javascript - 按数组中相同的值合并对象

Question

我需要合并价格相同的对象并添加数量（amount）。

例子：

[
    {price: 25.1, amount: 32},
    {price: 45.2, amount: 45},
    {price: 25.1, amount: 25},
    {price: 44.0, amount: 13},
    {price: 45.2, amount: 23}
]

结果：

[
    {price: 25.1, amount: 57}, // 32 + 25
    {price: 45.2, amount: 68}, // 45 + 23
    {price: 44.0, amount: 13},
]

标签： javascriptarrays

Answer 1

您可以使用Array#reduce对象来存储每个价格的金额。

const example = [
    {price: 25.1, amount: 32},
    {price: 45.2, amount: 45},
    {price: 25.1, amount: 25},
    {price: 44.0, amount: 13},
    {price: 45.2, amount: 23}
]
const res = Object.values(example.reduce((acc,{price,amount})=>
   ((acc[price] = acc[price] || {price, amount: 0}).amount += amount, acc), {}));
console.log(res);