var swapItems = function(arr, index1, index2){ arr[index1] = arr.splice(index2,1,arr[index1])[0] return arr } var arr = [1,2,3] var newArr = [] upData ...
var swapItems = function(arr, index1, index2){ arr[index1] = arr.splice(index2,1,arr[index1])[0] return arr } var arr = [1,2,3] var newArr = [] upData (arr, index) { if (this.arr.length > 1 && index !== 0) { newArr = swapItems(arr, index, index - 1) } } downData (arr, index) { if (this.arr.length > 1 && index !== (this.arr.length - 1)) { newArr = swapItems(this.arr, index, index + 1) } }
