对数组中的值进行分组

// 假设有一个包含学生信息的数组
const students = [
  { name: 'Alice', grade: 85 },
  { name: 'Bob', grade: 92 },
  { name: 'Charlie', grade: 78 },
  { name: 'David', grade: 85 },
  { name: 'Eve', grade: 92 }
];

// 创建一个以成绩为分组依据的对象
const gradeGroups = {};

// 遍历数组，将学生按照成绩分组
students.forEach(student => {
  const grade = student.grade;
  if (!gradeGroups[grade]) {
    gradeGroups[grade] = [];
  }
  gradeGroups[grade].push(student);
});

// 输出分组结果
for (const grade in gradeGroups) {
  console.log(`成绩为 ${grade} 的学生有：`);
  gradeGroups[grade].forEach(student => {
    console.log(student.name);
  });
}