JavaScript编程题

编程题

查看答案：解决五个编程题的方法

1. 两个数组，最终输出：['员工张三，29岁，工作于百度', '员工李四，26岁，工作于阿里巴巴'，...]

   var employees = [
       {
           name: "张三", // 员工名字
           empId: 0, // 员工id
           age: 29, // 员工年龄
           compId: 1, // 所属公司id
       },
       {
           name: "李四",
           empId: 1,
           age: 26,
           compId: 2,
       },
       {
           name: "王五",
           empId: 2,
           age: 28,
           compId: 1,
       },
       {
           name: "小明",
           empId: 3,
           age: 32,
           compId: 3,
       },
   ];
   
   var companies = [
       {
           name: "百度", // 公司名称
           id: 1, // 公司id
       },
       {
           name: "阿里巴巴",
           id: 2,
       },
       {
           name: "腾讯",
           id: 3,
       },
   ];
   

2. 请把下列的数组变成是: [['苹果','胡萝卜', '花生'], ['梨', '西芹', '坚果']....]

   var basket = [
       { fruit: "苹果", veg: "胡萝卜", nut: "花生" },
       { fruit: "梨", veg: "西芹", nut: "坚果" },
       { fruit: "香蕉", veg: "土豆", nut: "杏仁" },
       { fruit: "西瓜", veg: "豆芽", nut: "核桃" },
   ];
   

3. 程序实现对数据统计其出现的次数并按出现次数进行排序，[1, 4, 2, 1, 3, 2, 1, 4] 作为参数（参数可变）传入js方法中，控制台输出如下结果

   1 出现了 3 次
   2 出现了 2 次
   4 出现了 2 次
   3 出现了 1 次
   

4. 实现二维数组行转列

   var arr = [
       ["前端", "3人", "8-15k", "本科"],
       ["后端", "5人", "10-25k", "研究生"],
       ["UI", "2人", "9-11k", "大专"],
       ["ETL工程师", "10人", "6-12k", "大专"],
   ];
   
   转换 =>
   
   var newArr = [
       ["前端", "后端", "UI", "ETL工程师"],
       ["3人", "5人", "2人", "10人"],
       ["8-15k", "10-25k", "9-11k", "6-12k"],
       ["本科", "研究生", "大专", "大专"],
   ];
   

5. 对以下数据 取出每人(name)最大的销售量(sales)数据 ( 对sales排序对name去重)

   var arr = [
       { name: "小明", year: 2019, sales: 53 },
       { name: "小明", year: 2020, sales: 234 },
       { name: "小明", year: 2018, sales: 24 },
       { name: "小强", year: 2019, sales: 31 },
       { name: "小强", year: 2020, sales: 567 },
       { name: "小强", year: 2018, sales: 678 },
       { name: "小红", year: 2019, sales: 465 },
       { name: "小红", year: 2020, sales: 82 },
       { name: "小红", year: 2018, sales: 576 },
       { name: "小马", year: 2019, sales: 4567 },
       { name: "小马", year: 2020, sales: 832 },
       { name: "小马", year: 2018, sales: 674 },
   ];