     @save()
     model
 
+# Override `Backbone.sync` to use delegate to the model or collection's
+# *localStorage* property, which should be an instance of `Store`.
 Backbone.sync = (method, model, options, error) ->
+  # Backwards compatibility with Backbone <= 0.3.3
   if typeof options is "function"
     options =
       success: options
       error: error
-  resp = undefined
+
   store = model.localStorage or model.collection.localStorage
-  switch method
+
+  resp = switch method
     when "read"
-      resp = (if model.id then store.find(model) else store.findAll())
+      if model.id then store.find(model) else store.findAll()
     when "create"
-      resp = store.create(model)
+      store.create(model)
     when "update"
-      resp = store.update(model)
+      store.update(model)
     when "delete"
-      resp = store.destroy(model)
+      store.destroy(model)
+
   if resp
     options.success resp
   else

S4 = ->
  (((1 + Math.random()) * 0x10000) | 0).toString(16).substring 1

guid = ->
  S4() + S4() + "-" + S4() + "-" + S4() + "-" + S4() + "-" + S4() + S4() + S4()

class window.Store
  constructor: (name) ->
    @name = name
    store = localStorage.getItem(@name)
    @records = (store and store.split(",")) or []

  save: ->
    localStorage.setItem @name, @records.join(",")

  create: (model) ->
    model.id = model.attributes.id = guid()  unless model.id
    localStorage.setItem @name + "-" + model.id, JSON.stringify(model)

    @save()
    model

  # Update a model by replacing its copy in `this.data`.
  update: (model) ->
    localStorage.setItem @name + "-" + model.id, JSON.stringify(model)
    @records.push model.id.toString()  unless _.include(@records, model.id.toString())
    @save()
    model

  # Retrieve a model from `this.data` by id.
  find: (model) ->
    JSON.parse localStorage.getItem(@name + "-" + model.id)

  # Return the array of all models currently in storage.
  findAll: ->
    _.map @records, ((id) ->
      JSON.parse localStorage.getItem(@name + "-" + id)
    ), this

  # Delete a model from `this.data`, returning it.
  destroy: (model) ->
    localStorage.removeItem @name + "-" + model.id
    @records = _.reject(@records, (record_id) ->
