JavaScript 根据属性分离对象
javascriptweb developmentfront end technology更新于 2024/7/9 11:37:00
假设，我们有一个像这样的对象 −
const obj = {
0: { "time": 1, "day": 1, },
1: { "time": 2, "day": 1, },
2: { "time": 3, "day": 1, },
3: { "time": 1, "day": 2, },
4: { "time": 2, "day": 2, },
5: { "time": 3, "day": 2, }
};
我们需要编写一个 JavaScript 函数，该函数接受一个这样的对象，并将所有键值对分组到单独的子对象中，这些子对象对于 day 键具有相同的值。
输出
上述对象的输出应为 −
const output = { '1':
{ '1': { time: 1, day: 1 },
'2': { time: 2, day: 1 },
'3': { time: 3, day: 1 } },
'2':
{ '1': { time: 1, day: 2 },
'2': { time: 2, day: 2 },
'3': { time: 3, day: 2 } }
}
示例
其代码为 −
const obj = {
0: { "time": 1, "day": 1, },
1: { "time": 2, "day": 1, },
2: { "time": 3, "day": 1, },
3: { "time": 1, "day": 2, },
4: { "time": 2, "day": 2, },
5: { "time": 3, "day": 2, }
};
const groupObject = obj => {
let res = {};
res = Object.values(obj).reduce((acc, val) => {
if(acc[val['day']] === undefined){
acc[val['day']] ={};
};
acc[val['day']][val['time']] = val;
return acc;
},{});
return res;
};
console.log(groupObject(obj));
输出
控制台中的输出 −
{
'1': {
'1': { time: 1, day: 1 },
'2': { time: 2, day: 1 },
'3': { time: 3, day: 1 }
},
'2': {
'1': { time: 1, day: 2 },
'2': { time: 2, day: 2 },
'3': { time: 3, day: 2 }
}
}
