Ember.computed.sort()

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 }]