Keal's Sprite Lookup Unit Test

<!DOCTYPE html>
<html>
<head>
<title>Keal's Sprite Lookup Unit Test</title>
</head>
<body>
<script>
// SparkedJS (Beta 2 A) :: "CSV/Frame Lookup.js"

var Maps = {};

var player;

player.map = 0;

Maps[player.map] = {
    colorMap: {
        "0": { Sprite: "Sprite: \"Passage\" (Frame 1/1)", Cast: "Passage" },
        "1": { Sprite: "Sprite: \"Wall\" (Frame 1/1)", Cast: "Barrier" },
        "2": { Sprite: "Sprite: \"Wall\" (Frame 1/1)", Cast: "Passage" },
        "3": { Sprite: "Sprite: \"Shield\" (Frame 1/1)", Cast: "Shield" },
        "4": { Sprite: "Sprite: \"Bomb\" (Frame 1/1)", Cast: "Bomb" },
        "5": { Sprite: "Sprite: \"Wall\" (Frame 1/1)", Cast: "Passage" },
        "6": { Sprite: "Sprite: \"Passage\" (Frame 1/1)", Cast: "Mine" },
        "7": { Sprite: "Sprite: \"Tank\" (Frame 1/1)", Cast: "Tank" },
        "8": { Sprite: "Sprite: \"Wall\" (Frame 1/1)", Cast: "Mine" },
        "9": { Sprite: "Sprite: \"Passage\" (Frame 1/1)", Cast: "Passage" },
        "S": { Sprite: "Sprite: \"Exit\" (Frame 1/1)", Cast: "Spawn" },
        "X": { Sprite: "Sprite: \"Wall\" (Frame 1/1)", Cast: "Exit" }
    }
};

console.log(Sprite_Index_By_Key(undefined, 0));

function Sprite_Index_By_Key(arrayObject = undefined, param = 0) {

    if (!arrayObject){
        arrayObject = Maps[player.map].colorMap;
    }

    if (typeof param === `number`) param = param.toString();

    return Object.keys(arrayObject).find(key => key === param);
}
</script>
</body>
</html>