Class MutableArray public

Uses: Ember.MutableEnumerable , EmberArray

Defined in: packages/ember-runtime/lib/mixins/mutable_array.js:39

import MutableArray from '@ember/array/mutable';

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.

Methods

addArrayObserver (target, opts) : EmberArray public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:453

target: Object; The observer object.
opts: Object; Optional hash of configuration options including willChange and didChange option.
returns: EmberArray; receiver

Adds an array observer to the receiving array. The array observer object normally must implement two methods:

arrayWillChange(observedObj, start, removeCount, addCount) - This method will be called just before the array is modified.
arrayDidChange(observedObj, start, removeCount, addCount) - This method will be called just after the array is modified.

Both callbacks will be passed the observed object, starting index of the change as well as a count of the items to be removed and added. You can use these callbacks to optionally inspect the array during the change, clear caches, or do any other bookkeeping necessary.

In addition to passing a target, you can also include an options hash which you can use to override the method names that will be invoked on the target.

addObject (obj) : EmberArray public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:371

obj: *; object to add, if not already present
returns: EmberArray; receiver

Push the object onto the end of the array if it is not already present in the array.

let cities = ['Chicago', 'Berlin'];

cities.addObject('Lima');    // ['Chicago', 'Berlin', 'Lima']
cities.addObject('Berlin');  // ['Chicago', 'Berlin', 'Lima']

addObjects (objects) : Object public

Module: @ember/array

Inherited from Ember.MutableEnumerable packages/ember-runtime/lib/mixins/mutable_enumerable.js:71

objects: Ember.Enumerable; the objects to add.
returns: Object; receiver

Adds each object in the passed enumerable to the receiver.

any (callback, target) : Boolean public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:614

callback: Function; The callback to execute
target: Object; The target object to use
returns: Boolean; true if the passed function returns true for any item

Returns true if the passed function returns true for any item in the enumeration.

The callback method you provide should have the following signature (all parameters are optional):

function(item, index, enumerable);

item is the current item in the iteration.
index is the current index in the iteration.
enumerable is the enumerable object itself.

It must return a truthy value (i.e. true) to include an item in the results. Any non-truthy return value will discard the item from the results.

Note that in addition to a callback, you can also pass an optional target object that will be set as this on the context. This is a good way to give your iterator function access to the current object.

Usage Example:

if (people.any(isManager)) {
  Paychecks.addBiggerBonus();
}

arrayContentDidChange (startIdx, removeAmt, addAmt) : EmberArray public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:529

startIdx: Number; The starting index in the array that did change.
removeAmt: Number; The number of items that were removed. If you pass null assumes 0
addAmt: Number; The number of items that were added. If you pass null assumes 0.
returns: EmberArray; receiver

If you are implementing an object that supports EmberArray, call this method just after the array content changes to notify any observers and invalidate any related properties. Pass the starting index of the change as well as a delta of the amounts to change.

arrayContentWillChange (startIdx, removeAmt, addAmt) : EmberArray public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:510

startIdx: Number; The starting index in the array that will change.
removeAmt: Number; The number of items that will be removed. If you pass null assumes 0
addAmt: Number; The number of items that will be added. If you pass null assumes 0.
returns: EmberArray; receiver

If you are implementing an object that supports EmberArray, call this method just before the array content changes to notify any observers and invalidate any related properties. Pass the starting index of the change as well as a delta of the amounts to change.

clear : Ember.Array public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:79

returns: Ember.Array; An empty Array.

Remove all elements from the array. This is useful if you want to reuse an existing array without having to recreate it.

let colors = ['red', 'green', 'blue'];

colors.length;  // 3
colors.clear(); // []
colors.length;  // 0

compact : Array public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:778

returns: Array; the array without null and undefined elements.

Returns a copy of the array with all null and undefined elements removed.

let arr = ['a', null, 'c', undefined];
arr.compact();  // ['a', 'c']

every (callback, target) : Boolean public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:554

callback: Function; The callback to execute
target: Object; The target object to use
returns: Boolean

Returns true if the passed function returns true for every item in the enumeration. This corresponds with the every() method in JavaScript 1.6.

The callback method you provide should have the following signature (all parameters are optional):

function(item, index, enumerable);

item is the current item in the iteration.
index is the current index in the iteration.
enumerable is the enumerable object itself.

It should return the true or false.

Example Usage:

if (people.every(isEngineer)) {
  Paychecks.addBigBonus();
}

filter (callback, target) : Array public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:365

callback: Function; The callback to execute
target: Object; The target object to use
returns: Array; A filtered array.

Returns an array with all of the items in the enumeration that the passed function returns true for. This method corresponds to filter() defined in JavaScript 1.6.

The callback method you provide should have the following signature (all parameters are optional):

function(item, index, enumerable);

item is the current item in the iteration.
index is the current index in the iteration.
enumerable is the enumerable object itself.

It should return true to include the item in the results, false otherwise.

filterBy (key, value) : Array public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:443

key: String; the property to test
value: *; optional value to test against.
returns: Array; filtered array

Returns an array with just the items with the matched property. You can pass an optional second argument with the target value. Otherwise this will match any property that evaluates to true.

find (callback, target) : Object public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:477

callback: Function; The callback to execute
target: Object; The target object to use
returns: Object; Found item or undefined.

Returns the first item in the array for which the callback returns true. This method works similar to the filter() method defined in JavaScript 1.6 except that it will stop working on the array once a match is found.

The callback method you provide should have the following signature (all parameters are optional):

function(item, index, enumerable);

item is the current item in the iteration.
index is the current index in the iteration.
enumerable is the enumerable object itself.

It should return the true to include the item in the results, false otherwise.

findBy (key, value) : Object public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:537

key: String; the property to test
value: String; optional value to test against.
returns: Object; found item or undefined

Returns the first item with a property matching the passed value. You can pass an optional second argument with the target value. Otherwise this will match any property that evaluates to true.

This method works much like the more generic find() method.

forEach (callback, target) : Object public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:240

callback: Function; The callback to execute
target: Object; The target object to use
returns: Object; receiver

Iterates through the enumerable, calling the passed function on each item. This method corresponds to the forEach() method defined in JavaScript 1.6.

The callback method you provide should have the following signature (all parameters are optional):

function(item, index, enumerable);

item is the current item in the iteration.
index is the current index in the iteration.
enumerable is the enumerable object itself.

getEach (key) : Array public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:289

key: String; name of the property
returns: Array; The mapped array.

Alias for mapBy

includes (obj) : Boolean public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:1112

obj: Object; The object to search for.
returns: Boolean; true if object is found in the enumerable.

Returns true if the passed object can be found in the enumerable.

[1, 2, 3].includes(2);                     // true
[1, 2, 3].includes(4);                     // false
[1, 2, undefined].includes(undefined);     // true
[1, 2, null].includes(null);               // true
[1, 2, NaN].includes(NaN);                 // true

indexOf (object, startAt) : Number public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:363

object: Object; the item to search for
startAt: Number; optional starting location to search, default 0
returns: Number; index or -1 if not found

Returns the index of the given object's first occurrence. If no startAt argument is given, the starting location to search is 0. If it's negative, will count backward from the end of the array. Returns -1 if no match is found.

let arr = ['a', 'b', 'c', 'd', 'a'];

arr.indexOf('a');       //  0
arr.indexOf('z');       // -1
arr.indexOf('a', 2);    //  4
arr.indexOf('a', -1);   //  4
arr.indexOf('b', 3);    // -1
arr.indexOf('a', 100);  // -1

insertAt (idx, object) : EmberArray public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:105

idx: Number; index of insert the object at.
object: Object; object to insert
returns: EmberArray; receiver

This will use the primitive replace() method to insert an object at the specified index.

let colors = ['red', 'green', 'blue'];

colors.insertAt(2, 'yellow');  // ['red', 'green', 'yellow', 'blue']
colors.insertAt(5, 'orange');  // Error: Index out of range

invoke (methodName, args) : Array public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:737

methodName: String; the name of the method
args: Object...; optional arguments to pass as well.
returns: Array; return values from calling invoke.

Invokes the named method on every object in the receiver that implements it. This method corresponds to the implementation in Prototype 1.6.

isAny (key, value) : Boolean public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:675

Available since v1.3.0

key: String; the property to test
value: String; optional value to test against. Defaults to true
returns: Boolean

Returns true if the passed property resolves to the value of the second argument for any item in the enumerable. This method is often simpler/faster than using a callback.

isEvery (key, value) : Boolean public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:595

Available since v1.3.0

key: String; the property to test
value: String; optional value to test against. Defaults to true
returns: Boolean

Returns true if the passed property resolves to the value of the second argument for all items in the enumerable. This method is often simpler/faster than using a callback.

Note that like the native Array.every, isEvery will return true when called on any empty enumerable.

lastIndexOf (object, startAt) : Number public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:406

object: Object; the item to search for
startAt: Number; optional starting location to search, default 0
returns: Number; index or -1 if not found

Returns the index of the given object's last occurrence. If no startAt argument is given, the search starts from the last position. If it's negative, will count backward from the end of the array. Returns -1 if no match is found.

let arr = ['a', 'b', 'c', 'd', 'a'];

arr.lastIndexOf('a');       //  4
arr.lastIndexOf('z');       // -1
arr.lastIndexOf('a', 2);    //  0
arr.lastIndexOf('a', -1);   //  4
arr.lastIndexOf('b', 3);    //  1
arr.lastIndexOf('a', 100);  //  4

map (callback, target) : Array public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:315

callback: Function; The callback to execute
target: Object; The target object to use
returns: Array; The mapped array.

Maps all of the items in the enumeration to another value, returning a new array. This method corresponds to map() defined in JavaScript 1.6.

The callback method you provide should have the following signature (all parameters are optional):

function(item, index, enumerable);

item is the current item in the iteration.
index is the current index in the iteration.
enumerable is the enumerable object itself.

It should return the mapped value.

mapBy (key) : Array public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:352

key: String; name of the property
returns: Array; The mapped array.

Similar to map, this specialized function returns the value of the named property on all items in the enumeration.

objectAt (idx) : * public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:224

idx: Number; The index of the item to return.
returns: *; item at index or undefined

Returns the object at the given index. If the given index is negative or is greater or equal than the array length, returns undefined.

This is one of the primitives you must implement to support EmberArray. If your object supports retrieving the value of an array item using get() (i.e. myArray.get(0)), then you do not need to implement this method yourself.

let arr = ['a', 'b', 'c', 'd'];

arr.objectAt(0);   // 'a'
arr.objectAt(3);   // 'd'
arr.objectAt(-1);  // undefined
arr.objectAt(4);   // undefined
arr.objectAt(5);   // undefined

objectsAt (indexes) : Array public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:256

indexes: Array; An array of indexes of items to return.
returns: Array

This returns the objects at the specified indexes, using objectAt.

let arr = ['a', 'b', 'c', 'd'];

arr.objectsAt([0, 1, 2]);  // ['a', 'b', 'c']
arr.objectsAt([2, 3, 4]);  // ['c', 'd', undefined]

popObject : public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:200

returns: object

Pop object from array or nil if none are left. Works just like pop() but it is KVO-compliant.

let colors = ['red', 'green', 'blue'];

colors.popObject();   // 'blue'
console.log(colors);  // ['red', 'green']

pushObject (obj) : public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:156

obj: *; object to push
returns: object same object passed as a param

Push the object onto the end of the array. Works just like push() but it is KVO-compliant.

let colors = ['red', 'green'];

colors.pushObject('black');     // ['red', 'green', 'black']
colors.pushObject(['yellow']);  // ['red', 'green', ['yellow']]

pushObjects (objects) : EmberArray public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:177

objects: Enumerable; the objects to add
returns: EmberArray; receiver

Add the objects in the passed numerable to the end of the array. Defers notifying observers of the change until all objects are added.

let colors = ['red'];

colors.pushObjects(['yellow', 'orange']);  // ['red', 'yellow', 'orange']

reduce (callback, initialValue, reducerProperty) : Object public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:691

callback: Function; The callback to execute
initialValue: Object; Initial value for the reduce
reducerProperty: String; internal use only.
returns: Object; The reduced value.

This will combine the values of the enumerator into a single value. It is a useful way to collect a summary value from an enumeration. This corresponds to the reduce() method defined in JavaScript 1.8.

The callback method you provide should have the following signature (all parameters are optional):

function(previousValue, item, index, enumerable);

previousValue is the value returned by the last call to the iterator.
item is the current item in the iteration.
index is the current index in the iteration.
enumerable is the enumerable object itself.

Return the new cumulative value.

In addition to the callback you can also pass an initialValue. An error will be raised if you do not pass an initial value and the enumerator is empty.

Note that unlike the other methods, this method does not allow you to pass a target object to set as this for the callback. It's part of the spec. Sorry.

reject (callback, target) : Array public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:408

callback: Function; The callback to execute
target: Object; The target object to use
returns: Array; A rejected array.

Returns an array with all of the items in the enumeration where the passed function returns false. This method is the inverse of filter().

The callback method you provide should have the following signature (all parameters are optional):

function(item, index, enumerable);

item is the current item in the iteration.
index is the current index in the iteration
enumerable is the enumerable object itself.

It should return a falsey value to include the item in the results.

Note that in addition to a callback, you can also pass an optional target object that will be set as "this" on the context. This is a good way to give your iterator function access to the current object.

rejectBy (key, value) : Array public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:458

key: String; the property to test
value: String; optional value to test against.
returns: Array; rejected array

Returns an array with the items that do not have truthy values for key. You can pass an optional second argument with the target value. Otherwise this will match any property that evaluates to false.

removeArrayObserver (target, opts) : EmberArray public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:483

target: Object; The object observing the array.
opts: Object; Optional hash of configuration options including willChange and didChange option.
returns: EmberArray; receiver

Removes an array observer from the object if the observer is current registered. Calling this method multiple times with the same object will have no effect.

removeAt (start, len) : EmberArray public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:131

start: Number; index, start of range
len: Number; length of passing range
returns: EmberArray; receiver

Remove an object at the specified index using the replace() primitive method. You can pass either a single index, or a start and a length.

If you pass a start and length that is beyond the length this method will throw an OUT_OF_RANGE_EXCEPTION.

let colors = ['red', 'green', 'blue', 'yellow', 'orange'];

colors.removeAt(0);     // ['green', 'blue', 'yellow', 'orange']
colors.removeAt(2, 2);  // ['green', 'blue']
colors.removeAt(4, 2);  // Error: Index out of range

removeObject (obj) : EmberArray public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:343

obj: *; object to remove
returns: EmberArray; receiver

Remove all occurrences of an object in the array.

let cities = ['Chicago', 'Berlin', 'Lima', 'Chicago'];

cities.removeObject('Chicago');  // ['Berlin', 'Lima']
cities.removeObject('Lima');     // ['Berlin']
cities.removeObject('Tokyo')     // ['Berlin']

removeObjects (objects) : Object public

Module: @ember/array

Inherited from Ember.MutableEnumerable packages/ember-runtime/lib/mixins/mutable_enumerable.js:104

objects: Ember.Enumerable; the objects to remove
returns: Object; receiver

Removes each object in the passed enumerable from the receiver.

replace (idx, amt, objects) public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:61

idx: Number; Starting index in the array to replace. If idx >= length, then append to the end of the array.
amt: Number; Number of elements that should be removed from the array, starting at idx.
objects: EmberArray; An array of zero or more objects that should be inserted into the array at idx

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

This is one of the primitives you must implement to support Ember.Array. You should replace amt objects started at idx with the objects in the passed array. You should also call this.enumerableContentDidChange()

reverseObjects : EmberArray public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:293

returns: EmberArray; receiver

Reverse objects in the array. Works just like reverse() but it is KVO-compliant.

setEach (key, value) : Object public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:299

key: String; The key to set
value: Object; The object to set
returns: Object; receiver

Sets the value on the named property for each member. This is more ergonomic than using other methods defined on this helper. If the object implements Ember.Observable, the value will be changed to set(), otherwise it will be set directly. null objects are skipped.

setObjects (objects) : EmberArray public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:312

objects: EmberArray; array whose content will be used for replacing the content of the receiver
returns: EmberArray; receiver with the new content

Replace all the receiver's content with content of the argument. If argument is an empty array receiver will be cleared.

let colors = ['red', 'green', 'blue'];

colors.setObjects(['black', 'white']);  // ['black', 'white']
colors.setObjects([]);                  // []

shiftObject : public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:226

returns: object

Shift an object from start of array or nil if none are left. Works just like shift() but it is KVO-compliant.

let colors = ['red', 'green', 'blue'];

colors.shiftObject();  // 'red'
console.log(colors);   // ['green', 'blue']

slice (beginIndex, endIndex) : Array public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:321

beginIndex: Number; (Optional) index to begin slicing from.
endIndex: Number; (Optional) index to end the slice at (but not included).
returns: Array; New array with specified slice

Returns a new array that is a slice of the receiver. This implementation uses the observable array methods to retrieve the objects for the new slice.

let arr = ['red', 'green', 'blue'];

arr.slice(0);       // ['red', 'green', 'blue']
arr.slice(0, 2);    // ['red', 'green']
arr.slice(1, 100);  // ['green', 'blue']

sortBy (property) : Array public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:1052

Available since v1.2.0

property: String; name(s) to sort on
returns: Array; The sorted array.

Converts the enumerable into an array and sorts by the keys specified in the argument.

You may provide multiple arguments to sort by multiple properties.

toArray : Array public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:762

returns: Array; the enumerable as an array.

Simply converts the enumerable into a genuine array. The order is not guaranteed. Corresponds to the method implemented by Prototype.

uniq : Ember.Enumerable public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:826

returns: Ember.Enumerable

Returns a new enumerable that contains only unique values. The default implementation returns an array regardless of the receiver type.

let arr = ['a', 'a', 'b', 'b'];
arr.uniq();  // ['a', 'b']

This only works on primitive data types, e.g. Strings, Numbers, etc.

uniqBy : Ember.Enumerable public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:1083

returns: Ember.Enumerable

Returns a new enumerable that contains only items containing a unique property value. The default implementation returns an array regardless of the receiver type.

let arr = [{ value: 'a' }, { value: 'a' }, { value: 'b' }, { value: 'b' }];
arr.uniqBy('value');  // [{ value: 'a' }, { value: 'b' }]

unshiftObject (obj) : public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:251

obj: *; object to unshift
returns: object same object passed as a param

Unshift an object to start of array. Works just like unshift() but it is KVO-compliant.

let colors = ['red'];

colors.unshiftObject('yellow');    // ['yellow', 'red']
colors.unshiftObject(['black']);   // [['black'], 'yellow', 'red']

unshiftObjects (objects) : EmberArray public

Module: @ember/array

Defined in packages/ember-runtime/lib/mixins/mutable_array.js:272

objects: Enumberable; the objects to add
returns: EmberArray; receiver

Adds the named objects to the beginning of the array. Defers notifying observers until all objects have been added.

let colors = ['red'];

colors.unshiftObjects(['black', 'white']);   // ['black', 'white', 'red']
colors.unshiftObjects('yellow'); // Type Error: 'undefined' is not a function

without (value) : Ember.Enumerable public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:794

value: Object
returns: Ember.Enumerable

Returns a new enumerable that excludes the passed value. The default implementation returns an array regardless of the receiver type. If the receiver does not contain the value it returns the original enumerable.

let arr = ['a', 'b', 'a', 'c'];
arr.without('a');  // ['b', 'c']

Properties

@each public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:595

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:

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.

myMethod: computed('posts.[]', function(){
  ...
});

[] : public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:280

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.

firstObject : Object public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:133

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.

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

let arr = [];
arr.get('firstObject');  // undefined

hasArrayObservers public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:499

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

lastObject : Object public

Module: @ember/array

Inherited from Enumerable packages/ember-runtime/lib/mixins/enumerable.js:170

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.

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

let arr = [];
arr.get('lastObject');  // undefined

length public

Module: @ember/array

Inherited from EmberArray packages/ember-runtime/lib/mixins/array.js:213

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.