javascript - 从对象数组中减少 javascript 对象

Question

我有一个这样的对象数组：

[{duration: 12, place: 3}, {duration: 21, place: 4}, {duration: 22, place: 3}]

我想合并来自同一个位置值的所有持续时间。如何在 javascript 中编写一个可以给我这样的输出的函数？

[{duration: 34, place: 3}, {duration: 21, place: 4}]

标签： javascript

Answer 1

另一种方法是使用该函数reduce对具有相同位置值的对象进行分组。

const array = [{duration: 12, place: 3}, {duration: 21, place: 4}, {duration: 22, place: 3}],
      result = Object.values(array.reduce((a, {duration, place}) => {
        (a[place] || (a[place] = {duration: 0, place})).duration += duration;
        return a;
      }, {}));
      
console.log(result);

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