How do I swap two items in an observableArray?

Question

I have a button that moves an item one position left in an observableArray. I am doing it the following way. However, the drawback is that categories()[index] gets removed f

Answer 1

thanks to Michael Best for his version of moveup

my version of moveDown

moveDown: function(category) {
    var array = categories();
    var i = categories.indexOf(category);
    if (i < arr.length) {
        categories.splice(i, 2, array[i + 1], array[i]);
    }
}