Ember.Map Class packages/ember-metal/lib/map.js:226
PRIVATE
Defined in: packages/ember-metal/lib/map.js:226
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 keysvalues: 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.
clear
private
create
private
static
delete
(key)
Boolean
private
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)
Boolean
private
Check whether a key is present.
Parameters:
- key *
Returns:
- Boolean
- true if the item was present, false otherwise
size
number
private
This property will change as the number of objects in the map changes.
Default: 0