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BackboneJS - Collection Slice
Description
It returns the shallow copy of the elements from the collection model.
Syntax
collection.slice(begin, end)
Parameters
begin − It specifies where to begin the extraction of elements.
end − It specifies where to end the extraction of elements.
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"> var City = Backbone.Model.extend(); //The variable "Cities" contains the elements which are to be displayed when 'slice()' method is called var Cities = ['NewYork', 'Sydney', 'Durban', 'Lancashire', 'Kent']; //The collection instance "cities" uses the "Cities" variable to represent the model elements in //the collection var cities = new Backbone.Collection (Cities, { model:City }); //The slice(1,4) method begins the element extraction at index "1" and ends the extraction of elements //up to the index "4" var mycity = Cities.slice(1,4); //The 'length' property specifies the total number of sliced elements between 1 and 4 document.write("Number of Cities:", +mycity.length); document.write("<br>"); document.write(JSON.stringify(mycity)); </script> </body> </html>
Output
Let us carry out the following steps to see how the above code works −
Save the above code in the slice.htm file.
Open this HTML file in a browser.
backbonejs_collection.htm
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