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November 28, 2022 11:42
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Move an element frome an array up or down.
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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); |
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A better alternative to move by index directly
(also fixed the issue when moving with index 10)