Const swap = (arr = [], start = 0, end = 0) => { let result = new Map(); arr.map((_, index) => { switch (index) { case start: return result.set(index, arr[end]); case end: return result.set(index, arr[start]); default: return result.set(index, arr[index]); } }); return Array.from(result.values()); }; if (swapIndex) {const newArr = swap(capabilities, 0, swapIndex) console.log(newArr)} tattoo idea