javascript - 如何从对象数组创建数组

Question

鉴于以下情况:

var example = [{
  "logged": {
    "status": 0,
    "status_name": "Logged",
    "hours": 23 // to the hours array
  },
  "pending": {
    "status": 3,
    "status_name": "Pending",
    "contribution": {
      "hours": 0,
      "count": 0
    },
    "verification": {
      "hours": 6, // to the hours array
      "count": 1
    }
  },
  "denied": {
    "status": 4,
    "status_name": "Denied",
    "contribution": {
      "hours": 0,
      "count": 0
    },
    "verification": {
      "hours": 0, // to the hours array
      "count": 0
    }
  },
  "approved": {
    "status": 2,
    "status_name": "Approved",
    "contribution": {
      "hours": 4.5,
      "count": 1
    },
    "verification": {
      "hours": 0, // to the hours array
      "count": 0
    }
  }
}];

我如何构造两 (2) 个数组，如下所示:

var statusNames = ["Logged", "Pending", "Denied", "Approved"];
var hours = [23, 6, 0, 0];

如果从解决方案中获取值，我可以推断如何获取其余部分。

Answer 1

您可以迭代数组和键，检查属性是否存在并将所需的部分包含到数组中。

var example = [{ "logged": { "status": 0, "status_name": "Logged", "hours": 23 }, "pending": { "status": 3, "status_name": "Pending", "contribution": { "hours": 0, "count": 0 }, "verification": { "hours": 6, "count": 1 } }, "denied": { "status": 4, "status_name": "Denied", "contribution": { "hours": 0, "count": 0 }, "verification": { "hours": 0, "count": 0 } }, "approved": { "status": 2, "status_name": "Approved", "contribution": { "hours": 4.5, "count": 1 }, "verification": { "hours": 0, "count": 0 } } }],
    statusNames = [],
    hours = [];

example.forEach(function (o) {
    Object.keys(o).forEach(function (k) {
        if ('hours' in o[k]) {
            statusNames.push(k);
            hours.push(o[k].hours);
            return;
        }
        if ('verification' in o[k]) {
            statusNames.push(k);
            hours.push(o[k].verification.hours);
        }
    });
});
console.log(statusNames);
console.log(hours);