Class Ember.computed

public

Defined in: packages/ember-metal/lib/computed.js:449

Module: ember

This helper returns a new property descriptor that wraps the passed computed property function. You can use this helper to define properties with mixins or via Ember.defineProperty().

If you pass a function as an argument, it will be used as a getter. A computed property defined in this way might look like this:

        
              let Person = Ember.Object.extend({
  init() {
    this._super(...arguments);

    this.firstName = 'Betty';
    this.lastName = 'Jones';
  },

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

let client = Person.create();

client.get('fullName'); // 'Betty Jones'

client.set('lastName', 'Fuller');
client.get('fullName'); // 'Betty Fuller'

You can pass a hash with two functions, get and set, as an argument to provide both a getter and setter:

        
          
              
              let Person = Ember.Object.extend({
  init() {
    this._super(...arguments);

    this.firstName = 'Betty';
    this.lastName = 'Jones';
  },

  fullName: Ember.computed('firstName', 'lastName', {
    get(key) {
      return `${this.get('firstName')} ${this.get('lastName')}`;
    },
    set(key, value) {
      let [firstName, lastName] = value.split(/\s+/);
      this.setProperties({ firstName, lastName });
      return value;
    }
  })
});

let client = Person.create();
client.get('firstName'); // 'Betty'

client.set('fullName', 'Carroll Fuller');
client.get('firstName'); // 'Carroll'
            

        
      

The set function should accept two parameters, key and value. The value returned from set will be the new value of the property.

Note: This is the preferred way to define computed properties when writing third-party libraries that depend on or use Ember, since there is no guarantee that the user will have prototype Extensions enabled.

The alternative syntax, with prototype extensions, might look like:

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

Show: Inherited Protected Private Deprecated

alias (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:504

dependentKey: String
returns: Ember.ComputedProperty; computed property which creates an alias to the original value for property.

Creates a new property that is an alias for another property on an object. Calls to get or set this property behave as though they were called on the original property.

        
              let Person = Ember.Object.extend({
  name: 'Alex Matchneer',
  nomen: Ember.computed.alias('name')
});

let alex = Person.create();

alex.get('nomen'); // 'Alex Matchneer'
alex.get('name');  // 'Alex Matchneer'

alex.set('nomen', '@machty');
alex.get('name');  // '@machty'

and (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:428

dependentKey: String
returns: Ember.ComputedProperty; computed property which performs a logical `and` on the values of all the original values for properties.

A computed property that performs a logical and on the original values for the provided dependent properties.

You may pass in more than two properties and even use property brace expansion. The computed property will return the first falsy value or last truthy value just like JavaScript's && operator.

Example

        
          
              
              let Hamster = Ember.Object.extend({
  readyForCamp: Ember.computed.and('hasTent', 'hasBackpack'),
  readyForHike: Ember.computed.and('hasWalkingStick', 'hasBackpack')
});

let tomster = Hamster.create();

tomster.get('readyForCamp'); // false
tomster.set('hasTent', true);
tomster.get('readyForCamp'); // false
tomster.set('hasBackpack', true);
tomster.get('readyForCamp'); // true
tomster.set('hasBackpack', 'Yes');
tomster.get('readyForCamp'); // 'Yes'
tomster.set('hasWalkingStick', null);
tomster.get('readyForHike'); // null
            

        
      

bool (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:188

dependentKey: String
returns: Ember.ComputedProperty; computed property which converts to boolean the original value for property

A computed property that converts the provided dependent property into a boolean value.

        
              let Hamster = Ember.Object.extend({
  hasBananas: Ember.computed.bool('numBananas')
});

let hamster = Hamster.create();

hamster.get('hasBananas'); // false
hamster.set('numBananas', 0);
hamster.get('hasBananas'); // false
hamster.set('numBananas', 1);
hamster.get('hasBananas'); // true
hamster.set('numBananas', null);
hamster.get('hasBananas'); // false

collect (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:591

dependentKey: String
returns: Ember.ComputedProperty; computed property which maps values of all passed in properties to an array.

A computed property that returns the array of values for the provided dependent properties.

Example

        
              let Hamster = Ember.Object.extend({
  clothes: Ember.computed.collect('hat', 'shirt')
});

let hamster = Hamster.create();

hamster.get('clothes'); // [null, null]
hamster.set('hat', 'Camp Hat');
hamster.set('shirt', 'Camp Shirt');
hamster.get('clothes'); // ['Camp Hat', 'Camp Shirt']

deprecatingAlias (dependentKey, options) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:620

Available since v1.7.0

dependentKey: String
options: Object; Options for `Ember.deprecate`.
returns: Ember.ComputedProperty; computed property which creates an alias with a deprecation to the original value for property.

Creates a new property that is an alias for another property on an object. Calls to get or set this property behave as though they were called on the original property, but also print a deprecation warning.

        
              let Hamster = Ember.Object.extend({
  bananaCount: Ember.computed.deprecatingAlias('cavendishCount', {
    id: 'hamster.deprecate-banana',
    until: '3.0.0'
  })
});

let hamster = Hamster.create();

hamster.set('bananaCount', 5); // Prints a deprecation warning.
hamster.get('cavendishCount'); // 5

empty (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:58

Available since v1.6.0

dependentKey: String
returns: Ember.ComputedProperty; computed property which negate the original value for property

A computed property that returns true if the value of the dependent property is null, an empty string, empty array, or empty function.

Example

        
              let ToDoList = Ember.Object.extend({
  isDone: Ember.computed.empty('todos')
});

let todoList = ToDoList.create({
  todos: ['Unit Test', 'Documentation', 'Release']
});

todoList.get('isDone'); // false
todoList.get('todos').clear();
todoList.get('isDone'); // true

equal (dependentKey, value) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:258

dependentKey: String
value: String|Number|Object
returns: Ember.ComputedProperty; computed property which returns true if the original value for property is equal to the given value.

A computed property that returns true if the provided dependent property is equal to the given value.

Example

        
              let Hamster = Ember.Object.extend({
  satisfied: Ember.computed.equal('percentCarrotsEaten', 100)
});

let hamster = Hamster.create();

hamster.get('satisfied'); // false
hamster.set('percentCarrotsEaten', 100);
hamster.get('satisfied'); // true
hamster.set('percentCarrotsEaten', 50);
hamster.get('satisfied'); // false

filter (dependentKey, callback) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:250

dependentKey: String
callback: Function
returns: Ember.ComputedProperty; the filtered array

Filters the array by the callback.

The callback method you provide should have the following signature. item is the current item in the iteration. index is the integer index of the current item in the iteration. array is the dependant array itself.

        
              function(item, index, array);

        
          
              
              let Hamster = Ember.Object.extend({
  remainingChores: Ember.computed.filter('chores', function(chore, index, array) {
    return !chore.done;
  })
});

let hamster = Hamster.create({
  chores: [
    { name: 'cook', done: true },
    { name: 'clean', done: true },
    { name: 'write more unit tests', done: false }
  ]
});

hamster.get('remainingChores'); // [{name: 'write more unit tests', done: false}]
            

        
      

You can also use @each.property in your dependent key, the callback will still use the underlying array:

        
          
              
              let Hamster = Ember.Object.extend({
  remainingChores: Ember.computed.filter('chores.@each.done', function(chore, index, array) {
    return !chore.get('done');
  })
});

let hamster = Hamster.create({
  chores: Ember.A([
    Ember.Object.create({ name: 'cook', done: true }),
    Ember.Object.create({ name: 'clean', done: true }),
    Ember.Object.create({ name: 'write more unit tests', done: false })
  ])
});
hamster.get('remainingChores'); // [{name: 'write more unit tests', done: false}]
hamster.get('chores').objectAt(2).set('done', true);
hamster.get('remainingChores'); // []
            

        
      

filterBy (dependentKey, propertyKey, value) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:315

dependentKey: String
propertyKey: String
value: *
returns: Ember.ComputedProperty; the filtered array

Filters the array by the property and value

        
              let Hamster = Ember.Object.extend({
  remainingChores: Ember.computed.filterBy('chores', 'done', false)
});

let hamster = Hamster.create({
  chores: [
    { name: 'cook', done: true },
    { name: 'clean', done: true },
    { name: 'write more unit tests', done: false }
  ]
});

hamster.get('remainingChores'); // [{ name: 'write more unit tests', done: false }]

gt (dependentKey, value) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:292

dependentKey: String
value: Number
returns: Ember.ComputedProperty; computed property which returns true if the original value for property is greater than given value.

A computed property that returns true if the provided dependent property is greater than the provided value.

Example

        
              let Hamster = Ember.Object.extend({
  hasTooManyBananas: Ember.computed.gt('numBananas', 10)
});

let hamster = Hamster.create();

hamster.get('hasTooManyBananas'); // false
hamster.set('numBananas', 3);
hamster.get('hasTooManyBananas'); // false
hamster.set('numBananas', 11);
hamster.get('hasTooManyBananas'); // true

gte (dependentKey, value) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:326

dependentKey: String
value: Number
returns: Ember.ComputedProperty; computed property which returns true if the original value for property is greater or equal then given value.

A computed property that returns true if the provided dependent property is greater than or equal to the provided value.

Example

        
              let Hamster = Ember.Object.extend({
  hasTooManyBananas: Ember.computed.gte('numBananas', 10)
});

let hamster = Hamster.create();

hamster.get('hasTooManyBananas'); // false
hamster.set('numBananas', 3);
hamster.get('hasTooManyBananas'); // false
hamster.set('numBananas', 10);
hamster.get('hasTooManyBananas'); // true

intersect (propertyKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:488

propertyKey: String
returns: Ember.ComputedProperty; computes a new array with all the duplicated elements from the dependent arrays

A computed property which returns a new array with all the elements two or more dependent arrays have in common.

Example

        
              let obj = Ember.Object.extend({
  friendsInCommon: Ember.computed.intersect('adaFriends', 'charlesFriends')
}).create({
  adaFriends: ['Charles Babbage', 'John Hobhouse', 'William King', 'Mary Somerville'],
  charlesFriends: ['William King', 'Mary Somerville', 'Ada Lovelace', 'George Peacock']
});

obj.get('friendsInCommon'); // ['William King', 'Mary Somerville']

lt (dependentKey, value) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:360

dependentKey: String
value: Number
returns: Ember.ComputedProperty; computed property which returns true if the original value for property is less then given value.

A computed property that returns true if the provided dependent property is less than the provided value.

Example

        
              let Hamster = Ember.Object.extend({
  needsMoreBananas: Ember.computed.lt('numBananas', 3)
});

let hamster = Hamster.create();

hamster.get('needsMoreBananas'); // true
hamster.set('numBananas', 3);
hamster.get('needsMoreBananas'); // false
hamster.set('numBananas', 2);
hamster.get('needsMoreBananas'); // true

lte (dependentKey, value) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:394

dependentKey: String
value: Number
returns: Ember.ComputedProperty; computed property which returns true if the original value for property is less or equal than given value.

A computed property that returns true if the provided dependent property is less than or equal to the provided value.

Example

        
              let Hamster = Ember.Object.extend({
  needsMoreBananas: Ember.computed.lte('numBananas', 3)
});

let hamster = Hamster.create();

hamster.get('needsMoreBananas'); // true
hamster.set('numBananas', 5);
hamster.get('needsMoreBananas'); // false
hamster.set('numBananas', 3);
hamster.get('needsMoreBananas'); // true

map (dependentKey, callback) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:170

dependentKey: String
callback: Function
returns: Ember.ComputedProperty; an array mapped via the callback

Returns an array mapped via the callback

The callback method you provide should have the following signature. item is the current item in the iteration. index is the integer index of the current item in the iteration.

        
              function(item, index);

Example

        
              let Hamster = Ember.Object.extend({
  excitingChores: Ember.computed.map('chores', function(chore, index) {
    return chore.toUpperCase() + '!';
  })
});

let hamster = Hamster.create({
  chores: ['clean', 'write more unit tests']
});

hamster.get('excitingChores'); // ['CLEAN!', 'WRITE MORE UNIT TESTS!']

mapBy (dependentKey, propertyKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:210

dependentKey: String
propertyKey: String
returns: Ember.ComputedProperty; an array mapped to the specified key

Returns an array mapped to the specified key.

        
          
              
              let Person = Ember.Object.extend({
  childAges: Ember.computed.mapBy('children', 'age')
});

let lordByron = Person.create({ children: [] });

lordByron.get('childAges'); // []
lordByron.get('children').pushObject({ name: 'Augusta Ada Byron', age: 7 });
lordByron.get('childAges'); // [7]
lordByron.get('children').pushObjects([{
  name: 'Allegra Byron',
  age: 5
}, {
  name: 'Elizabeth Medora Leigh',
  age: 8
}]);
lordByron.get('childAges'); // [7, 5, 8]
            

        
      

match (dependentKey, regexp) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:221

dependentKey: String
regexp: RegExp
returns: Ember.ComputedProperty; computed property which match the original value for property against a given RegExp

A computed property which matches the original value for the dependent property against a given RegExp, returning true if the value matches the RegExp and false if it does not.

Example

        
              let User = Ember.Object.extend({
  hasValidEmail: Ember.computed.match('email', /^.+@.+\..+$/)
});

let user = User.create({loggedIn: false});

user.get('hasValidEmail'); // false
user.set('email', '');
user.get('hasValidEmail'); // false
user.set('email', 'ember_hamster@example.com');
user.get('hasValidEmail'); // true

max (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:80

dependentKey: String
returns: Ember.ComputedProperty; computes the largest value in the dependentKey's array

A computed property that calculates the maximum value in the dependent array. This will return -Infinity when the dependent array is empty.

        
          
              
              let Person = Ember.Object.extend({
  childAges: Ember.computed.mapBy('children', 'age'),
  maxChildAge: Ember.computed.max('childAges')
});

let lordByron = Person.create({ children: [] });

lordByron.get('maxChildAge'); // -Infinity
lordByron.get('children').pushObject({
  name: 'Augusta Ada Byron', age: 7
});
lordByron.get('maxChildAge'); // 7
lordByron.get('children').pushObjects([{
  name: 'Allegra Byron',
  age: 5
}, {
  name: 'Elizabeth Medora Leigh',
  age: 8
}]);
lordByron.get('maxChildAge'); // 8
            

        
      

If the types of the arguments are not numbers, they will be converted to numbers and the type of the return value will always be Number. For example, the max of a list of Date objects will be the highest timestamp as a Number. This behavior is consistent with Math.max.

min (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:125

dependentKey: String
returns: Ember.ComputedProperty; computes the smallest value in the dependentKey's array

A computed property that calculates the minimum value in the dependent array. This will return Infinity when the dependent array is empty.

        
          
              
              let Person = Ember.Object.extend({
  childAges: Ember.computed.mapBy('children', 'age'),
  minChildAge: Ember.computed.min('childAges')
});

let lordByron = Person.create({ children: [] });

lordByron.get('minChildAge'); // Infinity
lordByron.get('children').pushObject({
  name: 'Augusta Ada Byron', age: 7
});
lordByron.get('minChildAge'); // 7
lordByron.get('children').pushObjects([{
  name: 'Allegra Byron',
  age: 5
}, {
  name: 'Elizabeth Medora Leigh',
  age: 8
}]);
lordByron.get('minChildAge'); // 5
            

        
      

If the types of the arguments are not numbers, they will be converted to numbers and the type of the return value will always be Number. For example, the min of a list of Date objects will be the lowest timestamp as a Number. This behavior is consistent with Math.min.

none (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:123

dependentKey: String
returns: Ember.ComputedProperty; computed property which returns true if original value for property is null or undefined.

A computed property that returns true if the value of the dependent property is null or undefined. This avoids errors from JSLint complaining about use of ==, which can be technically confusing.

Example

        
              let Hamster = Ember.Object.extend({
  isHungry: Ember.computed.none('food')
});

let hamster = Hamster.create();

hamster.get('isHungry'); // true
hamster.set('food', 'Banana');
hamster.get('isHungry'); // false
hamster.set('food', null);
hamster.get('isHungry'); // true

not (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:157

dependentKey: String
returns: Ember.ComputedProperty; computed property which returns inverse of the original value for property

A computed property that returns the inverse boolean value of the original value for the dependent property.

Example

        
              let User = Ember.Object.extend({
  isAnonymous: Ember.computed.not('loggedIn')
});

let user = User.create({loggedIn: false});

user.get('isAnonymous'); // true
user.set('loggedIn', true);
user.get('isAnonymous'); // false

notEmpty (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:92

dependentKey: String
returns: Ember.ComputedProperty; computed property which returns true if original value for property is not empty.

A computed property that returns true if the value of the dependent property is NOT null, an empty string, empty array, or empty function.

Example

        
              let Hamster = Ember.Object.extend({
  hasStuff: Ember.computed.notEmpty('backpack')
});

let hamster = Hamster.create({ backpack: ['Food', 'Sleeping Bag', 'Tent'] });

hamster.get('hasStuff');         // true
hamster.get('backpack').clear(); // []
hamster.get('hasStuff');         // false

oneWay (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:532

dependentKey: String
returns: Ember.ComputedProperty; computed property which creates a one way computed property to the original value for property.

Where computed.alias aliases get and set, and allows for bidirectional data flow, computed.oneWay only provides an aliased get. The set will not mutate the upstream property, rather causes the current property to become the value set. This causes the downstream property to permanently diverge from the upstream property.

Example

        
              let User = Ember.Object.extend({
  firstName: null,
  lastName: null,
  nickName: Ember.computed.oneWay('firstName')
});

let teddy = User.create({
  firstName: 'Teddy',
  lastName:  'Zeenny'
});

teddy.get('nickName');              // 'Teddy'
teddy.set('nickName', 'TeddyBear'); // 'TeddyBear'
teddy.get('firstName');             // 'Teddy'

or (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:467

dependentKey: String
returns: Ember.ComputedProperty; computed property which performs a logical `or` on the values of all the original values for properties.

A computed property which performs a logical or on the original values for the provided dependent properties.

You may pass in more than two properties and even use property brace expansion. The computed property will return the first truthy value or last falsy value just like JavaScript's || operator.

Example

        
              let Hamster = Ember.Object.extend({
  readyForRain: Ember.computed.or('hasJacket', 'hasUmbrella'),
  readyForBeach: Ember.computed.or('{hasSunscreen,hasUmbrella}')
});

let tomster = Hamster.create();

tomster.get('readyForRain'); // undefined
tomster.set('hasUmbrella', true);
tomster.get('readyForRain'); // true
tomster.set('hasJacket', 'Yes');
tomster.get('readyForRain'); // 'Yes'
tomster.set('hasSunscreen', 'Check');
tomster.get('readyForBeach'); // 'Check'

readOnly (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:581

Available since v1.5.0

dependentKey: String
returns: Ember.ComputedProperty; computed property which creates a one way computed property to the original value for property.

Where computed.oneWay provides oneWay bindings, computed.readOnly provides a readOnly one way binding. Very often when using computed.oneWay one does not also want changes to propagate back up, as they will replace the value.

This prevents the reverse flow, and also throws an exception when it occurs.

Example

        
          
              
              let User = Ember.Object.extend({
  firstName: null,
  lastName: null,
  nickName: Ember.computed.readOnly('firstName')
});

let teddy = User.create({
  firstName: 'Teddy',
  lastName:  'Zeenny'
});

teddy.get('nickName');              // 'Teddy'
teddy.set('nickName', 'TeddyBear'); // throws Exception
// throw new Ember.Error('Cannot Set: nickName on: <User:ember27288>' );`
teddy.get('firstName');             // 'Teddy'
            

        
      

reads (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/computed_macros.js:569

dependentKey: String
returns: Ember.ComputedProperty; computed property which creates a one way computed property to the original value for property.

This is a more semantically meaningful alias of computed.oneWay, whose name is somewhat ambiguous as to which direction the data flows.

setDiff (setAProperty, setBProperty) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:543

setAProperty: String
setBProperty: String
returns: Ember.ComputedProperty; computes a new array with all the items from the first dependent array that are not in the second dependent array

A computed property which returns a new array with all the properties from the first dependent array that are not in the second dependent array.

Example

        
              let Hamster = Ember.Object.extend({
  likes: ['banana', 'grape', 'kale'],
  wants: Ember.computed.setDiff('likes', 'fruits')
});

let hamster = Hamster.create({
  fruits: [
    'grape',
    'kale',
  ]
});

hamster.get('wants'); // ['banana']

sort (itemsKey, sortDefinition) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:634

itemsKey: String
sortDefinition: String or Function; a dependent key to an array of sort properties (add `:desc` to the arrays sort properties to sort descending) or a function to use when sorting
returns: Ember.ComputedProperty; computes a new sorted array based on the sort property array or callback function

A computed property which returns a new array with all the properties from the first dependent array sorted based on a property or sort function.

The callback method you provide should have the following signature:

        
              function(itemA, itemB);

itemA the first item to compare.
itemB the second item to compare.

This function should return negative number (e.g. -1) when itemA should come before itemB. It should return positive number (e.g. 1) when itemA should come after itemB. If the itemA and itemB are equal this function should return 0.

Therefore, if this function is comparing some numeric values, simple itemA - itemB or itemA.get( 'foo' ) - itemB.get( 'foo' ) can be used instead of series of if.

Example

        
          
              
              let ToDoList = Ember.Object.extend({
  // using standard ascending sort
  todosSorting: ['name'],
  sortedTodos: Ember.computed.sort('todos', 'todosSorting'),

  // using descending sort
  todosSortingDesc: ['name:desc'],
  sortedTodosDesc: Ember.computed.sort('todos', 'todosSortingDesc'),

  // using a custom sort function
  priorityTodos: Ember.computed.sort('todos', function(a, b){
    if (a.priority > b.priority) {
      return 1;
    } else if (a.priority < b.priority) {
      return -1;
    }

    return 0;
  })
});

let todoList = ToDoList.create({todos: [
  { name: 'Unit Test', priority: 2 },
  { name: 'Documentation', priority: 3 },
  { name: 'Release', priority: 1 }
]});

todoList.get('sortedTodos');      // [{ name:'Documentation', priority:3 }, { name:'Release', priority:1 }, { name:'Unit Test', priority:2 }]
todoList.get('sortedTodosDesc');  // [{ name:'Unit Test', priority:2 }, { name:'Release', priority:1 }, { name:'Documentation', priority:3 }]
todoList.get('priorityTodos');    // [{ name:'Release', priority:1 }, { name:'Unit Test', priority:2 }, { name:'Documentation', priority:3 }]
            

        
      

sum (dependentKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:65

Available since v1.4.0

dependentKey: String
returns: Ember.ComputedProperty; computes the sum of all values in the dependentKey's array

A computed property that returns the sum of the values in the dependent array.

union (propertyKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:450

propertyKey: String
returns: Ember.ComputedProperty; computes a new array with all the unique elements from the dependent array

A computed property which returns a new array with all the unique elements from one or more dependent arrays.

Example

        
          
              
              let Hamster = Ember.Object.extend({
  uniqueFruits: Ember.computed.union('fruits', 'vegetables')
});

let hamster = Hamster.create({
  fruits: [
    'banana',
    'grape',
    'kale',
    'banana',
    'tomato'
  ],
  vegetables: [
    'tomato',
    'carrot',
    'lettuce'
  ]
});

hamster.get('uniqueFruits'); // ['banana', 'grape', 'kale', 'tomato', 'carrot', 'lettuce']
            

        
      

uniq (propertyKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:354

propertyKey: String
returns: Ember.ComputedProperty; computes a new array with all the unique elements from the dependent array

A computed property which returns a new array with all the unique elements from one or more dependent arrays.

Example

        
              let Hamster = Ember.Object.extend({
  uniqueFruits: Ember.computed.uniq('fruits')
});

let hamster = Hamster.create({
  fruits: [
    'banana',
    'grape',
    'kale',
    'banana'
  ]
});

hamster.get('uniqueFruits'); // ['banana', 'grape', 'kale']

uniqBy (dependentKey, propertyKey) Ember.ComputedProperty public

Module: ember

Defined in packages/ember-runtime/lib/computed/reduce_computed_macros.js:403

dependentKey: String
propertyKey: String
returns: Ember.ComputedProperty; computes a new array with all the unique elements from the dependent array

A computed property which returns a new array with all the unique elements from an array, with uniqueness determined by specific key.

Example

        
          
              
              let Hamster = Ember.Object.extend({
  uniqueFruits: Ember.computed.uniqBy('fruits', 'id')
});
let hamster = Hamster.create({
  fruits: [
    { id: 1, 'banana' },
    { id: 2, 'grape' },
    { id: 3, 'peach' },
    { id: 1, 'banana' }
  ]
});
hamster.get('uniqueFruits'); // [ { id: 1, 'banana' }, { id: 2, 'grape' }, { id: 3, 'peach' }]
            

        
      