Just using plain JavaScript, this has been answered already: remove objects from array by object property. Using underscore.js, you could combine .findWhere with .without: var arr = [{ id: 1, name: ‘a’ }, { id: 2, name: ‘b’ }, { id: 3, name: ‘c’ }]; //substract third arr = _.without(arr, _.findWhere(arr, { id: 3 })); … Read more
As of today (April 30, 2012) you can use Underscore as usual on your Node.js code. Previous comments are right pointing that REPL interface (Node’s command line mode) uses the “_” to hold the last result BUT on you are free to use it on your code files and it will work without a problem … Read more
With Underscore Underscore provides a function _.mapObject to map the values and preserve the keys. _.mapObject({ one: 1, two: 2, three: 3 }, function (v) { return v * 3; }); // => { one: 3, two: 6, three: 9 } DEMO With Lodash Lodash provides a function _.mapValues to map the values and preserve … Read more
http://www.cdnjs.com hosts a lot of less popular JavaScript frameworks, including: backbone.js: //cdnjs.cloudflare.com/ajax/libs/backbone.js/1.0.0/backbone-min.js (HTTP | HTTPS) underscore.js: //cdnjs.cloudflare.com/ajax/libs/underscore.js/1.5.2/underscore-min.js (HTTP | HTTPS) For convenience, here are the script tags: Backbone.js <script type=”text/javascript” src=”https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.0.0/backbone-min.js”></script> Underscore.js <script src=”https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.5.2/underscore-min.js”></script>
The context parameter just sets the value of this in the iterator function. var someOtherArray = [“name”,”patrick”,”d”,”w”]; _.each([1, 2, 3], function(num) { // In here, “this” refers to the same Array as “someOtherArray” alert( this[num] ); // num is the value from the array being iterated // so this[num] gets the item at the “num” … Read more
RequireJS 2.X now organically addresses non-AMD modules such as Backbone & Underscore much better, using the new shim configuration. The shim configuration is simple to use: (1) one states the dependencies (deps), if any, (which may be from the paths configuration, or may be valid paths themselves). (2) (optionally) specify the global variable name from … Read more
You can use .sortBy, it will always return an ascending list: _.sortBy([2, 3, 1], function(num) { return num; }); // [1, 2, 3] But you can use the .reverse method to get it descending: var array = _.sortBy([2, 3, 1], function(num) { return num; }); console.log(array); // [1, 2, 3] console.log(array.reverse()); // [3, 2, 1] … Read more
Use Array.prototype.map() Results.map(obj => ({ …obj, Active: ‘false’ })) Read the documentation for more information.
You can’t break from the each method—it emulates the native forEach method’s behavior, and the native forEach doesn’t provide to escape the loop (other than throwing an exception). However, all hope is not lost! You can use the Array.every method. đŸ™‚ From that link: every executes the provided callback function once for each element present … Read more
This should do the trick: <% if (typeof(date) !== “undefined”) { %> <span class=”date”><%= date %></span> <% } %> Remember that in underscore.js templates if and for are just standard javascript syntax wrapped in <% %> tags.