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BackboneJS - Collection Shift
Description
It removes the first item from the collection.
Syntax
collection.shift(options)
Parameters
options − It includes the model type which will be removed from the collection.
Example
<!DOCTYPE html> <html> <head> <title>Collection Example</title> <script src = "https://code.jquery.com/jquery-2.1.3.min.js" type = "text/javascript"></script> <script src = "https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.2/underscore-min.js" type = "text/javascript"></script> <script src = "https://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.2/backbone-min.js" type = "text/javascript"></script> </head> <body> <script type = "text/javascript"> //'Player' is a model and contains defualt values for the model var Player = Backbone.Model.extend ({ defaults: { name: 'sachin', country: 'india' } }); //'Players' is an instance of the collection var Players = Backbone.Collection.extend ({ model: Player }); //Instantiate the models along with "new" keyword and store them in the collection instance var player1 = new Player({ id: 1, name: 'gayle', country: 'west indies'}); var player2 = new Player({ id: 2, name: 'yuvraj', country: 'india'}); var teamArray = [player1, player2]; document.write("<b>Before using shift method:</b>",JSON.stringify(teamArray)); //The shift() method removes the model 'player1' from the collection teamArray.shift(); //The 'players' is the collection instance and contains array of models var players = new Players(teamArray); document.write("<br><b>After using shift method:</b>",JSON.stringify(players)); </script > </body> </html>
Output
Let us carry out the following steps to see how the above code works −
Save the above code in the shift.htm file.
Open this HTML file in a browser.
backbonejs_collection.htm
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