根据常见ID合并两个数组

如何解决根据常见ID合并两个数组

我有我要传递classid的这样的函数

  selectedSubjects;
  classnamewithid;
  subjectNameByID;

  selectClass(selectedClass) {
          

    this.selectedSubjects = this.topicWithClassSubjectList.filter(
      (topic) => topic.class_id === selectedClass
    ); // to filter out class with same id
   

    const groups = this.selectedSubjects.reduce((acc,cur) => {
      (acc[cur.subject_id] = acc[cur.subject_id] || []).push(cur.topic_name);
      return acc;
    },{}); // to group the array according to subject
   
// checkpoint#1
    this.selectedSubjects = Object.keys(groups).map((key) => ({
      subject_id: key,topics: groups[key],}));

  }

我的班级列表数组是这样的

{class_id: 1871,class_name: "1st"},{class_id: 1872,class_name: "2nd"},

检查点#1之后的selectedSubjects的最终数组是

[{"subject_id":"551","topics":["Evolution"]},{"subject_id":"711","topics":["Vector"]}]

我想要的selectedSubjects数组中要有一个与每个subject_id相关联的subjectName。我有一个SubjectId的数组,其SubjectName为:

{class_id: 2711,subject_id: 551,subject_name: "Biology"}

我希望selectedSubjects数组看起来像这样

[{“ subject_id”:“ 551”,“ subject_name”:“生物学”,主题“:[”进化“]},{” subject_id“:” 711“,” subject_name“:”科学“,”主题“:[” Vector“]}]

解决方法

没有一个简单的例子,我不确定您的数据是什么样子,但是根据描述,类似的东西应该可以工作。

const subjectsToTopics = [{
  subject_id: 551,topics: ["Evolution"]
},{
  subject_id: 711,topics: ["Vector"]
}];
const classList = [{
    class_id: 1871,class_name: "1st"
  },{
    class_id: 1872,class_name: "2nd"
  },];
const topicWithClassSubjectList = [{
    class_id: 1871,subject_id: 551,subject_name: "Biology"
  },subject_name: "Biology"
  }
];

function selectClass(selectedClass) {
  const classnamewithid = classList.find(
    (classes) => classes.class_id === selectedClass
  ); // to get the class name and class ID of selected class

  if (classnamewithid === null) {
    throw Error(`Class with id ${selectedClass} not found`);
  }

  const selectedSubjects = topicWithClassSubjectList.filter(
    (topic) => topic.class_id === selectedClass
  ); // to filter out class with same id


  return selectedSubjects.map((subject) => ({
    subject_id: subject.subject_id,subject_name: subject.subject_name,topics: subjectsToTopics
      .filter((entry) => entry.subject_id == subject.subject_id)
      .map((entry) => entry.topics)
      .flat()
  }));
}

console.log(selectClass(1871));
console.log(selectClass(1872));

请注意,您不会在任何地方使用classnamewithid,因此可以将其删除。

版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。

相关推荐


使用本地python环境可以成功执行 import pandas as pd import matplotlib.pyplot as plt # 设置字体 plt.rcParams['font.sans-serif'] = ['SimHei'] # 能正确显示负号 p
错误1:Request method ‘DELETE‘ not supported 错误还原:controller层有一个接口,访问该接口时报错:Request method ‘DELETE‘ not supported 错误原因:没有接收到前端传入的参数,修改为如下 参考 错误2:cannot r
错误1:启动docker镜像时报错:Error response from daemon: driver failed programming external connectivity on endpoint quirky_allen 解决方法:重启docker -> systemctl r
错误1:private field ‘xxx‘ is never assigned 按Altʾnter快捷键,选择第2项 参考:https://blog.csdn.net/shi_hong_fei_hei/article/details/88814070 错误2:启动时报错,不能找到主启动类 #
报错如下,通过源不能下载,最后警告pip需升级版本 Requirement already satisfied: pip in c:\users\ychen\appdata\local\programs\python\python310\lib\site-packages (22.0.4) Coll
错误1:maven打包报错 错误还原:使用maven打包项目时报错如下 [ERROR] Failed to execute goal org.apache.maven.plugins:maven-resources-plugin:3.2.0:resources (default-resources)
错误1:服务调用时报错 服务消费者模块assess通过openFeign调用服务提供者模块hires 如下为服务提供者模块hires的控制层接口 @RestController @RequestMapping("/hires") public class FeignControl
错误1:运行项目后报如下错误 解决方案 报错2:Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.1:compile (default-compile) on project sb 解决方案:在pom.
参考 错误原因 过滤器或拦截器在生效时,redisTemplate还没有注入 解决方案:在注入容器时就生效 @Component //项目运行时就注入Spring容器 public class RedisBean { @Resource private RedisTemplate<String
使用vite构建项目报错 C:\Users\ychen\work>npm init @vitejs/app @vitejs/create-app is deprecated, use npm init vite instead C:\Users\ychen\AppData\Local\npm-
参考1 参考2 解决方案 # 点击安装源 协议选择 http:// 路径填写 mirrors.aliyun.com/centos/8.3.2011/BaseOS/x86_64/os URL类型 软件库URL 其他路径 # 版本 7 mirrors.aliyun.com/centos/7/os/x86
报错1 [root@slave1 data_mocker]# kafka-console-consumer.sh --bootstrap-server slave1:9092 --topic topic_db [2023-12-19 18:31:12,770] WARN [Consumer clie
错误1 # 重写数据 hive (edu)> insert overwrite table dwd_trade_cart_add_inc > select data.id, > data.user_id, > data.course_id, > date_format(
错误1 hive (edu)> insert into huanhuan values(1,'haoge'); Query ID = root_20240110071417_fe1517ad-3607-41f4-bdcf-d00b98ac443e Total jobs = 1
报错1:执行到如下就不执行了,没有显示Successfully registered new MBean. [root@slave1 bin]# /usr/local/software/flume-1.9.0/bin/flume-ng agent -n a1 -c /usr/local/softwa
虚拟及没有启动任何服务器查看jps会显示jps,如果没有显示任何东西 [root@slave2 ~]# jps 9647 Jps 解决方案 # 进入/tmp查看 [root@slave1 dfs]# cd /tmp [root@slave1 tmp]# ll 总用量 48 drwxr-xr-x. 2
报错1 hive> show databases; OK Failed with exception java.io.IOException:java.lang.RuntimeException: Error in configuring object Time taken: 0.474 se
报错1 [root@localhost ~]# vim -bash: vim: 未找到命令 安装vim yum -y install vim* # 查看是否安装成功 [root@hadoop01 hadoop]# rpm -qa |grep vim vim-X11-7.4.629-8.el7_9.x
修改hadoop配置 vi /usr/local/software/hadoop-2.9.2/etc/hadoop/yarn-site.xml # 添加如下 <configuration> <property> <name>yarn.nodemanager.res