问题：
javascript - 两个数组对象去重并且根据第一个数据生成一个新的对象？
马俊
各位大佬，我想请问一下我想通过一个数组对象处理另外一个数组对象。生成一个新的数组对象要怎么处理？我想通过两个时间的字段做判断，给新生成的数组对象里面属性的值加上一个1。怎么写都不对。生成的都是有问题的。
通过的数组对象
thisDate: [{ date: "12", prop: "twelve" },{ date: "13", prop: "thirteen" },{ date: "14", prop: "fourteen" },{ date: "15", prop: "fifteen" },{ date: "16", prop: "sixteen" },{ date: "17", prop: "seventeen" },{ date: "18", prop: "eighteen" }],想要处理的数组对象
data: [{ "DATE": "2023-09-04 15:33:54.0", "ROOMNAME": "测试会议室1", "ROOMID": "001" }, { "DATE": "2023-09-04 16:00:00", "ROOMNAME": "测试会议室1", "ROOMID": "001" }, { "DATE": "2023-09-04 17:00:00", "ROOMNAME": "测试会议室1", "ROOMID": "001" }, { "DATE": "2023-09-04 18:00:00", "ROOMNAME": "测试会议室1", "ROOMID": "001" }, { "DATE": "2023-09-04 19:00:00", "ROOMNAME": "测试会议室1", "ROOMID": "001" }, { "DATE": "2023-09-04 20:00:00", "ROOMNAME": "测试会议室1", "ROOMID": "001" }, { "DATE": "2023-09-04 21:00:00", "ROOMNAME": "测试会议室1", "ROOMID": "001" }, { "DATE": "2023-09-04 22:00:00", "ROOMNAME": "测试会议室1", "ROOMID": "001" }, { "DATE": "2023-09-04 23:00:00", "ROOMNAME": "测试会议室1", "ROOMID": "001" }, { "DATE": "2023-09-04 14:53:42.0", "ROOMNAME": "会议室2222", "ROOMID": "002" }, { "DATE": "2023-09-04 15:00:00", "ROOMNAME": "会议室2222", "ROOMID": "002" }, { "DATE": "2023-09-04 16:00:00", "ROOMNAME": "会议室2222", "ROOMID": "002" }, { "DATE": "2023-09-04 17:00:00", "ROOMNAME": "会议室2222", "ROOMID": "002" }, { "DATE": "2023-09-04 18:00:00", "ROOMNAME": "会议室2222", "ROOMID": "002" }, { "DATE": "2023-09-04 19:00:00", "ROOMNAME": "会议室2222", "ROOMID": "002" }, { "DATE": "2023-09-04 20:00:00", "ROOMNAME": "会议室2222", "ROOMID": "002" }]我的思路有问题想不出来了，写的代码不对生成的有问题。
let list = []; for (let i = 0; i < data.length; i++) { let nextIndex = i + 1 let nextEle = data[nextIndex] if (nextIndex < data.length) { if (data[i].ROOMNAME != nextEle.ROOMNAME) { let objData = { name: nextEle.ROOMNAME, } for (let a = 0; a < _this.thisDate.length; a++) { if (data[i].DATE.slice(11, 13) == _this.thisDate[a].date) { objData[_this.thisDate[a].prop] = '1'; } else { objData[_this.thisDate[a].prop] = ''; } } list.push(objData) } } } console.log('生成新的数组对象'); console.log(list);我希望的是生成新的数组对象，合并同名，并且根据thisDate生成新的属性。在和data这个json判断时间对等的属性赋值1。
最后希望生成的格式格式是：
[{ ROOMNAME: '测试会议室', twelve: '', thirteen: '', fourteen: '', fifteen: '', sixteen: '1', seventeen: '1', eighteen:'1', },{ ROOMNAME: '会议室2222', twelve: '', thirteen: '', fourteen: '1', fifteen: '1', sixteen: '1', seventeen: '1', eighteen:'1', }]共有1个答案
郗唯
如果没有看错的话，就是记录一下各会议室在某个小时段是否有开会。说一下解法。
前两个数据是一样的：
const thisDate = [ { date: "12", prop: "twelve", }, { date: "13", prop: "thirteen", }, { date: "14", prop: "fourteen", }, { date: "15", prop: "fifteen", }, { date: "16", prop: "sixteen", }, { date: "17", prop: "seventeen", }, { date: "18", prop: "eighteen", },];const data = [ { DATE: "2023-09-04 15:33:54.0", ROOMNAME: "测试会议室1", ROOMID: "001", }, { DATE: "2023-09-04 16:00:00", ROOMNAME: "测试会议室1", ROOMID: "001", }, { DATE: "2023-09-04 17:00:00", ROOMNAME: "测试会议室1", ROOMID: "001", }, { DATE: "2023-09-04 18:00:00", ROOMNAME: "测试会议室1", ROOMID: "001", }, { DATE: "2023-09-04 19:00:00", ROOMNAME: "测试会议室1", ROOMID: "001", }, { DATE: "2023-09-04 20:00:00", ROOMNAME: "测试会议室1", ROOMID: "001", }, { DATE: "2023-09-04 21:00:00", ROOMNAME: "测试会议室1", ROOMID: "001", }, { DATE: "2023-09-04 22:00:00", ROOMNAME: "测试会议室1", ROOMID: "001", }, { DATE: "2023-09-04 23:00:00", ROOMNAME: "测试会议室1", ROOMID: "001", }, { DATE: "2023-09-04 14:53:42.0", ROOMNAME: "会议室2222", ROOMID: "002", }, { DATE: "2023-09-04 15:00:00", ROOMNAME: "会议室2222", ROOMID: "002", }, { DATE: "2023-09-04 16:00:00", ROOMNAME: "会议室2222", ROOMID: "002", }, { DATE: "2023-09-04 17:00:00", ROOMNAME: "会议室2222", ROOMID: "002", }, { DATE: "2023-09-04 18:00:00", ROOMNAME: "会议室2222", ROOMID: "002", }, { DATE: "2023-09-04 19:00:00", ROOMNAME: "会议室2222", ROOMID: "002", }, { DATE: "2023-09-04 20:00:00", ROOMNAME: "会议室2222", ROOMID: "002", },];使用哈希表做一个前置处理，根据会议室名称进行分组，其值为该会议室开会的小时。
注意，此处比较随意。若是严谨一点，应当使用ROOMID作为key，value也应当使用Set作为容器，以免数据量大导致的重复问题。
const map = new Map();for (const { DATE, ROOMNAME } of data) { map.set(ROOMNAME, [...(map.get(ROOMNAME) ?? []), DATE.slice(11, 13)]);}最后遍历哈希表，与 thisDate 对照一下，即可得到结果：
const list = [];for (const [k, v] of map.entries()) { const obj = { name: k, }; for (const { prop, date } of thisDate) { obj[prop] = v.includes(date) ? "1" : ""; } list.push(obj);}console.log("生成新的数组对象");console.log(list);结果如下：
生成新的数组对象[ { name: '测试会议室1', twelve: '', thirteen: '', fourteen: '', fifteen: '1', sixteen: '1', seventeen: '1', eighteen: '1' }, { name: '会议室2222', twelve: '', thirteen: '', fourteen: '1', fifteen: '1', sixteen: '1', seventeen: '1', eighteen: '1' }]
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