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.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b35d38-2bfdc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35d38-2bfdc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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