The biggest problem while writing JavaScript applications is the spaghetti code that one needs to write just for HTML DOM manipulation. It returns true if there are no values in the list.In this article, we will try to look at the View classes in Backbone.js and see how view classes help us in updating the relevant parts of the application easily. It returns last occurrence of the value in the array or returns -1, if it is not found. It returns value if it found at specified index or returns -1, if it is not found. It returns values of all instances which are removed in the list. It defines rest of the elements in the array. It specifies the last element of the array in the list. It returns everything, but specifies the last entry of the array in the list. It specifies the first element of the array in the list. It defines the number of values in the list. It divides the collection values into sets, grouped by using iteratee in the list. It returns the sorted elements in ascending order by using iteratee in the list. It specifies the minimum value in the list. It specifies the maximum value in the list. It invokes the method name using method name() on each value in the list. It returns true, if value present in the list. It returns true, if elements in the list pass the predicted values. It returns the rejected elements in the list which doesn't pass the predicted values. It filters each value and returns the array of values which passes the predicate or test. It finds each value and returns the first one which passes the predicate or test. It is right associative version of reduce. It is used to reduce list of values into single value. It maps each value and displays them in a new array of values using iteratee function. It iterates each of the elements in the collection using iteratee function. The following table specifies underscore.js methods which provide their functionality to be used on the Backbone.Collection. It creates new instance of the model in the collection. It uses the sync method to extract data from the model in the collection. It is used to return the shallow copy of the specified object. It returns the collection's data by passing through the response object and represents the data in JSON format. It creates an instance of the collection and returns where resource is located. It is used to return the model that matches the specified attribute in the collection. It is used to display the model by using the matched attribute in the collection. It is used to retrieve the attributes from the model in the collection. it also uses comparator property in order to sort the items. It is used to sort the items in the collection. It is used to count the number of models in the collection. It is used to display the shallow copy of the elements from the collection model. It is used to remove the first item from the collection. It is used to add specified model at the beginning of a collection. It is similar to remove() method which takes array of models and remove the models from the collection. It is similar to add() method which takes array of models and push the models to the collection. It is used to retrieve the model form a collection by using specified index. It is used to retrieve the model from a collection by using id or Cid. If any new model is found, the items will be added to that model. It is used to update the collection with set of items in a model. It resets the collection and populates with new array of models or empty the entire collection. It removes a model or array of models from the collection. It is used to add a model or array of models to the collection. It specifies the state of the model and uses backbone.sync to display the state of the collection. It returns the copy of the attributes of a model using JSON format in the collection. It specifies the array of models which are created inside of the collection. Initialize function is defined to create a model instance. You need to override the model property of the collection class. It is used to extend the backbone's collection class to create an own collection. It facilitates you to listen for changes to specific attributes in any model in a collection.įollowing is a list of methods that can be used to manipulate the Backbone.js collection: Index If an event is triggered on a model in a collection then this will also be triggered on the collection directly. You can create your own collection by extending the backbone's collection class. It provides helper functions to perform aggregation and computation against a list of models. It handles the loading and saving of new models to the server. It is used to deal with a group of related models. A collection is an ordered set of models.
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