underscore.js

问题 I have an array with keys like so: ['asdf12','39342aa','12399','129asg',...] and a collection which has these keys in each object like so: [{guid: '39342aa', name: 'John'},{guid: '129asg', name: 'Mary'}, ... ] Is there a fast way to sort the collection based on the order of keys in the first array? 回答1: var sortedCollection = _.sortBy(collection, function(item){ return firstArray.indexOf(item.guid) }); 回答2: Input: var data1 = ['129asg', '39342aa']; var data2 = [{ guid: '39342aa', name: 'John'

问题 Let me show what I need first so you can understand my problem. I have a contact view like: ContactView = Backbone.View.extend({ template: _.template("Name: <%= name %> E-mail: <%= email %> Phones <%= label1 %> - <%= number1 %> <%= label2 %> - <%= number2 %>"), render: function() { var contact = this.template(this.model.toJSON()); this.$el.html(contact); } }); So far so good, the problem is that the phones part is a list, my model holds an array of phones, and I need to put it dynamically in

问题 I am using wordpress as a backend for an app and I want to use infinite scroll but I am having trouble concatenating articles. I am calling the service using a factory: .factory('Worlds', function ($http) { var worlds = []; storageKey = "worlds"; function _getCache() { var cache = localStorage.getItem(storageKey ); if (cache) worlds = angular.fromJson(cache); } return { all: function () { return $http.get("http://www.examplesite.com/tna_wp/wp-json/posts?filter[category_name]=international

问题 Is there an elegant, functional way to turn this array: [ 1, 5, 9, 21 ] into this [ [1, 5], [5, 9], [9, 21] ] I know I could forEach the array and collect the values to create a new array. Is there an elegant way to do that in _.lodash without using a forEach ? 回答1: You could map a spliced array and check the index. If it is not zero, take the predecessor, otherwise the first element of the original array. var array = [1, 5, 9, 21], result = array.slice(1).map((a, i, aa) => [i ? aa[i - 1] :

问题 I have an array of objects as shown below (although the example below has just one element in the array) [ { "uptime":0, "load":{"x":0.11,"y":0.22,"z":0.33}, "cpu":[ {"u":111,"n":112,"s":113,"i":114,"q":115}, {"u":211,"n":212,"s":213,"i":214,"q":215} ] } ] Im trying to flatten out each element using underscore.js, so the overall array looks like this: [ { "uptime":0, "load_x": 0.11 "load_y": 0.03 "load_z": 0.01, "cpu1_u": 111, "cpu1_n": 112, "cpu1_s": 113, "cpu1_i": 114, "cpu1_q": 115, "cpu2

问题 This question already has answers here : Return void(0); vs return; interrupting functions [duplicate] (2 answers) Closed 6 years ago . I'm studying the annotated source code of Underscore.js. http://underscorejs.org/docs/underscore.html#section-41 Here's the _.first method: _.first = _.head = _.take = function(array, n, guard) { if (array == null) return void 0; return (n == null) || guard ? array[0] : slice.call(array, 0, n); }; Question: Why 'return void 0;' and not just 'return;' ? As far

问题 This question already has answers here : Return void(0); vs return; interrupting functions [duplicate] (2 answers) Closed 6 years ago . I'm studying the annotated source code of Underscore.js. http://underscorejs.org/docs/underscore.html#section-41 Here's the _.first method: _.first = _.head = _.take = function(array, n, guard) { if (array == null) return void 0; return (n == null) || guard ? array[0] : slice.call(array, 0, n); }; Question: Why 'return void 0;' and not just 'return;' ? As far

问题 Sample Code: this.books = this.getBooksFromDatabase(); this.publishedBooks = this.books.filter(function(book) { return book.get("isPublished") === "1"; }); Here lies the problem: this.books.filter, returns an array of the models. I've tried wrapping the array, as such: var publishedBooks = _( this.books.filter(function(book) { return book.get("isPublished") === "1"; })) as recommended by this post: https://github.com/documentcloud/backbone/issues/120 But i still can't run things like:

问题 I'm trying to debounce a function using Lodash, and while it's invoking the function, it doesn't seem to debounce it at all. My issue doesn't seem to be the same mistake as what I've seen elsewhere on SO or Google (generally, that they're not invoking the function that _.debounce returns). My currently super-simple implementation is as follows (in Angular with CoffeeScript): s.search = -> _.debounce( s._makeSearchRequest, 1000 )() s._makeSearchRequest = -> console.log("making search request")

问题 I'm trying to compare two objects with underscore. Object 1 (Filter) { "tuxedoorsuit":"tuxedoorsuit-tuxedo", "occasions":"occasions-wedding" } Object 2 (Properties) { "tuxedoorsuit":"tuxedoorsuit-tuxedo", "occasions":"occasions-wedding", "occasions":"occasions-prom", "product_fit":"product_fit-slim", "colorfamily":"colorfamily-black" } I want to return true when all items of Object 1 are found within Object 2. What would be the best underscore method to use for this? 回答1: Edit: As per Arnaldo