underscore.js

问题 I implemented a mixin to add "or" condition with _.where var arr = [{a:1,b:4}, {a:5}, {a:6}, {a:11}]; _.mixin({ or: function(obj,arr,condition){ return _.chain(arr).where(condition).union(obj).value(); } }); now i can use it like this and it works perfectly somewhat like a sql query _.chain(arr).where({a:1}).or(arr,{a:11,b:3}).or(arr,{a:2}).value(); //returns [{a:1,b:4}] _.chain(arr).where({a:1}).or(arr,{a:11}).or(arr,{a:2}).value(); //returns [{a:1,b:4},{a:11}] _.chain(arr).where({a:1}).or

问题 I can't figure out how to find the intersection of this set of arrays: [ [ {"name":"product1","light":"1"}, {"name":"product2","light":"2"}, {"name":"product5","light":"5"}, {"name":"product4","light":"4"} ], [ {"name":"product2","light":"2"}, {"name":"product3","light":"3"}, {"name":"product4","light":"4"} ],[...more arrays with objects] ] This is just sample data , the real set I have changes a lot but with that structure. I want the returned intersection to look like this (a single array

问题 I have a notifications model for notifications // MODEL NotificationModel = App.BB.Model.extend({ defaults : {} }); // COLLECTION NotificationCollection = App.BB.Collection.extend({ model: NotificationModel, url: '/notifications', initialize : function() { var me = this; me.fetch(); } }); The collection is fetching from the server correctly and has the following fields (id, read) where read is true or false. How can I get the total number count of items that are read == false? ... Unread item

问题 I have a pretty standard Flexslider instance I'm working on. Flexslider incorporates well with the jquery.mousewheel.js plugin, allowing slides to move on mousewheel events. However, Mac OSX and others employ 'intertia' to scrolling effects, making it virtually impossible to scroll only one slide left or right. The general effect is that even the slightest scroll motion in these situations triggers multiple mousewheel events and scrolls the slider multiple images left or right. Obviously,

问题 I'm developing my own functional-programming library, and now referring the underscore . memoize _.memoize(function, [hashFunction]) Memoizes a given function by caching the computed result. Useful for speeding up slow-running computations. If passed an optional hashFunction, it will be used to compute the hash key for storing the result, based on the arguments to the original function. The default hashFunction just uses the first argument to the memoized function as the key. var fibonacci =

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . I am building a node.js app and wondering which javascript lib to add to my repertoire. Current short list includes: Underscore wu

问题 I have the following array of values: [ { id: 1, field: 'map' }, { id: 2, field: 'dog' }, { id: 3, field: 'map' } ] I need to find out elements with field equals dog and map . I know I could use the _.filter method and pass an iterator function, but what I want to know is whether or not there's a better solution to this issue where I could pass search field and possible values . Could someone provide a better way of doing so? EDIT: : I could use the following approach: _.where(array, {field:

问题 I have a multi-line string template in it's own separate js file for use in underscore js. However, no matter how I escape the line breaks I still get an: Uncaught SyntaxError: Unexpected token ILLEGAL On line 1 of the file when it's loaded into the browser. App.Templates['template1'] = '\ <div data-role="page" data-theme="c" id="" data-title="">\ <div data-role="content" class="subnav">\ <table id="day-table" cellpadding="0" cellspacing="0" border="0">\ <thead class="ui-body-a">\ <tr>\ <th>T

问题 My collection looks like this. var list = [{id:'12345', sequence:null}, {id:'12346', sequence:null}, {id:'12347', sequence:null}, {id:'12348', sequence:1}, {id:'12348', sequence:2}, {id:'12349', sequence:1}, {id:'12349', sequence:1}]; I am trying to get a unique list so that object with same id AND sequence will only return one of the objects (we have 2 here- {id:'12349', sequence:1}) my code var uniqueList = _.uniq(list, function(obj) { return obj.id && obj.sequence; }); can we use lodash

问题 My collection looks like this. var list = [{id:'12345', sequence:null}, {id:'12346', sequence:null}, {id:'12347', sequence:null}, {id:'12348', sequence:1}, {id:'12348', sequence:2}, {id:'12349', sequence:1}, {id:'12349', sequence:1}]; I am trying to get a unique list so that object with same id AND sequence will only return one of the objects (we have 2 here- {id:'12349', sequence:1}) my code var uniqueList = _.uniq(list, function(obj) { return obj.id && obj.sequence; }); can we use lodash