如何计算多个数组的总和? [英] How to calculate the sum of multiple arrays?

问题描述

我正在尝试解决一个方程，在该方程中，我从索引后的数组列表中添加数字.

I am trying to solve an equation where I add numbers from a list of arrays following the indices.

列表的每个数组都是随机生成的 4 个数字的固定长度数组，如下所示:

Each array of a list are a randomly generated fixed-length array of 4 numbers like so:

const list = [
  [2, 9, 1, 2],
  [2, 3, 9, 4],
  [4, 7, 8, 1]
]

所以我想要做的是从每个数组中获取每个索引的每个数字的总和.像这样:

So what I am trying to do is get the sum of each number of each index from each array. Like so:

const list = [
  [2, 9, 1, 2],
  [2, 3, 9, 4],
  [4, 7, 8, 1]
]

// expectedResult = [8, 19, 18, 7];

我怎样才能做到这一点?

How can I achieve this?

推荐答案

这是另一种使用 map() 在第一个数组上，嵌套有 reduce() 生成相应列的总数.

This is another approach that uses map() over the first array, nested with a reduce() that generated the total of the corresponding column.

const list = [
  [2, 9, 1, 2],
  [2, 3, 9, 4],
  [4, 7, 8, 1]
];

const sums = list[0].map((x, idx) => list.reduce((sum, curr) => sum + curr[idx], 0));

console.log(sums);

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