js移动数组的顺序

Question

如何将数组 ['a', 'b', 'c', 'd', 'e'] 中的 index==3移动到index==1中, 变成 ['a', 'd', 'b', 'c', 'e']
要求: 代码越简短越好

Answer 1

const arr = ['a', 'b', 'c', 'd', 'e'];

arr.splice(1, 0, arr.splice(3, 1)[0]);

Answer 2

let arr=['a', 'b', 'c', 'd', 'e'] ; arr.splice(1,3,'d','b','c')

Answer 3

function move([a, b, c, d, e, ...rest]) {
    return [a, d, b, c, e, ...rest]
}

Answer 4

function mirrorWrap(arr, sourceIndex) {
  var t = arr[sourceIndex];
  var mirrorIndex = arr.length - sourceIndex - 1;
  arr[sourceIndex] = arr[mirrorIndex];
  arr[mirrorIndex] = t;
  return arr;
}

// ["a", "d", "c", "b", "e"]
mirrorWrap(['a', 'b', 'c', 'd', 'e'], 3)