javascript - 将特定数组元素复制到现有对象(覆盖)

Question

我有以下对象

var obj1 = 
[
    {
        "id": 1373744172,
        "name": "Run",
        "distance": 6051.8,
        "date": "2018-01-24T16:43:09Z",
    },
    {
        "id": 1370355715,
        "name": "Swim",
        "distance": 1043,
        "date": "2018-01-22T21:10:28Z",
    }
]

var dest = 
[
    {title: "Placeholder", body: "1900-01-01T00:00:00Z"}
]

我正在尝试基于 obj1 覆盖 dest，所以我最终应该得到

[
    {title: "Run", body: "2018-01-24T16:43:09Z"},
    {title: "Swim", body: "2018-01-22T21:10:28Z"}
]

我已经研究过 Object.assign 和 for-in 循环，但我还没有找到正确的方法。例如

var obj1 = 
[
    {
        "id": 1373744172,
        "name": "Run",
        "distance": 6051.8,
        "date": "2018-01-24T16:43:09Z",
    },
    {
        "id": 1370355715,
        "name": "Swim",
        "distance": 1043,
        "date": "2018-01-22T21:10:28Z",
    }
]

var dest = 
[
    {title: "Placeholder", body: "1900-01-01T00:00:00Z"}
]

Object.assign(dest, {title: obj1.name, body: obj1.date});

console.log(JSON.stringify(dest));

我确信这个问题之前一定有人问过并回答过，但我似乎没有使用正确的术语进行搜索!

Answer 1

您不需要Object.assign，使用array.prototype.map来转换数组的每个元素:

var obj1 = 
[
    {
        "id": 1373744172,
        "name": "Run",
        "distance": 6051.8,
        "date": "2018-01-24T16:43:09Z",
    },
    {
        "id": 1370355715,
        "name": "Swim",
        "distance": 1043,
        "date": "2018-01-22T21:10:28Z",
    }
];

var dest = obj1.map(e => ({title: e.name , body: e.date}));

console.log(dest);