Class EmberArray

addArrayObserver (target, opts) EmberArray public

Defined in 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.

any (callback, target) Boolean public

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

Defined in 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

Defined in 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.

compact Array public

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

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.

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:

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

filter (callback, target) Array public

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.

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.

filterBy (key, value) Array public

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

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.

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.

findBy (key, value) Object public

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

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.

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.

getEach (key) Array public

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, startAt) Boolean public

Defined in packages/ember-runtime/lib/mixins/array.js:548

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.

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.

[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

indexOf (object, startAt) Number public

Defined in 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

invoke (methodName, args) Array public

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

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

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

Defined in 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

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.

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.

mapBy (key) Array public

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

Defined in 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

Defined in 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]

reduce (callback, initialValue, reducerProperty) Object public

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

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

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

Defined in 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.

setEach (key, value) Object public

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.

slice (beginIndex, endIndex) Array public

Defined in 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

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

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

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

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' }]

without (value) Ember.Enumerable public

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']