function update_array(str, slinger_array) {

    for (var i = 0; i < str.length(); i++) { // Loop through each character of the string

        if (slinger_array[i] == undefined) { // If array element does not exist yet, push new element

            slinger_array.push({
                "slinger_char": {
                    "id": i,
                    "character": str.charAt(i)
                }
            });
        }
        else // if the array element exists, update only the character
        {
            slinger_array[i].character = str.charAt(i);
        }
    }
}