-
-
Save cab8021/2488ece9e30908e40ac9fe0ea06acd72 to your computer and use it in GitHub Desktop.
Move an element frome an array up or down.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| var move = function(array, element, delta) { | |
| var index = array.indexOf(element); | |
| var newIndex = index + delta; | |
| if (newIndex < 0 || newIndex == array.length) return; //Already at the top or bottom. | |
| var indexes = [index, newIndex].sort(); //Sort the indixes | |
| array.splice(indexes[0], 2, array[indexes[1]], array[indexes[0]]); //Replace from lowest index, two elements, reverting the order | |
| }; | |
| var moveUp = function(array, element) { | |
| move(array, element, -1); | |
| }; | |
| var moveDown = function(array, element) { | |
| move(array, element, 1); | |
| }; | |
| //Test | |
| var array = [1, 2, 3, 4, 5]; | |
| moveUp(array, 4); | |
| moveUp(array, 2); | |
| moveDown(array, 5); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment