javascript - 如何返回该对象数组的总计？

Question

我需要计算这些的价格和税金并返回所有内容的总计。我正在学习，所以我对这个简单的问题表示歉意。

const orders = [{"price":15,"tax":0.09},{"price":42,"tax":0.07},{"price":56,"tax":0.11},
{"price":80,"tax":0.11},{"price":69,"tax":0.06},{"price":68,"tax":0.14},
{"price":72,"tax":0.14},{"price":51,"tax":0.09},{"price":89,"tax":0.15},
{"price":48,"tax":0.13}];
// Do not edit code above.

/*
  Use a higher-order method to get the sum of all the order totals after adding in the sales tax
*/

var ordersTotal  = orders.reduce(function(total, num) {
    return total + num;
    })
  ordersTotal;
  

Answer 1

只需使用 Array.reduce()和 Object destructing 。请确保将 0 作为初始值传递给您的reduce 函数。

const orders = [{"price":15,"tax":0.09},{"price":42,"tax":0.07},{"price":56,"tax":0.11},{"price":80,"tax":0.11},{"price":69,"tax":0.06},{"price":68,"tax":0.14},{"price":72,"tax":0.14},{"price":51,"tax":0.09},{"price":89,"tax":0.15},{"price":48,"tax":0.13}];

const result = orders.reduce((a,{price,tax})=>a+price+tax,0);

console.log(result);