基于子数组映射父数组

const parentArray = [{ id: 1, name: 'Alice' }, { id: 2, name: 'Bob' }];
const childArray = [{ id: 1, age: 25 }, { id: 2, age: 30 }];

const mappedArray = parentArray.map(parent => {
  const child = childArray.find(child => child.id === parent.id);
  return { ...parent, age: child.age };
});

console.log(mappedArray);
// 输出: [{ id: 1, name: 'Alice', age: 25 }, { id: 2, name: 'Bob', age: 30 }]

const parentArray = [{ id: 1, name: 'Alice' }, { id: 2, name: 'Bob' }];
const childArray = [{ parentId: 1, hobby: 'reading' }, { parentId: 1, hobby: 'swimming' }, { parentId: 2, hobby: 'gaming' }];

const mappedArray = parentArray.map(parent => {
  const hobbies = childArray.filter(child => child.parentId === parent.id).map(child => child.hobby);
  return { ...parent, hobbies };
});

console.log(mappedArray);
// 输出: [{ id: 1, name: 'Alice', hobbies: ['reading', 'swimming'] }, { id: 2, name: 'Bob', hobbies: ['gaming'] }]