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20 lines
563 B
JavaScript
20 lines
563 B
JavaScript
function move(arr, old_index, new_index) {
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while (old_index < 0) {
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old_index += arr.length;
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}
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while (new_index < 0) {
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new_index += arr.length;
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}
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if (new_index >= arr.length) {
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var k = new_index - arr.length;
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while ((k--) + 1) {
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arr.push(undefined);
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}
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}
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arr.splice(new_index, 0, arr.splice(old_index, 1)[0]);
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return arr;
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}
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console.log(move([10, 20, 30, 40, 50], 0, 2));
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console.log(move([10, 20, 30, 40, 50], -1, -2));
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