获取 ActionScript 3 字典的大小 [英] Get size of ActionScript 3 Dictionary

问题描述

var d:Dictionary = new Dictionary();
d["a"] = "b";
d["b"] = "z";

如何获取字典的长度/大小(2)?

How to get the length/size of the dictionary (which is 2) ?

推荐答案

没有内置方法来获取 AS3 字典的大小/长度/计数.有一些变通方法:例如，您可以创建一个自定义字典类来扩展或包装 flash.utils.Dictionary 类，添加计数器功能.您可以在添加/删除条目时管理计数，或者使用简单的 For 循环迭代按需计数:

There is no built-in method to get the size/lenght/count of an AS3 dictionary. There are workarounds: for example, you can create a custom dictionary class which extends or wraps the flash.utils.Dictionary class, adding the counter functionality. You can manage the count as entries are added/removed, or count on-demand using a simple For loop iteration:

public static function countKeys(myDictionary:flash.utils.Dictionary):int 
{
    var n:int = 0;
    for (var key:* in myDictionary) {
        n++;
    }
    return n;
}

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