Initialize the index variable to Array .length -1 and loop until it reaches 0 by decrementing the index variable
package{
import flash.display.Sprite;
public class Main extends Sprite{
public function Main(){
var letters:Array = ["a", "b", "c", "d", "a", "b", "c", "d"];
var match:String = "b";
for (var i:int = letters.length - 1; i >= 0; i--) {
if (letters[i] == match) {
trace("Element with index " + i +
" found to match " + match);
break;
}
}
}
}
}
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