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# Underscore.js
# (c) 2009 Jeremy Ashkenas, DocumentCloud Inc.
# Underscore is freely distributable under the terms of the MIT license.
# Portions of Underscore are inspired by or borrowed from Prototype.js,
# Oliver Steele's Functional, and John Resig's Micro-Templating.
# For all details and documentation:
# http://documentcloud.github.com/underscore/
# ------------------------- Baseline setup ---------------------------------
# Establish the root object, "window" in the browser, or "global" on the server.
root: this
# Save the previous value of the "_" variable.
previousUnderscore: root._
# 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.
wrapper: obj => this._wrapped: obj.
# Establish the object that gets thrown to break out of a loop iteration.
breaker: if typeof(StopIteration) is 'undefined' then '__break__' else StopIteration.
# Create a safe reference to the Underscore object for reference below.
_: root._: obj => new wrapper(obj).
# Export the Underscore object for CommonJS.
if typeof(exports) != 'undefined' then exports._: _.
# Create quick reference variables for speed access to core prototypes.
slice: Array.prototype.slice
unshift: Array.prototype.unshift
toString: Object.prototype.toString
hasOwnProperty: Object.prototype.hasOwnProperty
propertyIsEnumerable: Object.prototype.propertyIsEnumerable
# Current version.
_.VERSION: '0.5.1'
# ------------------------ Collection Functions: ---------------------------
# The cornerstone, an each implementation.
# Handles objects implementing forEach, arrays, and raw objects.
_.each: obj, iterator, context =>
index: 0
try
return obj.forEach(iterator, context) if obj.forEach
return iterator.call(context, item, i, obj) for item, i in obj. if _.isArray(obj) or _.isArguments(obj)
iterator.call(context, obj[key], key, obj) for key in _.keys(obj).
catch e
throw e if e isnt breaker.
obj.
# Return the results of applying the iterator to each element. Use JavaScript
# 1.6's version of map, if possible.
_.map: obj, iterator, context =>
return obj.map(iterator, context) if (obj and _.isFunction(obj.map))
results: []
mapper: value, index, list => results.push(iterator.call(context, value, index, list)).
_.each(obj, mapper)
results.
# Reduce builds up a single result from a list of values. Also known as
# inject, or foldl. Uses JavaScript 1.8's version of reduce, if possible.
_.reduce: obj, memo, iterator, context =>
return obj.reduce(_.bind(iterator, context), memo) if (obj and _.isFunction(obj.reduce))
reducer: value, index, list => memo: iterator.call(context, memo, value, index, list).
_.each(obj, reducer)
memo.
# The right-associative version of reduce, also known as foldr. Uses
# JavaScript 1.8's version of reduceRight, if available.
_.reduceRight: obj, memo, iterator, context =>
return obj.reduceRight(_.bind(iterator, context), memo) if (obj and _.isFunction(obj.reduceRight))
reversed: _.clone(_.toArray(obj)).reverse()
reverser: value, index => memo: iterator.call(context, memo, value, index, obj).
_.each(reversed, reverser)
memo.
# Return the first value which passes a truth test.
_.detect: obj, iterator, context =>
result: null
_.each(obj, (value, index, list =>
if iterator.call(context, value, index, list)
result: value
_.breakLoop()..))
result.
# Return all the elements that pass a truth test. Use JavaScript 1.6's
# filter(), if it exists.
_.select: obj, iterator, context =>
if obj and _.isFunction(obj.filter) then return obj.filter(iterator, context).
results: []
_.each(obj, (value, index, list =>
iterator.call(context, value, index, list) and results.push(value).))
results.
#
# # Return all the elements for which a truth test fails.
# _.reject = function(obj, iterator, context) {
# var results = [];
# _.each(obj, function(value, index, list) {
# !iterator.call(context, value, index, list) && results.push(value);
# });
# return results;
# };
#
# # Determine whether all of the elements match a truth test. Delegate to
# # JavaScript 1.6's every(), if it is present.
# _.all = function(obj, iterator, context) {
# iterator = iterator || _.identity;
# if (obj && _.isFunction(obj.every)) return obj.every(iterator, context);
# var result = true;
# _.each(obj, function(value, index, list) {
# if (!(result = result && iterator.call(context, value, index, list))) _.breakLoop();
# });
# return result;
# };
#
# # Determine if at least one element in the object matches a truth test. Use
# # JavaScript 1.6's some(), if it exists.
# _.any = function(obj, iterator, context) {
# iterator = iterator || _.identity;
# if (obj && _.isFunction(obj.some)) return obj.some(iterator, context);
# var result = false;
# _.each(obj, function(value, index, list) {
# if (result = iterator.call(context, value, index, list)) _.breakLoop();
# });
# return result;
# };
#
# # Determine if a given value is included in the array or object,
# # based on '==='.
# _.include = function(obj, target) {
# if (_.isArray(obj)) return _.indexOf(obj, target) != -1;
# var found = false;
# _.each(obj, function(value) {
# if (found = value === target) _.breakLoop();
# });
# return found;
# };
#
# # Invoke a method with arguments on every item in a collection.
# _.invoke = function(obj, method) {
# var args = _.rest(arguments, 2);
# return _.map(obj, function(value) {
# return (method ? value[method] : value).apply(value, args);
# });
# };
#
# # Convenience version of a common use case of map: fetching a property.
# _.pluck = function(obj, key) {
# return _.map(obj, function(value){ return value[key]; });
# };
#
# # Return the maximum item or (item-based computation).
# _.max = function(obj, iterator, context) {
# if (!iterator && _.isArray(obj)) return Math.max.apply(Math, obj);
# var result = {computed : -Infinity};
# _.each(obj, function(value, index, list) {
# var computed = iterator ? iterator.call(context, value, index, list) : value;
# computed >= result.computed && (result = {value : value, computed : computed});
# });
# return result.value;
# };
#
# # Return the minimum element (or element-based computation).
# _.min = function(obj, iterator, context) {
# if (!iterator && _.isArray(obj)) return Math.min.apply(Math, obj);
# var result = {computed : Infinity};
# _.each(obj, function(value, index, list) {
# var computed = iterator ? iterator.call(context, value, index, list) : value;
# computed < result.computed && (result = {value : value, computed : computed});
# });
# return result.value;
# };
#
# # Sort the object's values by a criteria produced by an iterator.
# _.sortBy = function(obj, iterator, context) {
# return _.pluck(_.map(obj, function(value, index, list) {
# return {
# value : value,
# criteria : iterator.call(context, value, index, list)
# };
# }).sort(function(left, right) {
# var a = left.criteria, b = right.criteria;
# return a < b ? -1 : a > b ? 1 : 0;
# }), 'value');
# };
#
# # Use a comparator function to figure out at what index an object should
# # be inserted so as to maintain order. Uses binary search.
# _.sortedIndex = function(array, obj, iterator) {
# iterator = iterator || _.identity;
# var low = 0, high = array.length;
# while (low < high) {
# var mid = (low + high) >> 1;
# iterator(array[mid]) < iterator(obj) ? low = mid + 1 : high = mid;
# }
# return low;
# };
#
# # Convert anything iterable into a real, live array.
# _.toArray = function(iterable) {
# if (!iterable) return [];
# if (iterable.toArray) return iterable.toArray();
# if (_.isArray(iterable)) return iterable;
# if (_.isArguments(iterable)) return slice.call(iterable);
# return _.map(iterable, function(val){ return val; });
# };
#
# # Return the number of elements in an object.
# _.size = function(obj) {
# return _.toArray(obj).length;
# };
#
# /*-------------------------- Array Functions: ------------------------------*/
#
# # Get the first element of an array. Passing "n" will return the first N
# # values in the array. Aliased as "head". The "guard" check allows it to work
# # with _.map.
# _.first = function(array, n, guard) {
# return n && !guard ? slice.call(array, 0, n) : array[0];
# };
#
# # Returns everything but the first entry of the array. Aliased as "tail".
# # Especially useful on the arguments object. Passing an "index" will return
# # the rest of the values in the array from that index onward. The "guard"
# //check allows it to work with _.map.
# _.rest = function(array, index, guard) {
# return slice.call(array, _.isUndefined(index) || guard ? 1 : index);
# };
#
# # Get the last element of an array.
# _.last = function(array) {
# return array[array.length - 1];
# };
#
# # Trim out all falsy values from an array.
# _.compact = function(array) {
# return _.select(array, function(value){ return !!value; });
# };
#
# # Return a completely flattened version of an array.
# _.flatten = function(array) {
# return _.reduce(array, [], function(memo, value) {
# if (_.isArray(value)) return memo.concat(_.flatten(value));
# memo.push(value);
# return memo;
# });
# };
#
# # Return a version of the array that does not contain the specified value(s).
# _.without = function(array) {
# var values = _.rest(arguments);
# return _.select(array, function(value){ return !_.include(values, value); });
# };
#
# # Produce a duplicate-free version of the array. If the array has already
# # been sorted, you have the option of using a faster algorithm.
# _.uniq = function(array, isSorted) {
# return _.reduce(array, [], function(memo, el, i) {
# if (0 == i || (isSorted === true ? _.last(memo) != el : !_.include(memo, el))) memo.push(el);
# return memo;
# });
# };
#
# # Produce an array that contains every item shared between all the
# # passed-in arrays.
# _.intersect = function(array) {
# var rest = _.rest(arguments);
# return _.select(_.uniq(array), function(item) {
# return _.all(rest, function(other) {
# return _.indexOf(other, item) >= 0;
# });
# });
# };
#
# # Zip together multiple lists into a single array -- elements that share
# # an index go together.
# _.zip = function() {
# var args = _.toArray(arguments);
# var length = _.max(_.pluck(args, 'length'));
# var results = new Array(length);
# for (var i=0; i<length; i++) results[i] = _.pluck(args, String(i));
# return results;
# };
#
# # If the browser doesn't supply us with indexOf (I'm looking at you, MSIE),
# # we need this function. Return the position of the first occurence of an
# # item in an array, or -1 if the item is not included in the array.
# _.indexOf = function(array, item) {
# if (array.indexOf) return array.indexOf(item);
# for (var i=0, l=array.length; i<l; i++) if (array[i] === item) return i;
# return -1;
# };
#
# # Provide JavaScript 1.6's lastIndexOf, delegating to the native function,
# # if possible.
# _.lastIndexOf = function(array, item) {
# if (array.lastIndexOf) return array.lastIndexOf(item);
# var i = array.length;
# while (i--) if (array[i] === item) return i;
# return -1;
# };
#
# # Generate an integer Array containing an arithmetic progression. A port of
# # the native Python range() function. See:
# # http://docs.python.org/library/functions.html#range
# _.range = function(start, stop, step) {
# var a = _.toArray(arguments);
# var solo = a.length <= 1;
# var start = solo ? 0 : a[0], stop = solo ? a[0] : a[1], step = a[2] || 1;
# var len = Math.ceil((stop - start) / step);
# if (len <= 0) return [];
# var range = new Array(len);
# for (var i = start, idx = 0; true; i += step) {
# if ((step > 0 ? i - stop : stop - i) >= 0) return range;
# range[idx++] = i;
# }
# };
#
# /* ----------------------- Function Functions: -----------------------------*/
#
# # Create a function bound to a given object (assigning 'this', and arguments,
# # optionally). Binding with arguments is also known as 'curry'.
# _.bind = function(func, obj) {
# var args = _.rest(arguments, 2);
# return function() {
# return func.apply(obj || root, args.concat(_.toArray(arguments)));
# };
# };
#
# # Bind all of an object's methods to that object. Useful for ensuring that
# # all callbacks defined on an object belong to it.
# _.bindAll = function(obj) {
# var funcs = _.rest(arguments);
# if (funcs.length == 0) funcs = _.functions(obj);
# _.each(funcs, function(f) { obj[f] = _.bind(obj[f], obj); });
# return obj;
# };
#
# # Delays a function for the given number of milliseconds, and then calls
# # it with the arguments supplied.
# _.delay = function(func, wait) {
# var args = _.rest(arguments, 2);
# return setTimeout(function(){ return func.apply(func, args); }, wait);
# };
#
# # Defers a function, scheduling it to run after the current call stack has
# # cleared.
# _.defer = function(func) {
# return _.delay.apply(_, [func, 1].concat(_.rest(arguments)));
# };
#
# # Returns the first function passed as an argument to the second,
# # allowing you to adjust arguments, run code before and after, and
# # conditionally execute the original function.
# _.wrap = function(func, wrapper) {
# return function() {
# var args = [func].concat(_.toArray(arguments));
# return wrapper.apply(wrapper, args);
# };
# };
#
# # Returns a function that is the composition of a list of functions, each
# # consuming the return value of the function that follows.
# _.compose = function() {
# var funcs = _.toArray(arguments);
# return function() {
# var args = _.toArray(arguments);
# for (var i=funcs.length-1; i >= 0; i--) {
# args = [funcs[i].apply(this, args)];
# }
# return args[0];
# };
# };
#
# /* ------------------------- Object Functions: ---------------------------- */
#
# # Retrieve the names of an object's properties.
# _.keys = function(obj) {
# if(_.isArray(obj)) return _.range(0, obj.length);
# var keys = [];
# for (var key in obj) if (hasOwnProperty.call(obj, key)) keys.push(key);
# return keys;
# };
#
# # Retrieve the values of an object's properties.
# _.values = function(obj) {
# return _.map(obj, _.identity);
# };
#
# # Return a sorted list of the function names available in Underscore.
# _.functions = function(obj) {
# return _.select(_.keys(obj), function(key){ return _.isFunction(obj[key]); }).sort();
# };
#
# # Extend a given object with all of the properties in a source object.
# _.extend = function(destination, source) {
# for (var property in source) destination[property] = source[property];
# return destination;
# };
#
# # Create a (shallow-cloned) duplicate of an object.
# _.clone = function(obj) {
# if (_.isArray(obj)) return obj.slice(0);
# return _.extend({}, obj);
# };
#
# # Perform a deep comparison to check if two objects are equal.
# _.isEqual = function(a, b) {
# # Check object identity.
# if (a === b) return true;
# # Different types?
# var atype = typeof(a), btype = typeof(b);
# if (atype != btype) return false;
# # Basic equality test (watch out for coercions).
# if (a == b) return true;
# # One is falsy and the other truthy.
# if ((!a && b) || (a && !b)) return false;
# # One of them implements an isEqual()?
# if (a.isEqual) return a.isEqual(b);
# # Check dates' integer values.
# if (_.isDate(a) && _.isDate(b)) return a.getTime() === b.getTime();
# # Both are NaN?
# if (_.isNaN(a) && _.isNaN(b)) return true;
# # Compare regular expressions.
# if (_.isRegExp(a) && _.isRegExp(b))
# return a.source === b.source &&
# a.global === b.global &&
# a.ignoreCase === b.ignoreCase &&
# a.multiline === b.multiline;
# # If a is not an object by this point, we can't handle it.
# if (atype !== 'object') return false;
# # Check for different array lengths before comparing contents.
# if (a.length && (a.length !== b.length)) return false;
# # Nothing else worked, deep compare the contents.
# var aKeys = _.keys(a), bKeys = _.keys(b);
# # Different object sizes?
# if (aKeys.length != bKeys.length) return false;
# # Recursive comparison of contents.
# for (var key in a) if (!_.isEqual(a[key], b[key])) return false;
# return true;
# };
#
# # Is a given array or object empty?
# _.isEmpty = function(obj) {
# return _.keys(obj).length == 0;
# };
#
# # Is a given value a DOM element?
# _.isElement = function(obj) {
# return !!(obj && obj.nodeType == 1);
# };
#
# # Is a given variable an arguments object?
# _.isArguments = function(obj) {
# return obj && _.isNumber(obj.length) && !_.isArray(obj) && !propertyIsEnumerable.call(obj, 'length');
# };
#
# # Is the given value NaN -- this one is interesting. NaN != NaN, and
# # isNaN(undefined) == true, so we make sure it's a number first.
# _.isNaN = function(obj) {
# return _.isNumber(obj) && isNaN(obj);
# };
#
# # Is a given value equal to null?
# _.isNull = function(obj) {
# return obj === null;
# };
#
# # Is a given variable undefined?
# _.isUndefined = function(obj) {
# return typeof obj == 'undefined';
# };
#
# # 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;
# }
#
# # Define the isArray, isDate, isFunction, isNumber, isRegExp, and isString
# # functions based on their toString identifiers.
# var types = ['Array', 'Date', 'Function', 'Number', 'RegExp', 'String'];
# for (var i=0, l=types.length; i<l; i++) {
# (function() {
# var identifier = '[object ' + types[i] + ']';
# _['is' + types[i]] = function(obj) { return toString.call(obj) == identifier; };
# })();
# }
#
# /* -------------------------- Utility Functions: -------------------------- */
#
# # Run Underscore.js in noConflict mode, returning the '_' variable to its
# # previous owner. Returns a reference to the Underscore object.
# _.noConflict = function() {
# root._ = previousUnderscore;
# return this;
# };
#
# # Keep the identity function around for default iterators.
# _.identity = function(value) {
# return value;
# };
#
# # Break out of the middle of an iteration.
# _.breakLoop = function() {
# throw breaker;
# };
#
# # 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;
# };
#
# # JavaScript templating a-la ERB, pilfered from John Resig's
# # "Secrets of the JavaScript Ninja", page 83.
# _.template = function(str, data) {
# var fn = new Function('obj',
# 'var p=[],print=function(){p.push.apply(p,arguments);};' +
# 'with(obj){p.push(\'' +
# str
# .replace(/[\r\t\n]/g, " ")
# .split("<%").join("\t")
# .replace(/((^|%>)[^\t]*)'/g, "$1\r")
# .replace(/\t=(.*?)%>/g, "',$1,'")
# .split("\t").join("');")
# .split("%>").join("p.push('")
# .split("\r").join("\\'")
# + "');}return p.join('');");
# return data ? fn(data) : fn;
# };
#
# /*------------------------------- Aliases ----------------------------------*/
#
# _.forEach = _.each;
# _.foldl = _.inject = _.reduce;
# _.foldr = _.reduceRight;
# _.filter = _.select;
# _.every = _.all;
# _.some = _.any;
# _.head = _.first;
# _.tail = _.rest;
# _.methods = _.functions;
#
# /*------------------------ Setup the OOP Wrapper: --------------------------*/
#
# # Helper function to continue chaining intermediate results.
# var result = function(obj, chain) {
# return chain ? _(obj).chain() : obj;
# };
#
# # Add all of the Underscore functions to the wrapper object.
# _.each(_.functions(_), function(name) {
# var method = _[name];
# wrapper.prototype[name] = function() {
# unshift.call(arguments, this._wrapped);
# return result(method.apply(_, arguments), this._chain);
# };
# });
#
# # Add all mutator Array functions to the wrapper.
# _.each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {
# var method = Array.prototype[name];
# wrapper.prototype[name] = function() {
# method.apply(this._wrapped, arguments);
# return result(this._wrapped, this._chain);
# };
# });
#
# # Add all accessor Array functions to the wrapper.
# _.each(['concat', 'join', 'slice'], function(name) {
# var method = Array.prototype[name];
# wrapper.prototype[name] = function() {
# return result(method.apply(this._wrapped, arguments), this._chain);
# };
# });
#
# # Start chaining a wrapped Underscore object.
# wrapper.prototype.chain = function() {
# this._chain = true;
# return this;
# };
#
# # Extracts the result from a wrapped and chained object.
# wrapper.prototype.value = function() {
# return this._wrapped;
# };
#
# ()
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