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// Underscore.js 1.8.2 // 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 = '1.8.2'; // 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; }; // 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 var MAX_ARRAY_INDEX = Math.pow(2, 53) - 1; var isArrayLike = function(collection) { var length = collection != null && collection.length; 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, predica