javascript - 合并两个 json 数组

Question

我必须数组，我想通过相同的 id 将它们合并到一个数组中。所以每两个具有相同 id 的数组应该合并

案例1:

 { 
    "id":1212,
    "instructor":"william",
     ...
 }

案例2:

[ 
     {
        "id":1212,
        "name":"accounting",
         ...
     },
     { 
        "id":1212,
        "name":"finance",
        ...
     }
]

我需要的结果是:

{        
    "id": 1212,
    "instructor": "william",
    "Courses": [
         { 
            "id":1212,
            "name":"accounting",
             ...
         },
         { 
            "id":1212,
            "name":"finance",
             ...
         }
     ]
}

Answer 1

您要求的不是合并，但这是您可以做到这一点的方法。

const instructors = [{ "id":1212, "instructor":"william", }];
const courses = [ 
  { "id":1212, "name":"accounting" },
  { "id":1212, "name":"finance" }
];

const expected = [{ "id":1212, "instructor":"william", "courses": [
  { "id":1212, "name":"accounting" },
  { "id":1212, "name":"finance" }
]}];

const composed = instructors.map(ins => {
  const ret = {...ins};
  ret.courses = courses.filter(cou => cou.id === ins.id);
  return ret;
});

console.log(composed);