Moves the specified amount of elements to the end of the array.
- Use
Array.prototype.slice()
twice to get the elements after the specified index and the elements before that. - Use the spread operator (
...
) to combine the two into one array. - If
offset
is negative, the elements will be moved from end to start.
代码实现
const offset = (arr, offset) => [...arr.slice(offset), ...arr.slice(0, offset)];
offset([1, 2, 3, 4, 5], 2); // [3, 4, 5, 1, 2]
offset([1, 2, 3, 4, 5], -2); // [4, 5, 1, 2, 3]
翻译自:https://www.30secondsofcode.org/js/s/offset-array-elements