Seek and destroy unknown array elements

Question

Hi, I'm looking for a way to determine if my array contains a specific element (without knowing what position number it is in the array)based on it's content, and then splices/deletes it.
I found this from kirupa:
Array.prototype.contains = function(input){
        for (var i in this) {
                if (this[i] == input) {
                        return 1;
return 0;
//usage
myArray.contains("value");
and figure I could use something like it with
myArray.splice(target,1);
the only problem I'm seeing is getting "target" in the splice command to equal the "input" in the myArray.contains(); function.
I originally needed this because I'm trying to add elements with prerequisites or associations intact, and subsequently when deleting the prerequsite for several other elements, those elements would also be deleted.

Answer 1

last night/1am this morning before passing out I wrote this demo up to test if the idea was even going to work.
Array.prototype.getIndex = function(data) {
    for (i=0; i<this.length; ++i) {
        if (this[i] == data) {
            return i;
    return -1;
var afruit:Array = new Array(3);
afruit[0] = "apple";
afruit[1] = " orange";
afruit[2] = "banana";
swap = 0;
onEnterFrame = function(){
fruit.text = afruit.toString();
swapup.onPress = function(){if(swap < 2){swap++;}}
swapdown.onPress = function(){if(swap > 0){swap--;}}
fruitlist.text = afruit[swap];
erase.onPress = function(){
if(fruitlist.text == String(" orange")){afruit.splice(1,1);
seeker = afruit.getIndex("apple"); outpuut.text = afruit.splice(seeker,1);
but I don't have a clue why essentially the same program doesn't work for my larger arrays. I also feel this version is rather cumbersome and would prefer my function contain the splice (but don't know how). In the large program I have this prerequisite system rigged so if you add certain elements to a list, prerequisite elements are added as well, using the format:
addmcI.onPress = function(){
if(mylistedelement == "ElementwithPrerequisite"){myArray.push(" "+ "Prerequisite");}
I'm seriously wondering if the reason my fruit list works and my main program doesn't is because of the " "+ added.