Unique

What?

Filters out all duplicate objects items from an array by checking the specified key

{{items | unique:attribute | json}}

How?

The filter can take the name of the key to check for uniqueness or set to a non-string truthy value to check the entire object.

<select ng-model="attribute">
<option value="">-- No Filter --</option>
<option>firstName</option>
<option>lastName</option>
<option>id</option>
<option>gender</option>
</select>
<pre>{{items | unique:attribute | json}}</pre>

<script>
$scope.items = [
{ firstName: 'Dean', lastName: 'Sofer',
id: 1, gender: 'Male' },
{ firstName: 'Dean', lastName: 'Kuntz',
id: 2, gender: 'Male' },
{ firstName: 'Peter', lastName: 'Piper',
id: 3, gender: 'Female' },
{ firstName: 'Peter', lastName: 'Darwin',
id: 4, gender: 'Male' },
{ firstName: 'Janet', lastName: 'Piper',
id: 5, gender: 'Female' },
{ firstName: 'Dan', lastName: 'Doyon',
id: 6, gender: 'Male' },
{ firstName: 'Andy', lastName: 'Joslin',
id: 1, gender: 'Male' },
];
</script>