在AS3中展开var args

Question

我想知道是否有某种方法可以解压缩AS3中的可变长度参数列表.以此为例:

public function varArgsFunc(amount:int, ...args):Array
{
    if (amount == 3)
    {
        return args
    }
    else
    {
        return varArgsFunc(++amount, args)
    }
}

如果我这样称呼:

var result:Array = varArgsFunc(0, [])

result现在包含一组嵌套的数组:

[[[[]]]]

这里的问题是args参数被视为一个数组.因此,如果我将它传递给具有可变参数列表的函数,它将被视为单个参数.

在Scala中有:_*运算符,它告诉编译器将列表拆分为参数列表:

var list:Array = ['A', 'B', 'C']

// now imagine we have this class, but I would like to pass each list element
// in as a separate argument
class Tuple {
    public function Tuple(...elements)
    {
        // code 
    } 
}

// if you do this, the list will become be passed as the first argument
new Tuple(list)

// in scala you can use the :_* operator to expand the list
new Tuple(list :_*)

// so the :_* operator essentially does this
new Tuple(list[0], list[1], list[2])

我想知道AS3中是否存在技术/运算符以将数组扩展为参数列表.

Answer 1

对所有函数的apply()方法允许您传入数组中的参数而不是"正常"方式.

package {
    import flash.display.Sprite;

    public class Foo extends Sprite {

        public function Foo() {

            var args:Array = ["a", "b", "c"];

            // "normal" call
            varArgsFunc(args);

            // what you wanted:
            varArgsFunc.apply(null, args);
        }

        public function varArgsFunc(...args):Array {
            trace("got", args);
        }

    }

}