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在遵循流规则的同时通过匹配键合并两个对象

javascript

Jojo Narte · 技术社区 · 6 年前

假设我们给出了以下数据:

subjects = {
  student1: ['Math', 'Science'],
  student2: ['Math', 'Physics', 'English'],
};

students = {
 student1: {
    // other data
    subjectsList: [],
 },
 student2: {
    // other data
    subjectsList: [],
 },
};

const merge = (subjects: Object, students: Object) => {
    Object.keys(subjects).forEach((id: Object) => {
      const subjectsList = subjects[id];
      const student = students[id];

      if (student) {
        const updatedStudent = {
          ...student,
          subjectsList,
        };

        students[id] = updatedStudent;
      }
    });

    return students;
  };

这将导致流错误:

Cannot access the computed property using object type [1].

app/reducers/subjects.reducer.js:42:32
42|           const student = students[id];
                                   ^^

References:
app/reducers/subjects.reducer.js:40:48
40|         Object.keys(subjects).forEach((id: Object) => {
            ^^^^^^ [1]

1 回复 | 直到 6 年前

Romil 6 年前

Object.keys(subjects).forEach((id: Object)

这个 id .forEach((id) => 不是一个 ,但是 字符串

const merge = (subjects, students) => {
    Object.keys(subjects).forEach((id) => {
      const subjectsList = subjects[id];
      const student = students[id];

      if (stand) {
        const updatedStudent = {
          ...student,
          subjectsList,
        };

        students[id] = updatedStudent;
      }
    });

    return students;
  };

我想这会管用的。

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