Map
Ember.Map Class
PRIVATE
Defined in: packages/ember-metal/lib/map.js:221
Module: ember-metal
A Map stores values indexed by keys. Unlike JavaScript's default Objects, the keys of a Map can be any JavaScript object.
Internally, a Map has two data structures:
-
keys: an OrderedSet of all of the existing keys -
values: a JavaScript Object indexed by theEmber.guidFor(key)
When a key/value pair is added for the first time, we add the key to the keys OrderedSet, and create or replace an entry in values. When an entry is deleted, we delete its entry in keys and values.
clearprivate
copyEmber.Mapprivate
Returns:
createprivatestatic
delete (key) Booleanprivate
Removes a value from the map for an associated key.
Parameters:
-
key
*
Returns:
-
Boolean - true if an item was removed, false otherwise
forEach (callback, self) private
Iterate over all the keys and values. Calls the function once for each key, passing in value, key, and the map being iterated over, in that order.
The keys are guaranteed to be iterated over in insertion order.
Parameters:
-
callback
Function -
self
* - if passed, the `this` value inside the callback. By default, `this` is the map.
get (key) *private
Retrieve the value associated with a given key.
Parameters:
-
key
*
Returns:
-
* - the value associated with the key, or `undefined`
has (key) Booleanprivate
Check whether a key is present.
Parameters:
-
key
*
Returns:
-
Boolean - true if the item was present, false otherwise
set (key, value) Ember.Mapprivate
Adds a value to the map. If a value for the given key has already been provided, the new value will replace the old value.
Parameters:
-
key
* -
value
*
Returns:
sizenumberprivate
This property will change as the number of objects in the map changes.
Default: 0
© 2017 Yehuda Katz, Tom Dale and Ember.js contributors
Licensed under the MIT License.
https://emberjs.com/api/classes/Ember.Map.html
