BindTest.fx

public class BindTest extends TestCase {

    var seq: Bean[];
    var tmp: Number[] = bind for (bean: Bean in seq) {
                sum(bean)
            };

    bound function sum(bean:Bean):Number {
        return bean.x * bean.y
    }

    var bean1:Bean = Bean {
        x: 2, y:4
    }

    var bean2:Bean = Bean {
        x: 1, y:2
    }

    function totalSum(tmp: Number[]): Number {
        var result: Number = 0.0;
        for (number: Number in tmp) {
            result += number;
        }
        return result
    }

    var result: Double = bind totalSum(tmp) on replace oldValue = newValue {
            println(newValue);
        }

    public function testBind() {
        println("Inserting bean 1");
        insert bean1 into seq;
        Assert.assertEquals(result, Double.valueOf(8));
        println("Inserting bean 2");
        insert bean2 into seq;
        Assert.assertEquals(result, Double.valueOf(10));
        println("Modifiying bean 1");
        bean1.x = 5;
        Assert.assertEquals(result, Double.valueOf(22));
    }

}