Class MutableArray

public

This mixin defines the API for modifying array-like objects. These methods can be applied only to a collection that keeps its items in an ordered set. It builds upon the Array mixin and adds methods to modify the array. One concrete implementations of this class include ArrayProxy.

It is important to use the methods in this class to modify arrays so that changes are observable. This allows the binding system in Ember to function correctly.

Note that an Array can change even if it does not implement this mixin. For example, one might implement a SparseArray that cannot be directly modified, but if its underlying enumerable changes, it will change also.

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Module: @ember/array

Returns a special object that can be used to observe individual properties on the array. Just get an equivalent property on this object and it will return an enumerable that maps automatically to the named key on the member objects.

@each should only be used in a non-terminal context. Example:

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myMethod: computed('posts.@each.author', function(){
  ...
});

If you merely want to watch for the array being changed, like an object being replaced, added or removed, use [] instead of @each.

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myMethod: computed('posts.[]', function(){
  ...
});
Module: @ember/array
returns
this

This is the handler for the special array content property. If you get this property, it will return this. If you set this property to a new array, it will replace the current content.

This property overrides the default property defined in Ember.Enumerable.

Module: @ember/array
returns
Object
the object or undefined

Helper method returns the first object from a collection. This is usually used by bindings and other parts of the framework to extract a single object if the enumerable contains only one item.

If you override this method, you should implement it so that it will always return the same value each time it is called. If your enumerable contains only one object, this method should always return that object. If your enumerable is empty, this method should return undefined.

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let arr = ['a', 'b', 'c'];
arr.get('firstObject');  // 'a'

let arr = [];
arr.get('firstObject');  // undefined
Module: @ember/array

Becomes true whenever the array currently has observers watching changes on the array.

Module: @ember/array
returns
Object
the last object or undefined

Helper method returns the last object from a collection. If your enumerable contains only one object, this method should always return that object. If your enumerable is empty, this method should return undefined.

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let arr = ['a', 'b', 'c'];
arr.get('lastObject');  // 'c'

let arr = [];
arr.get('lastObject');  // undefined
Module: @ember/array

Required. You must implement this method to apply this mixin.

Your array must support the length property. Your replace methods should set this property whenever it changes.