Is there a static property in Action similar to that in the String object in .net to check if a string is empty, that is String.Empty.
Thanks
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3 Answers
You can simply do:
if(string)
{
// String isn't null and has a length > 0
}
else
{
// String is null or has a 0 length
}
This works because the string is coerced to a boolean value using these rules:
String -> Boolean = "false if the value is null or the empty string ( "" ); true otherwise."
3 Comments
Hassan Mokdad
Me too :S, It is emportant not to compare against "" so as not to create unnecessary strings
sch
This works indeed. Look at the paragraph casting to boolean here help.adobe.com/en_US/as3/learn/…
Learner
Bellissimo! The most elegant solution :)
The following will catch all of these:
- NULL
- empty string
- whitespace only string
import mx.utils.StringUtil;
var str:String
if(!StringUtil.trim(str)){
...
}
1 Comment
Florian F
It does not answer exactly the question, but is useful nonthelesss.
You can use length but that is a normal property not a static one. You can find here all the properties of of the class String. If length is 0 the string is empty. So you can do your tests as follows if you want to distinguish between a null String and an empty one:
if (!myString) {
// string is null
} else if (!myString.length) {
// string is empty
} else {
// string is not empty
}
Or you can use Richie_W's solution if you don't need to distinguish between empty and null strings.
1 Comment
Hassan Mokdad
Thanks, actually I need only to check if empty or null