moveItem - Repositioning an element within a Javascript array

moveItem.js

/**
 * moveItem
 *
 * Remove the element positioned at oldIdx, 
 * and insert this back into the array positioned at newIdx
 * 
 * This does not do any bounds checking on the inputs
 *
 * @param  array
 * @param  integer old index
 * @param  integer new index
 * @return array   modified array
 *
 */
function moveItem(arr, oldIdx, newIdx) {
    return arr.splice(newIdx, 0, arr.splice(oldIdx, 1)[0]);
}