MakeYourBooleanChecksBoolean.as

// This is just one of the reasons why
// treating null as a boolean false
// is Bad and Wrong

var iAmAStringInstance :String = "";
var iAmANullString :String = null;

if(iAmAStringInstance)
{
    trace("iAmAStringInstance: That there is an instance!");
}
else
{
    trace("iAmAStringInstance: That there is a null object!");
}


if(iAmANullString)
{
    trace("iAmANullString: That there is an instance!");
}
else
{
    trace("iAmANullString: That there is a null object!");
}

// Trace outputs:
//
//   iAmAStringInstance: That there is a null object!
//   iAmANullString: That there is a null object!
//
// As I said, both Bad and Wrong ;)