Function

mapBy (dependentKey, propertyKey) ComputedProperty public

Module: @ember/object

Defined in packages/@ember/object/lib/computed/reduce_computed_macros.js:230 

import { mapBy } from '@ember/object/computed';
dependentKey
String
propertyKey
String
returns
ComputedProperty
an array mapped to the specified key

Returns an array mapped to the specified key.

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import { mapBy } from '@ember/object/computed';
import EmberObject from '@ember/object';

let Person = EmberObject.extend({
  childAges: 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]