===(strict equal operator)
“Tests two expressions for equality; the strict equality (===
)operator performs in the same way as the equality (==
) operator, except that data types are not converted. The result is true
if both expressions, including their data types, are equal. ”
Usage:
var tfrmt:TextFormat = new TextFormat();
var attr:String = “font”;
trace( tfrmt[attr]==null); //”true”
trace( tfrmt[attr]==undefined); //”true”
trace( tfrmt[attr]===null); //”true”
trace( tfrmt[attr]===undefined); //”false”