partition

modelcollection.model([attrs], [options]) Override this property to specify the model class that the collection contains. If defined

shuffle

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

findLastIndex

resetcollection.reset([models], [options]) Adding and removing models one at a time is all well and good, but sometimes you have

first (head, take)

forEach (each)

removecollection.remove(models, [options]) Remove a model (or an array of models) from the collection, and return them. Each model

addcollection.add(models, [options]) Add a model (or an array of models) to the collection, firing an "add" event for