如何使用JavaScript从数组中获取总和？

本文介绍了如何使用JavaScript从数组中获取总和？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 var data =[ { name:"xyz", meals:[ {num:3.5},{num:4 },{num:6.5},{num:3} ], deposits:[ {date:"", amount:3000}, {date:"", amount:2400}, {date:"", amount:300}, ]; }, { name:"abc", meals:[ {num:3.5},{num:4 },{num:6.5},{num:3} ], deposits:[ {date:"", amount:3000}, {date:"", amount:2400}, {date:"", amount:300}, ]; } ];

我想获取膳食总和。

I want to get the sum of meals & deposits for every name or object.

推荐答案

使用 Array.map 和 Array.reduce

var data =[{name:"xyz",meals:[{num:3.5},{num:4 },{num:6.5},{num:3}],deposits:[{date:"", amount:3000},{date:"", amount:2400},{date:"", amount:300}]},{name:"abc",meals:[{num:3.5},{num:4 },{num:6.5},{num:3}],deposits:[{date:"", amount:3000},{date:"", amount:2400},{date:"", amount:300}]}]; let result = data.map(({name, meals, deposits}) => ({name, meals : meals.reduce((a,c) => a + c.num, 0), deposits : deposits.reduce((a,c) => a + c.amount, 0)})); console.log(result);