在数组中求和数组(JavaScript)

Sum arrays in array (JavaScript)(在数组中求和数组(JavaScript))

问题描述

我有一个由多个数组组成的数组:

I have an array that consists of multiple arrays:

var array = [[1], [2, 1, 1], [3, 4]];

现在我想得到一个数组，它的元素是变量array"中每个数组的总和.在这个例子中，这将是 var sum = [1, 4, 7].我该怎么做?

Now I want to get an array that has elements that are the sums of each array in the variable "array". In this example that would be var sum = [1, 4, 7]. How can I do this?

推荐答案

您可以使用 Array#map 返回新项目.可以使用 Array#reduce 准备项目以汇总所有内部元素.

You can use Array#map to return the new items. The items can be prepared using Array#reduce to sum up all the inner elements.

var array = [[1], [2, 1, 1], [3, 4]];

var newArray = array
  .map(arr => arr.reduce((sum, item) => sum += item, 0));

console.log(newArray);

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