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<div ng-app="myapp">
    <div ng-controller="mycontroller as ctrl">
        <div ng-repeat="items in ctrl.notes">
            <div ng-class="ctrl.getClass(items.done)">{{ items.label }}</div>
        </div>
    </div>
</div>

div {
    padding:5px;
}

.done {
    background:red;
}

.pending {
    background:blue;
}

angular.module("myapp",[]).controller("mycontroller",[function() {
    var self = this;
    self.notes = [
        { label : "test1", done: false },
        { label : "test2", done: true },
        { label : "test3", done: false }
    ];
    self.getClass = function(status) {
        return {
            done : status,
            pending : !status
        }
    }
}]);