Chunks an array into smaller arrays of a specified size.

Use Array.from() to create a new array, that fits the number of chunks that will be produced.
Use Array.prototype.slice() to map each element of the new array to a chunk the length of size.
If the original array can’t be split evenly, the final chunk will contain the remaining elements.

代码片段

const chunk = (arr, size) =>
  Array.from({ length: Math.ceil(arr.length / size) }, (v, i) =>
    arr.slice(i * size, i * size + size)
  );

使用样例

chunk([1, 2, 3, 4, 5], 2); // [[1,2],[3,4],[5]]