partition

groupBy

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

findLastIndex

initial

fetchcollection.fetch([options]) Fetch the default set of models for this collection from the server,

isEmpty

shuffle

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

comparatorcollection.comparator By default there is no comparator for a collection. If you define a comparator, it will be