if-statements – checking strings for being null
hello again!
Yesterday I wrote some code again and had to check if a String is null or not. The check was performed in a for-loop.
Below is some example code:
public var arrToFill:Array = [];
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[… some more code here …]
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private function foo():void
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{
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var i:uint;
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for( i = 0; i < 10; ++i)
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{
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if(!arrToFill[i])
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{
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arrToFill[i] = '';
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}
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}
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}
This function was called different times and I wondered, that the if-statement returned false everytime.
For me it was theoretically correct that an Array-Element with a value of ” is not empty, because ” is an empty String for me, but it is something.
ActionScript3 doesn’t work like that, so for AS3 a String with a value of ” is equal to null or 0.
Conclusion:
If you have code like this and want to preallocate an element, just set it to 1. Then you can do a simpy
if(!arrToFill[i])
and everything would be fine.
