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Ember.NativeArray Class packages/ember-runtime/lib/system/native_array.js:25


PUBLIC

The NativeArray mixin contains the properties needed to make the native Array support Ember.MutableArray and all of its dependent APIs. Unless you have EmberENV.EXTEND_PROTOTYPES or EmberENV.EXTEND_PROTOTYPES.Array set to false, this will be applied automatically. Otherwise you can apply the mixin at anytime by calling Ember.NativeArray.apply(Array.prototype).

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addArrayObserver

(target, opts) Ember.Array public

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.

Parameters:

target Object
The observer object.
opts Object
Optional hash of configuration options including `willChange` and `didChange` option.

Returns:

Ember.Array
receiver

addEnumerableObserver

(target, opts) private

Registers an enumerable observer. Must implement Ember.EnumerableObserver mixin.

Parameters:

target Object
opts [Object]

Returns:

this

addObject

(obj) Ember.Array public

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

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

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

Parameters:

obj *
object to add, if not already present

Returns:

Ember.Array
receiver

addObjects

(objects) Object public

Adds each object in the passed enumerable to the receiver.

Parameters:

objects Ember.Enumerable
the objects to add.

Returns:

Object
receiver

addObserver

(key, target, method) public

Adds an observer on a property.

This is the core method used to register an observer for a property.

Once you call this method, any time the key's value is set, your observer will be notified. Note that the observers are triggered any time the value is set, regardless of whether it has actually changed. Your observer should be prepared to handle that.

Observer Methods

Observer methods have the following signature:

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export default Ember.Component.extend({
  init() {
    this._super(...arguments);
    this.addObserver('foo', this, 'fooDidChange');
  },

  fooDidChange(sender, key, value, rev) {
    // your code
  }
});

The sender is the object that changed. The key is the property that changes. The value property is currently reserved and unused. The rev is the last property revision of the object when it changed, which you can use to detect if the key value has really changed or not.

Usually you will not need the value or revision parameters at the end. In this case, it is common to write observer methods that take only a sender and key value as parameters or, if you aren't interested in any of these values, to write an observer that has no parameters at all.

Parameters:

key String
The key to observe
target Object
The target object to invoke
method String|Function
The method to invoke

any

(callback, target) Boolean public

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

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

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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.

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:

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

Parameters:

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

arrayContentDidChange

(startIdx, removeAmt, addAmt) Ember.Array public

If you are implementing an object that supports Ember.Array, 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.

Parameters:

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:

Ember.Array
receiver

arrayContentWillChange

(startIdx, removeAmt, addAmt) Ember.Array public

If you are implementing an object that supports Ember.Array, 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.

Parameters:

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:

Ember.Array
receiver

beginPropertyChanges

Ember.Observable private

Begins a grouping of property changes.

You can use this method to group property changes so that notifications will not be sent until the changes are finished. If you plan to make a large number of changes to an object at one time, you should call this method at the beginning of the changes to begin deferring change notifications. When you are done making changes, call endPropertyChanges() to deliver the deferred change notifications and end deferring.

Returns:

Ember.Observable

cacheFor

(keyName) Object public

Returns the cached value of a computed property, if it exists. This allows you to inspect the value of a computed property without accidentally invoking it if it is intended to be generated lazily.

Parameters:

keyName String

Returns:

Object
The cached value of the computed property, if any

clear

Ember.Array public

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

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

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

Returns:

Ember.Array
An empty Array.

compact

Array public

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

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

Returns:

Array
the array without null and undefined elements.

contains

(obj) Boolean deprecated public

Returns true if the passed object can be found in the receiver. The default version will iterate through the enumerable until the object is found. You may want to override this with a more efficient version.

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

arr.contains('a'); // true
arr.contains('z'); // false

Parameters:

obj Object
The object to search for.

Returns:

Boolean
`true` if object is found in enumerable.

copy

(deep) Object private

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

Override to return a copy of the receiver. Default implementation raises an exception.

Parameters:

deep Boolean
if `true`, a deep copy of the object should be made

Returns:

Object
copy of receiver

decrementProperty

(keyName, decrement) Number public

Set the value of a property to the current value minus some amount.

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player.decrementProperty('lives');
orc.decrementProperty('health', 5);

Parameters:

keyName String
The name of the property to decrement
decrement Number
The amount to decrement by. Defaults to 1

Returns:

Number
The new property value

endPropertyChanges

Ember.Observable private

Ends a grouping of property changes.

You can use this method to group property changes so that notifications will not be sent until the changes are finished. If you plan to make a large number of changes to an object at one time, you should call beginPropertyChanges() at the beginning of the changes to defer change notifications. When you are done making changes, call this method to deliver the deferred change notifications and end deferring.

Returns:

Ember.Observable

enumerableContentDidChange

(removing, adding) private

Invoke this method when the contents of your enumerable has changed. This will notify any observers watching for content changes. If you are implementing an ordered enumerable (such as an array), also pass the start and end values where the content changed so that it can be used to notify range observers.

Parameters:

removing Ember.Enumerable|Number
An enumerable of the objects to be removed or the number of items to be removed.
adding Ember.Enumerable|Number
An enumerable of the objects to be added or the number of items to be added.

enumerableContentWillChange

(removing, adding) private

Invoke this method just before the contents of your enumerable will change. You can either omit the parameters completely or pass the objects to be removed or added if available or just a count.

Parameters:

removing Ember.Enumerable|Number
An enumerable of the objects to be removed or the number of items to be removed.
adding Ember.Enumerable|Number
An enumerable of the objects to be added or the number of items to be added.

every

(callback, target) Boolean public

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):

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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.

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.

Example Usage:

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

Parameters:

callback Function
The callback to execute
target [Object]
The target object to use

Returns:

Boolean

filter

(callback, target) Array public

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):

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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.

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.

Parameters:

callback Function
The callback to execute
target [Object]
The target object to use

Returns:

Array
A filtered array.

filterBy

(key, value) Array public

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.

Parameters:

key String
the property to test
value [*]
optional value to test against.

Returns:

Array
filtered array

find

(callback, target) Object public

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):

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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.

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.

Parameters:

callback Function
The callback to execute
target [Object]
The target object to use

Returns:

Object
Found item or `undefined`.

findBy

(key, value) Object public

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.

Parameters:

key String
the property to test
value [String]
optional value to test against.

Returns:

Object
found item or `undefined`

forEach

(callback, target) Object public

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):

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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.

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.

Parameters:

callback Function
The callback to execute
target [Object]
The target object to use

Returns:

Object
receiver

frozenCopy

Object deprecated private

Use Object.freeze instead.

If the object implements Ember.Freezable, then this will return a new copy if the object is not frozen and the receiver if the object is frozen.

Raises an exception if you try to call this method on a object that does not support freezing.

You should use this method whenever you want a copy of a freezable object since a freezable object can simply return itself without actually consuming more memory.

Returns:

Object
copy of receiver or receiver

get

(keyName) Object public

Retrieves the value of a property from the object.

This method is usually similar to using object[keyName] or object.keyName, however it supports both computed properties and the unknownProperty handler.

Because get unifies the syntax for accessing all these kinds of properties, it can make many refactorings easier, such as replacing a simple property with a computed property, or vice versa.

Computed Properties

Computed properties are methods defined with the property modifier declared at the end, such as:

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fullName: Ember.computed('firstName', 'lastName', function() {
  return this.get('firstName') + ' ' + this.get('lastName');
})

When you call get on a computed property, the function will be called and the return value will be returned instead of the function itself.

Unknown Properties

Likewise, if you try to call get on a property whose value is undefined, the unknownProperty() method will be called on the object. If this method returns any value other than undefined, it will be returned instead. This allows you to implement "virtual" properties that are not defined upfront.

Parameters:

keyName String
The property to retrieve

Returns:

Object
The property value or undefined.

getEach

(key) Array public

Alias for mapBy

Parameters:

key String
name of the property

Returns:

Array
The mapped array.

getProperties

(list) Object public

To get the values of multiple properties at once, call getProperties with a list of strings or an array:

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record.getProperties('firstName', 'lastName', 'zipCode');
// { firstName: 'John', lastName: 'Doe', zipCode: '10011' }

is equivalent to:

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record.getProperties(['firstName', 'lastName', 'zipCode']);
// { firstName: 'John', lastName: 'Doe', zipCode: '10011' }

Parameters:

list String...|Array
of keys to get

Returns:

Object

getWithDefault

(keyName, defaultValue) Object public

Retrieves the value of a property, or a default value in the case that the property returns undefined.

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person.getWithDefault('lastName', 'Doe');

Parameters:

keyName String
The name of the property to retrieve
defaultValue Object
The value to return if the property value is undefined

Returns:

Object
The property value or the defaultValue.

hasObserverFor

(key) Boolean private

Returns true if the object currently has observers registered for a particular key. You can use this method to potentially defer performing an expensive action until someone begins observing a particular property on the object.

Parameters:

key String
Key to check

Returns:

Boolean

includes

(obj, startAt) Boolean public

Returns true if the passed object can be found in the array. This method is a Polyfill for ES 2016 Array.includes. If no startAt argument is given, the starting location to search is 0. If it's negative, searches from the index of this.length + startAt by asc.

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

Parameters:

obj Object
The object to search for.
startAt Number
optional starting location to search, default 0

Returns:

Boolean
`true` if object is found in the array.

incrementProperty

(keyName, increment) Number public

Set the value of a property to the current value plus some amount.

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person.incrementProperty('age');
team.incrementProperty('score', 2);

Parameters:

keyName String
The name of the property to increment
increment Number
The amount to increment by. Defaults to 1

Returns:

Number
The new property value

indexOf

(object, startAt) Number public

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.

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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

Parameters:

object Object
the item to search for
startAt Number
optional starting location to search, default 0

Returns:

Number
index or -1 if not found

insertAt

(idx, object) Ember.Array public

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

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

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

Parameters:

idx Number
index of insert the object at.
object Object
object to insert

Returns:

Ember.Array
receiver

invoke

(methodName, args) Array public

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

Parameters:

methodName String
the name of the method
args Object...
optional arguments to pass as well.

Returns:

Array
return values from calling invoke.

isAny

(key, value) Boolean public

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.

Parameters:

key String
the property to test
value [String]
optional value to test against. Defaults to `true`

Returns:

Boolean

isEvery

(key, value) Boolean public

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.

Parameters:

key String
the property to test
value [String]
optional value to test against. Defaults to `true`

Returns:

Boolean

lastIndexOf

(object, startAt) Number public

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.

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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

Parameters:

object Object
the item to search for
startAt Number
optional starting location to search, default 0

Returns:

Number
index or -1 if not found

map

(callback, target) Array public

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):

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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.

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.

Parameters:

callback Function
The callback to execute
target [Object]
The target object to use

Returns:

Array
The mapped array.

mapBy

(key) Array public

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

Parameters:

key String
name of the property

Returns:

Array
The mapped array.

nextObject

(index, previousObject, context) Object private

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

Implement this method to make your class enumerable.

This method will be called repeatedly during enumeration. The index value will always begin with 0 and increment monotonically. You don't have to rely on the index value to determine what object to return, but you should always check the value and start from the beginning when you see the requested index is 0.

The previousObject is the object that was returned from the last call to nextObject for the current iteration. This is a useful way to manage iteration if you are tracing a linked list, for example.

Finally the context parameter will always contain a hash you can use as a "scratchpad" to maintain any other state you need in order to iterate properly. The context object is reused and is not reset between iterations so make sure you setup the context with a fresh state whenever the index parameter is 0.

Generally iterators will continue to call nextObject until the index reaches the current length-1. If you run out of data before this time for some reason, you should simply return undefined.

The default implementation of this method simply looks up the index. This works great on any Array-like objects.

Parameters:

index Number
the current index of the iteration
previousObject Object
the value returned by the last call to `nextObject`.
context Object
a context object you can use to maintain state.

Returns:

Object
the next object in the iteration or undefined

notifyPropertyChange

(keyName) Ember.Observable public

Convenience method to call propertyWillChange and propertyDidChange in succession.

Parameters:

keyName String
The property key to be notified about.

Returns:

Ember.Observable

objectAt

(idx) * public

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 Ember.Array. 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.

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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

Parameters:

idx Number
The index of the item to return.

Returns:

*
item at index or undefined

objectsAt

(indexes) Array public

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

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

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

Parameters:

indexes Array
An array of indexes of items to return.

Returns:

Array

popObject

public

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

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

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

Returns:

object

propertyDidChange

(keyName) Ember.Observable private

Notify the observer system that a property has just changed.

Sometimes you need to change a value directly or indirectly without actually calling get() or set() on it. In this case, you can use this method and propertyWillChange() instead. Calling these two methods together will notify all observers that the property has potentially changed value.

Note that you must always call propertyWillChange and propertyDidChange as a pair. If you do not, it may get the property change groups out of order and cause notifications to be delivered more often than you would like.

Parameters:

keyName String
The property key that has just changed.

Returns:

Ember.Observable

propertyWillChange

(keyName) Ember.Observable private

Notify the observer system that a property is about to change.

Sometimes you need to change a value directly or indirectly without actually calling get() or set() on it. In this case, you can use this method and propertyDidChange() instead. Calling these two methods together will notify all observers that the property has potentially changed value.

Note that you must always call propertyWillChange and propertyDidChange as a pair. If you do not, it may get the property change groups out of order and cause notifications to be delivered more often than you would like.

Parameters:

keyName String
The property key that is about to change.

Returns:

Ember.Observable

pushObject

(obj) public

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

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

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

Parameters:

obj *
object to push

Returns:

object same object passed as a param

pushObjects

(objects) Ember.Array public

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

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let colors = ['red'];

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

Parameters:

objects Ember.Enumerable
the objects to add

Returns:

Ember.Array
receiver

reduce

(callback, initialValue, reducerProperty) Object public

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):

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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.

Parameters:

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

Returns:

Object
The reduced value.

reject

(callback, target) Array public

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):

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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.

Parameters:

callback Function
The callback to execute
target [Object]
The target object to use

Returns:

Array
A rejected array.

rejectBy

(key, value) Array public

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.

Parameters:

key String
the property to test
value [String]
optional value to test against.

Returns:

Array
rejected array

removeArrayObserver

(target, opts) Ember.Array public

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.

Parameters:

target Object
The object observing the array.
opts Object
Optional hash of configuration options including `willChange` and `didChange` option.

Returns:

Ember.Array
receiver

removeAt

(start, len) Ember.Array public

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.

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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

Parameters:

start Number
index, start of range
len Number
length of passing range

Returns:

Ember.Array
receiver

removeEnumerableObserver

(target, opts) private

Removes a registered enumerable observer.

Parameters:

target Object
opts [Object]

Returns:

this

removeObject

(obj) Ember.Array public

Remove all occurrences of an object in the array.

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

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

Parameters:

obj *
object to remove

Returns:

Ember.Array
receiver

removeObjects

(objects) Object public

Removes each object in the passed enumerable from the receiver.

Parameters:

objects Ember.Enumerable
the objects to remove

Returns:

Object
receiver

removeObserver

(key, target, method) public

Remove an observer you have previously registered on this object. Pass the same key, target, and method you passed to addObserver() and your target will no longer receive notifications.

Parameters:

key String
The key to observe
target Object
The target object to invoke
method String|Function
The method to invoke

replace

(idx, amt, objects) public

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()

Parameters:

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 Array
An array of zero or more objects that should be inserted into the array at *idx*

reverseObjects

Ember.Array public

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

Returns:

Ember.Array
receiver

set

(keyName, value) Object public

Sets the provided key or path to the value.

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record.set("key", value);

This method is generally very similar to calling object["key"] = value or object.key = value, except that it provides support for computed properties, the setUnknownProperty() method and property observers.

Computed Properties

If you try to set a value on a key that has a computed property handler defined (see the get() method for an example), then set() will call that method, passing both the value and key instead of simply changing the value itself. This is useful for those times when you need to implement a property that is composed of one or more member properties.

Unknown Properties

If you try to set a value on a key that is undefined in the target object, then the setUnknownProperty() handler will be called instead. This gives you an opportunity to implement complex "virtual" properties that are not predefined on the object. If setUnknownProperty() returns undefined, then set() will simply set the value on the object.

Property Observers

In addition to changing the property, set() will also register a property change with the object. Unless you have placed this call inside of a beginPropertyChanges() and endPropertyChanges(), any "local" observers (i.e. observer methods declared on the same object), will be called immediately. Any "remote" observers (i.e. observer methods declared on another object) will be placed in a queue and called at a later time in a coalesced manner.

Parameters:

keyName String
The property to set
value Object
The value to set or `null`.

Returns:

Object
The passed value

setEach

(key, value) Object public

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.

Parameters:

key String
The key to set
value Object
The object to set

Returns:

Object
receiver

setObjects

(objects) Ember.Array public

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

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

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

Parameters:

objects Ember.Array
array whose content will be used for replacing the content of the receiver

Returns:

Ember.Array
receiver with the new content

setProperties

(hash) Object public

Sets a list of properties at once. These properties are set inside a single beginPropertyChanges and endPropertyChanges batch, so observers will be buffered.

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record.setProperties({ firstName: 'Charles', lastName: 'Jolley' });

Parameters:

hash Object
the hash of keys and values to set

Returns:

Object
The passed in hash

shiftObject

public

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

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

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

Returns:

object

slice

(beginIndex, endIndex) Array public

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.

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

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

Parameters:

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

sortBy

(property) Array public

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.

Parameters:

property String
name(s) to sort on

Returns:

Array
The sorted array.

toArray

Array public

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

Returns:

Array
the enumerable as an array.

toggleProperty

(keyName) Boolean public

Set the value of a boolean property to the opposite of its current value.

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starship.toggleProperty('warpDriveEngaged');

Parameters:

keyName String
The name of the property to toggle

Returns:

Boolean
The new property value

uniq

Ember.Enumerable public

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

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

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

Returns:

Ember.Enumerable

uniqBy

Ember.Enumerable public

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

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

Returns:

Ember.Enumerable

unshiftObject

(obj) public

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

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let colors = ['red'];

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

Parameters:

obj *
object to unshift

Returns:

object same object passed as a param

unshiftObjects

(objects) Ember.Array public

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

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let colors = ['red'];

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

Parameters:

objects Ember.Enumerable
the objects to add

Returns:

Ember.Array
receiver

willMergeMixin

private

without

(value) Ember.Enumerable public

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.

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

Parameters:

value Object

Returns:

Ember.Enumerable
Show:

@each

public

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(){
  ...
});

[]

public

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.

Returns:

this

firstObject

Object public

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

Returns:

Object
the object or undefined

hasArrayObservers

Boolean public

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

hasEnumerableObservers

Boolean private

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

lastObject

Object public

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

Returns:

Object
the last object or undefined

length

Number public

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.