哪种方法可以检查在as3中持有布尔值的对象变量？

Question

        var myString:Object = "true";
        if (myString.toLowerCase() == "true")

or

        if (myString is Boolean)

or

        if (myString == Boolean)

Which one is good to check the object variable is holding boolean values (true or false). Or which one is right?

Thanks...

Answer 1

The short answer is :

the first instruction : if (myString.toLowerCase() == "true") .

---

The long answer is :

still the first instruction : if (myString.toLowerCase() == "true") .

because you are really checking if your string is equals to "true" , while in the 2nd instruction you are checking if your string is a Boolean , and in the 3rd one your checking if your string is the Boolean class.

Hope that can help.

Answer 2

Honestly, your example code doesn't make much sense: you have an Object variable, yet you assume it is a String by using toLowerCase() , yet you check if it's a Boolean , too. If you know it's a string, make your variable a String :

var myString:String = "true";

If you don't know it's a string, you need to check if it's a string, or else you will get an error when if it's not a string:

if (myObject is String && (myObject as String).toLowerCase() == "true")

If it could be a boolean, you should check it as a boolean, too:

else if(myObject is Boolean && (myObject as Boolean) == true)

In general, you would be much better off having some kind of decoding process somewhere before this code so that you know what kind of data you are dealing with, and comparisons are straight forward. For example, JSON.parse() of a JSON data structure will result in actual boolean values for boolean, and you can decode it into typed objects with properties of type Boolean . The example code you have here is very fragile.

Good luck.