javascript - 根据索引的嵌套数组的总和

Question

如果我有这些相应的数组，里面有 2 个嵌套数组(这可能有 2 个或更多):

const nums = [
    [4, 23, 20, 23, 6, 8, 4, 0],      // Each array consists of 8 items
    [7, 5, 2, 2, 0, 0, 0, 0] 
];

如何根据索引对它们进行加法？

预期结果:

// 11 is from 4 (array1 - index1) + 7 (array2 - index1)
// and so on.
[11, 28, 22, 25, 6, 8, 4, 0]

我所做的是:

// This will work but it will only be applicable for 2 arrays as what if there will be 2 or more making it dynamic 

const total = Array.from({ length: 8 }, (_, i) => nums[0][i] + nums[1][i]);

Answer 1

这支持n个嵌套数组

const nums = [
  [4, 23, 20, 23, 6, 8, 4, 0],
  [7, 5, 2, 2, 0, 0, 0, 0],
  [2, 1, 2, 5, 7, 8, 9, 4]
];


const total = nums.reduce((a, b) => a.map((c, i) => c + b[i]));

console.log(total);