Question

我有一个Map<String, List<Object>>，我想将其转换为JSON。

这里是我所拥有的：
要点1：声明变量

var map = new Map(), //map
jsonObject= {}, // oject that needs to be converted to JSON
value1 = { topic: "someText1", status: "0", action: "1", comment: "someComment1" }, // values of Map
value2 = { topic: "someText2", status: "0", action: "0", comment: "someComment2" },
value3 = { topic: "someText3", status: "1", action: "1", comment: "someComment3" };

要点2：用于填充多值地图的功能

function populateMap(map, k, v) {
    map[k] = map[k] || [];
    map[k].push(v);
}

要点3：填充地图
//映射键是网页中各种属性的连接，以 |

分隔

populateMap(map, 'release|attachment|license1', value1);
populateMap(map, 'release|attachment|license1', value2);
populateMap(map, 'release1|attachment1|license1', value1);
populateMap(map, 'release1|attachment1|license2', value2);
populateMap(map, 'release1|attachment1|license3', value3);
populateMap(map, 'release2|attachment2|license2', value1);
populateMap(map, 'release2|attachment2|license2', value2);

第4点：迭代地图并填充jsonObject

for (var i in map) {
    var keys = i.split('|'), // splitting keys based on |
    last = keys.pop(),
    values = map[i];
    values.forEach(function (item, index) {
        keys.reduce((r, a) => r[a] = r[a] || {}, jsonObject)[last] = item;
    });
}

第5点：当前输出（在控制台上打印jsonObject）

{
  "release": {
    "attachment": {
      "license1": "[Object]"
    }
  },
  "release1": {
    "attachment1": {
      "license1": "[Object]",
      "license2": "[Object]",
      "license3": "[Object]"
    }
  },
  "release2": {
    "attachment2": {
      "license2": "[Object]"
    }
  }
}

第6点：预期输出（jsonObject）

{
  "release": {
    "attachment": {
      "license1": "[Object, Object]" // expecting array of objects here ^^
    }
  },
  "release1": {
    "attachment1": {
      "license1": "[Object]",
      "license2": "[Object]",
      "license3": "[Object]"
    }
  },
  "release2": {
    "attachment2": {
      "license2": "[Object, Object]"
    }
  }
}

^^由于map的键具有对象数组，因此我想在jsonObject中具有对象数组。

有人需要帮我做一下调整，以第4点遍历map以获得预期的结果吗？

Answer 1

您使用.set，.get，.has和.delete之类的方法与Map进行交互；将其元素设置为属性是不正确的。

function populateMap(map, k, v) {
    let values = map.get(k);

    if (values === undefined) {
        map.set(k, values = []);
    }

    values.push(v);
}

然后遍历地图，如下所示：

const jsonObject = {};

for (const [key, values] of map) {
    setPath(jsonObject, key.split('|'), values);
}

和您的setPath实现几乎相同：

function setPath(obj, [...keys], item) {
    const last = keys.pop();
    keys.reduce((r, a) => r[a] = r[a] || {}, obj)[last] = item;
}

toto：

function populateMap(map, k, v) {
    let values = map.get(k);

    if (values === undefined) {
        map.set(k, values = []);
    }

    values.push(v);
}

function setPath(obj, [...keys], item) {
    const last = keys.pop();
    keys.reduce((r, a) => r[a] = r[a] || {}, obj)[last] = item;
}

const map = new Map();

populateMap(map, 'release|attachment|license1', 'value1');
populateMap(map, 'release|attachment|license1', 'value2');
populateMap(map, 'release1|attachment1|license1', 'value1');
populateMap(map, 'release1|attachment1|license2', 'value2');
populateMap(map, 'release1|attachment1|license3', 'value3');
populateMap(map, 'release2|attachment2|license2', 'value1');
populateMap(map, 'release2|attachment2|license2', 'value2');

const jsonObject = {};

for (const [key, values] of map) {
    setPath(jsonObject, key.split('|'), values);
}

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

在JavaScript中将多值Map <String，Object []>转换为json

1 个答案: