actionscript-3 - Array.filter 动态测试值

Question

this is from Adobe docs :

package {
    import flash.display.Sprite;
    public class Array_filter extends Sprite {
        public function Array_filter() {
            var employees:Array = new Array();
            employees.push({name:"Employee 1", manager:false});
            employees.push({name:"Employee 2", manager:true});
            employees.push({name:"Employee 3", manager:false});
            trace("Employees:");
            employees.forEach(traceEmployee);

            var managers:Array = employees.filter(isManager);
            trace("Managers:");
            managers.forEach(traceEmployee);
        }
        private function isManager(element:*, index:int, arr:Array):Boolean {
            return (element.manager == true);
        }
        private function traceEmployee(element:*, index:int, arr:Array):void {
            trace("\t" + element.name + ((element.manager) ? " (manager)" : ""));
        }
    }
}

问题出在 Array 类的过滤方法上。它是这样工作的:你传递一个函数作为过滤器的参数，然后根据你传递的函数返回一个数组。问题是您似乎无法添加任何其他参数。因此，如果您必须从同一个数组创建(例如在 for 循环内)4 个数组并且您想要使用相同的函数，则只能针对您必须事先设置为要测试的值的类的属性进行测试.

还有其他方法可以添加该参数吗？

Answer 1

当按数组中的变量对象属性进行过滤时，我将过滤包装到另一个函数中:

protected function FilterByProperty(input_array:Array, extra_testing:Object):Array
{
    function FilterFunction(element:Object, index:int, array:Array):Boolean
    {
        return element.property == extra_testing; // Arbitrary test
    }

    return input_array.filter(FilterFunction);
}

var filtered_array:Array = FilterByProperty(unfiltered_array, test_property);