { var length = path.length; for (var i = 0; i < length; i++) { if (obj == null) return void 0; obj = obj[path[i]]; } return length ? obj : void 0; }; // 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 = shallowProperty('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. var createReduce = function(dir) { // Wrap code that reassigns argument variables in a separate function than // the one that accesses `arguments.length` to avoid a perf hit. (#1991) var reducer = function(obj, iteratee, memo, initial) { var keys = !isArrayLike(obj) && _.keys(obj), length = (keys \|\| obj).length, index = dir > 0 ? 0 : length - 1; if (!initial) { memo = obj[keys ? keys[index] : index]; index += dir; } 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) { var initial = arguments.length >= 3; return reducer(obj, optimizeCb(iteratee, context, 4), memo, initial); }; }; // 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 keyFinder = isArrayLike(obj) ? _.findIndex : _.findKey; var key = keyFinder(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 = restArguments(function(obj, path, args) { var contextPath, func; if (_.isFunction(path)) { func = path; } else if (_.isArray(path)) { contextPath = path.slice(0, -1); path = path[path.length - 1]; } return _.map(obj, function(context) { var method = func; if (!method) { if (contextPath && contextPath.length) { context = deepGet(context, contextPath); } if (context == null) return void 0; method = context[path]; } return method == null ? method : method.apply(context, 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 \|\| typeof iteratee == 'number' && typeof obj[0] != 'object' && obj != null) { obj = isArrayLike(obj) ? obj : _.values(obj); for (var i = 0, length = obj.length; i < length; i++) { value = obj[i]; if (value != null && value > result) { result = value; } } } else { iteratee = cb(iteratee, context); _.each(obj, function(v, index, list) { computed = iteratee(v, index, list); if (computed > lastComputed \|\| computed === -Infinity && result === -Infinity) { result = v; 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 \|\| typeof iteratee == 'number' && typeof obj[0] != 'object' && obj != null) { obj = isArrayLike(obj) ? obj : _.values(obj); for (var i = 0, length = obj.length; i < length; i++) { value = obj[i]; if (value != null && value < result) { result = value; } } } else { iteratee = cb(iteratee, context); _.each(obj, function(v, index, list) { computed = iteratee(v, index, list); if (computed < lastComputed \|\| computed === Infinity && result === Infinity) { result = v; lastComputed = computed; } }); } return result; }; // Shuffle a collection. _.shuffle = function(obj) { return _.sample(obj, Infinity); }; // Sample n random values from a collection using the modern version of the // [Fisher-Yates shuffle](http://en.wikipedia.org/wiki/Fisher–Yates_shuffle). // 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)]; } var sample = isArrayLike(obj) ? _.clone(obj) : _.values(obj); var length = getLength(sample); n = Math.max(Math.min(n, length), 0); var last = length - 1; for (var index = 0; index < n; index++) { var rand = _.random(index, last); var temp = sample[index]; sample[index] = sample[rand]; sample[rand] = temp; } return sample.slice(0, n); }; // Sort the object's values by a criterion produced by an iteratee. _.sortBy = function(obj, iteratee, context) { var index = 0; iteratee = cb(iteratee, context); return _.pluck(_.map(obj, function(value, key, list) { return { value: value, index: index++, criteria: iteratee(value, key, 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, partition) { return function(obj, iteratee, context) { var result = partition ? [[], []] : {}; 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; }); var reStrSymbol = /[^\ud800-\udfff]\|[\ud800-\udbff][\udc00-\udfff]\|[\ud800-\udfff]/g; // Safely create a real, live array from anything iterable. _.toArray = function(obj) { if (!obj) return []; if (_.isArray(obj)) return slice.call(obj); if (_.isString(obj)) { // Keep surrogate pair characters together return obj.match(reStrSymbol); } 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 = group(function(result, value, pass) { result[pass ? 0 : 1].push(value); }, true); // 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 \|\| array.length < 1) return n == null ? 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 \|\| array.length < 1) return n == null ? 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, Boolean); }; // Internal implementation of a recursive `flatten` function. var flatten = function(input, shallow, strict, output) { output = output \|\| []; var idx = output.length; for (var i = 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) { var j = 0, len = value.length; while (j < len) output[idx++] = value[j++]; } else { flatten(value, shallow, strict, output); idx = output.length; } } 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 = restArguments(function(array, otherArrays) { return _.difference(array, otherArrays); }); // Produce a duplicate-free version of the array. If the array has already // been sorted, you have the option of using a faster algorithm. // The faster algorithm will not work with an iteratee if the iteratee // is not a one-to-one function, so providing an iteratee will disable // the 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 && !iteratee) { 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 = restArguments(function(arrays) { return _.uniq(flatten(arrays, 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; var j; for (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 = restArguments(function(array, rest) { rest = flatten(rest, true, true); return _.filter(array, function(value){ return !_.contains(rest, value); }); }); // 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; }; // Zip together multiple lists into a single array -- elements that share // an index go together. _.zip = restArguments(_.unzip); // 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. Passing by pairs is the reverse of _.pairs. _.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. var createPredicateIndexFinder = function(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. var createIndexFinder = function(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; } if (!step) { step = stop < start ? -1 : 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; }; // Chunk a single array into multiple arrays, each containing `count` or fewer // items. _.chunk = function(array, count) { if (count == null \|\| count < 1) return []; var result = []; var i = 0, length = array.length; while (i < length) { result.push(slice.call(array, i, i += count)); } return result; }; // 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 = restArguments(function(func, context, args) { if (!_.isFunction(func)) throw new TypeError('Bind must be called on a function'); var bound = restArguments(function(callArgs) { return executeBound(func, bound, context, this, args.concat(callArgs)); }); 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 by default, allowing any combination of arguments to be // pre-filled. Set `_.partial.placeholder` for a custom placeholder argument. _.partial = restArguments(function(func, boundArgs) { var placeholder = _.partial.placeholder; var bound = function() { var position = 0, length = boundArgs.length; var args = Array(length); for (var i = 0; i < length; i++) { args[i] = boundArgs[i] === placeholder ? arguments[position++] : boundArgs[i]; } while (position < arguments.length) args.push(arguments[position++]); return executeBound(func, bound, this, this, args); }; return bound; }); _.partial.placeholder = _; // 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 = restArguments(function(obj, keys) { keys = flatten(keys, false, false); var index = keys.length; if (index < 1) throw new Error('bindAll must be passed function names'); while (index--) { var key = keys[index]; obj[key] = _.bind(obj[key], 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 = restArguments(function(func, wait, args) { 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 timeout, context, args, result; 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; }; var throttled = 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; }; throttled.cancel = function() { clearTimeout(timeout); previous = 0; timeout = context = args = null; }; return throttled; }; // 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, result; var later = function(context, args) { timeout = null; if (args) result = func.apply(context, args); }; var debounced = restArguments(function(args) { if (timeout) clearTimeout(timeout); if (immediate) { var callNow = !timeout; timeout = setTimeout(later, wait); if (callNow) result = func.apply(this, args); } else { timeout = _.delay(later, wait, this, args); } return result; }); debounced.cancel = function() { clearTimeout(timeout); timeout = null; }; return debounced; }; // 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); _.restArguments = restArguments; // 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']; var collectNonEnumProps = function(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 = {}; for (var index = 0; index < length; index++) { var currentKey = keys[index]; results[currentKey] = iteratee(obj[currentKey], currentKey, obj); } return results; }; // Convert an object into a list of `[key, value]` pairs. // The opposite of _.object. _.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(); }; // An internal function for creating assigner functions. var createAssigner = function(keysFunc, defaults) { return function(obj) { var length = arguments.length; if (defaults) obj = Object(obj); 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 (!defaults \|\| obj[key] === void 0) obj[key] = source[key]; } } return obj; }; }; // 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; } }; // Internal pick helper function to determine if `obj` has key `key`. var keyInObj = function(value, key, obj) { return key in obj; }; // Return a copy of the object only containing the whitelisted properties. _.pick = restArguments(function(obj, keys) { var result = {}, iteratee = keys[0]; if (obj == null) return result; if (_.isFunction(iteratee)) { if (keys.length > 1) iteratee = optimizeCb(iteratee, keys[1]); keys = _.allKeys(obj); } else { iteratee = keyInObj; keys = flatten(keys, false, false); 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 = restArguments(function(obj, keys) { var iteratee = keys[0], context; if (_.isFunction(iteratee)) { iteratee = _.negate(iteratee); if (keys.length > 1) context = keys[1]; } else { keys = _.map(flatten(keys, false, false), 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, deepEq; 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; // `null` or `undefined` only equal to itself (strict comparison). if (a == null \|\| b == null) return false; // `NaN`s are equivalent, but non-reflexive. if (a !== a) return b !== b; // Exhaust primitive checks var type = typeof a; if (type !== 'function' && type !== 'object' && typeof b != 'object') return false; return deepEq(a, b, aStack, bStack); }; // Internal recursive comparison function for `isEqual`. deepEq = function(a, b, aStack, bStack) { // 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; case '[object Symbol]': return SymbolProto.valueOf.call(a) === SymbolProto.valueOf.call(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, isMap, isWeakMap, isSet, isWeakSet. _.each(['Arguments', 'Function', 'String', 'Number', 'Date', 'RegExp', 'Error', 'Symbol', 'Map', 'WeakMap', 'Set', 'WeakSet'], 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), Safari 8 (#1929), and PhantomJS (#2236). var nodelist = root.document && root.document.childNodes; if (typeof /./ != 'function' && typeof Int8Array != 'object' && typeof nodelist != 'function') { _.isFunction = function(obj) { return typeof obj == 'function' \|\| false; }; } // Is a given object a finite number? _.isFinite = function(obj) { return !_.isSymbol(obj) && isFinite(obj) && !isNaN(parseFloat(obj)); }; // Is the given value `NaN`? _.isNaN = function(obj) { return _.isNumber(obj) && isNaN(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, path) { if (!_.isArray(path)) { return has(obj, path); } var length = path.length; for (var i = 0; i < length; i++) { var key = path[i]; if (obj == null \|\| !hasOwnProperty.call(obj, key)) { return false; } obj = obj[key]; } return !!length; }; // 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(){}; // Creates a function that, when passed an object, will traverse that object’s // properties down the given `path`, specified as an array of keys or indexes. _.property = function(path) { if (!_.isArray(path)) { return shallowProperty(path); } return function(obj) { return deepGet(obj, path); }; }; // Generates a function for a given object that returns a given property. _.propertyOf = function(obj) { if (obj == null) { return function(){}; } return function(path) { return !_.isArray(path) ? obj[path] : deepGet(obj, path); }; }; // 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 = { '&': '&', '<': '<', '>': '>', '"': '"', "'": ''', '`': '`' }; 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); // Traverses the children of `obj` along `path`. If a child is a function, it // is invoked with its parent as context. Returns the value of the final // child, or `fallback` if any child is undefined. _.result = function(obj, path, fallback) { if (!_.isArray(path)) path = [path]; var length = path.length; if (!length) { return _.isFunction(fallback) ? fallback.call(obj) : fallback; } for (var i = 0; i < length; i++) { var prop = obj == null ? void 0 : obj[path[i]]; if (prop === void 0) { prop = fallback; i = length; // Ensure we don't continue iterating. } obj = _.isFunction(prop) ? prop.call(obj) : prop; } return obj; }; // 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 escapeRegExp = /\\\|'\|\r\|\n\|\u2028\|\u2029/g; var escapeChar = function(match) { return '\\' + escapes[match]; }; // In order to prevent third-party code injection through // `_.templateSettings.variable`, we test it against the following regular // expression. It is intentionally a bit more liberal than just matching valid // identifiers, but still prevents possible loopholes through defaults or // destructuring assignment. var bareIdentifier = /^\s(\w\|\$)+\s$/; // JavaScript micro-templating, similar to John Resig's implementation. // Underscore templating handles arbitrary delimiters, preserves whitespace, // and correctly escapes quotes within interpolated code. // NB: `oldSettings` only exists for backwards compatibility. _.template = function(text, settings, oldSettings) { if (!settings && oldSettings) settings = oldSettings; settings = _.defaults({}, settings, _.templateSettings); // Combine delimiters into one regular expression via alternation. var matcher = RegExp([ (settings.escape \|\| noMatch).source, (settings.interpolate \|\| noMatch).source, (settings.evaluate \|\| noMatch).source ].join('\|') + '\|$', '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(escapeRegExp, 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 offset. return match; }); source += "';\n"; var argument = settings.variable; if (argument) { // Insure against third-party code injection. if (!bareIdentifier.test(argument)) throw new Error( 'variable is not a bare identifier: ' + argument ); } else { // If a variable is not specified, place data values in local scope. source = 'with(obj\|\|{}){\n' + source + '}\n'; argument = 'obj'; } source = "var __t,__p='',__j=Array.prototype.join," + "print=function(){__p+=__j.call(arguments,'');};\n" + source + 'return __p;\n'; var render; try { render = new Function(argument, '_', 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. 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 chainResult = 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 chainResult(this, func.apply(_, args)); }; }); return _; }; // 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 chainResult(this, obj); }; }); // Add all accessor Array functions to the wrapper. _.each(['concat', 'join', 'slice'], function(name) { var method = ArrayProto[name]; _.prototype[name] = function() { return chainResult(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 String(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 _; }); } }());

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