angular.Array.count

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Description

Determines the number of elements in an array. Optionally it will count only those elements for which the condition evaluets to true.

Note: this function is used to augment the Array type in angular expressions. See angular.Array for more info.

Usage

angular.Array.count(array, condition);

Parameters

array – {Array} – The array to count elements in.
condition(optional) – {(function()|string)} – A function to be evaluated or angular expression to be compiled and evaluated. The element that is currently being iterated over, is exposed to the condition as this.

Returns

number – Number of elements in the array (for which the condition evaluates to true).

Example

<pre ng:init="items = [{name:'knife', points:1}, {name:'fork', points:3}, {name:'spoon', points:1}]"></pre> <ul> <li ng:repeat="item in items"> {{item.name}}: points= <input type="text" name="item.points"/>  </li> </ul> Number of items which have one point: {{ items.$count('points==1') }} Number of items which have more than one point: {{items.$count('points>1')}} it('should calculate counts', function() { expect(binding('items.$count(\'points==1\')')).toEqual(2); expect(binding('items.$count(\'points>1\')')).toEqual(1); }); it('should recalculate when updated', function() { using('.doc-example li:first-child').input('item.points').enter('23'); expect(binding('items.$count(\'points==1\')')).toEqual(1); expect(binding('items.$count(\'points>1\')')).toEqual(2); });