Angularjs filter sorting using functions, how to use ah?

this is the angularjs manual explained by orderBy, which god wrote an example to tell how to use expression when it is a function function?

Mar.05,2021

finally fumbled out the answer, answer it yourself, ha!

app.controller('ctl', function($scope){
    $scope.myOrder = function(item){
        return item.orderNum > 3: true: false;
    }
});

myOrder returns true,item to arrange backwards, otherwise forward.

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