Why does my array add zeros on the end?

def filter(data : Array[Int]) : Array[Int] = {


    var list: List[Int] = List();
    var index = 0;

    for(index <- data){
        if(index % 2 == 0){
        list.add(index);
        }
    }
    var myArray = new Array[Int](list.length);
    index = 0;
    for(index <- list){
        myArray(index) = index;
    }

    return myArray;


}

The array is meant to take data and filter all even numbers and return it, when i return it, it has lots of zeros added into the array. Please help? Thank you