基于技能Java语言创建名称映射

Question

我对使用javascript零经验，真的可以使用一些帮助。照原样，这也是我第一次在堆栈上发帖。

我有以下学生列表：

var student = [{
    id: 0,
    name: "John",
    skills: ["javascript", "html", "css", "c#"]
  },
  {
    id: 1,
    name: "Brian",
    skills: ["javascript", "java", "c", "c#", "c++", "html"]
  },
  {
    id: 2,
    name: "Michael",
    skills: ["c", "c++", "go", "rust"]
  }
];

说明将返回以下按组排序的名称：

  "c": ["Brian", "Michael"],
  "c#": ["John", "Brian"],
  "c++": ["Brian", "Michael"],
  "css": ["John"],
  "go": ["Michael"],
  "html": ["John", "Brian"],
  "java": ["Brian"],
  "javascript": ["John", "Brian"],
  "rust": ["Michael"]
};

到目前为止我尝试过的是：

function skills(student)
{

      var result = student.reduce(function(map, obj) {
        map[obj.skills] = obj.name;
        return map;
      }, {});
      console.log(result2);
}

skills(student);

输出越来越接近预期，但我遇到了麻烦，可能需要一些帮助。

{ 'javascript,html,css,c#': 'John',
  'javascript,java,c,c#,c++,html': 'Brian',
  'c,c++,go,rust': 'Michael' }

Answer 1

迭代skills中的每个reduce。测试以查看要迭代的技能是否首先在地图中。如果不是，请将其值设置为空数组。然后，将学生的姓名推送到它：

var student = [{
    id: 0,
    name: "John",
    skills: ["javascript", "html", "css", "c#"]
  },
  {
    id: 1,
    name: "Brian",
    skills: ["javascript", "java", "c", "c#", "c++", "html"]
  },
  {
    id: 2,
    name: "Michael",
    skills: ["c", "c++", "go", "rust"]
  }
];

function skills(student) {
  return student.reduce(function(map, { name, skills }) {
    skills.forEach((skill) => {
      if (!map[skill]) {
        map[skill] = [];
      }
      map[skill].push(name);
    });
    return map;
  }, {});
}

console.log(skills(student));

Answer 2

function groupBySkill(list) {
    const regrouped = list.reduce((acc, cur) => {
        cur.skills.forEach((skill) => {
            if (acc[skill] === undefined) {
                acc[skill] = [];
            }

            acc[skill].push(cur.name);
        });

        return acc;
    }, {});

    return regrouped;
}

Answer 3

您可以先使用.forEach遍历学生，然后再使用另一个内部.forEach遍历技能，并将学生的姓名存储在返回对象基于键的数组中：

var students = [{ id: 0, name: "John", skills: ["javascript", "html", "css", "c#"] }, { id: 1, name: "Brian", skills: ["javascript", "java", "c", "c#", "c++", "html"] }, { id: 2, name: "Michael", skills: ["c", "c++", "go", "rust"] } ];

function skills(students) {
  var obj = {}
  students.forEach(s => {
    s.skills.forEach(sk => {
      if (!obj[sk]) obj[sk] = [];
      obj[sk].push(s.name);
    });
  });
  return obj;
}


console.log(skills(students));