"change:[attribute]" (model, value, options) â when a specific attribute has been updated.

lengthcollection.length Like an array, a Collection maintains a length property, counting the number of models it contains

isEmpty

initial

shuffle

first (head, take)

"invalid" (model, error, options) â when a model's validation fails on the client.

defaultsmodel.defaults or model.defaults() The defaults hash (or function) can be used to specify the default attributes for

hasChangedmodel.hasChanged([attribute]) Has the model changed since its last

changedmodel.changed The changed property is the internal hash containing all the attributes that have changed since its last