$scope.items = [ 'red', 'blue', 'yellow', 'white', 'blue' ];
<li ng-repeat="item in items">{{ item }}</li>
Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys. Repeater: item in items, Duplicate key: string:blue, Duplicate value: blue
<div ng-repeat="value in [4, 4] track by $index"></div>
<li ng-repeat="item in items track by $index">{{ item }}</li>
$scope.items = [ ['red'], ['blue'], ['yellow'], ['white'], ['blue'] ];
<li ng-repeat="item in items">{{ item }}</li>
[] === []
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