将数组按照指定长度分组

[javascript]代码库

const arr = [1, 2, 3, 4, 5, 6, 7, 8];
const groupSize = 3;
const groups = arr.reduce((accumulator, currentValue, index) => {
  if (index % groupSize === 0) {
    accumulator.push([]);
  }
  accumulator[accumulator.length - 1].push(currentValue);
  return accumulator;
}, []);
console.log(groups); // [[1, 2, 3], [4, 5, 6], [7, 8]]