javascript - 需要一种方法从对象数组中随机选取一个值而不遍历父对象

Question

我对 JavaScript 还很陌生，需要帮助来完成我想要完成的任务。

我有一个像这样的对象数组:

    const data =
{
    "Total_packages": {
        "package1": {
            "tags": [
                "kj21",
                "j1",
                "sj2",
                "z1"
            ],
            "expectedResponse": [
                {
                    "firstName": "Name",
                    "lastName": "lastName",
                    "purchase": [
                        {
                            "title": "title",
                            "category": [
                                "a",
                                "b",
                                "c"
                            ]
                        }
                    ]
                }
            ]
        },
        "package2": {
            "tags": [
                "s2",
                "dsd3",
                "mhg",
                "sz7"
            ],
            "expectedResponse": [
                {
                    "firstName": "Name1",
                    "lastName": "lastName1",
                    "purchase": [
                        {
                            "title": "title1",
                            "category": [
                                "a1",
                                "b1",
                                "c1"
                            ]
                        }
                    ]
                }
            ]
        },
        "package3": {
            "tags": [
                "s21",
                "dsd31",
                "mhg1",
                "sz71"
            ],
            "expectedResponse": [
                {
                    "firstName": "Name2",
                    "lastName": "lastName2",
                    "purchase": [
                        {
                            "title": "title2",
                            "category": [
                                "a2",
                                "b2",
                                "c2"
                            ]
                        }
                    ]
                }
            ]
        },
        "package4": {
            "tags": [
                "s22",
                "dsd32",
                "mhg2",
                "sz72"
            ],
            "expectedResponse": [
                {
                    "firstName": "Name3",
                    "lastName": "lastName3",
                    "purchase": [
                        {
                            "title": "title3",
                            "category": [
                                "a3",
                                "b3",
                                "c3"
                            ]
                        }
                    ]
                }
            ]
        },
        "package5": {
            "tags": [
                "s22",
                "dsd32",
                "mhg2",
                "sz72"
            ],
            "expectedResponse": [
                {
                    "firstName": "Name4",
                    "lastName": "lastName4",
                    "purchase": [
                        {
                            "title": "title4",
                            "category": [
                                "a4",
                                "b4",
                                "c4"
                            ]
                        }
                    ]
                }
            ]
        }
    }
}

    var arrRand = genNum(data, 3);
    console.log(arrRand);

               function genNum(data, loop='') {
                    var list = [];
                    var arrayOfTags = Object.entries(data.Total_packages).reduce((acc, [k, v]) => {
                        if (v.tags) acc = acc.concat(v.tags.map(t => ({tag: t, response: v.expectedResponse})));
                        return acc;
                    }, []);
                    for (var i = 0; i < loop; i++){
                      var randomIndex = Math.floor(Math.random() * arrayOfTags.length);
                    var randomTag = arrayOfTags[randomIndex];
                    list.push(randomTag);
                    }
                    return list;

        }

然后，我通过执行 arrRand[0].tag 和 arrRand[0].response 等操作来访问所需的值。

我经常从以下方法中得到重复的响应，这就会出现问题:

[
  {
    "tag": "s22",
    "response": [
      {
        "firstName": "Name4",
        "lastName": "lastName4",
        "purchase": [
          {
            "title": "title4",
            "category": [
              "a4",
              "b4",
              "c4"
            ]
          }
        ]
      }
    ]
  },
  {
    "tag": "dsd31",
    "response": [
      {
        "firstName": "Name2",
        "lastName": "lastName2",
        "purchase": [
          {
            "title": "title2",
            "category": [
              "a2",
              "b2",
              "c2"
            ]
          }
        ]
      }
    ]
  },
  {
    "tag": "dsd31",
    "response": [
      {
        "firstName": "Name2",
        "lastName": "lastName2",
        "purchase": [
          {
            "title": "title2",
            "category": [
              "a2",
              "b2",
              "c2"
            ]
          }
        ]
      }
    ]
  }
]

我的目标是发送带有上面随机“标签”值的 API 请求，然后将我从调用中获得的响应与数据的预期响应部分进行匹配。

我最初的想法是做类似的事情:

data.Total_packages.tags[Math.floor(Math.random() * data.Total_packages.tags.length)];

但是，我无法在不遍历其父级(即“package1”或“package2”)的情况下调用“tags”，因此它不再是随机的。

我知道可能有一种非常简单的方法可以做到这一点，但我没有得到。任何建议将不胜感激。

Answer 1

您可以从各种标签元素构建一个数组，并使用它来执行随机操作。

const data =
{
    "Total_packages": {
        "package1": {
            "tags": [
                "kj21",
                "j1",
                "sj2",
                "z1"
            ],
            "expectedResponse": [
                {
                    "firstName": "Name",
                    "lastName": "lastName",
                    "purchase": [
                        {
                            "title": "title",
                            "category": [
                                "a",
                                "b",
                                "c"
                            ]
                        }
                    ]
                }
            ]
        },
        "package2": {
            "tags": [
                "s2",
                "dsd3",
                "mhg",
                "sz7"
            ],
            "expectedResponse": [
                {
                    "firstName": "Name1",
                    "lastName": "lastName1",
                    "purchase": [
                        {
                            "title": "title1",
                            "category": [
                                "a1",
                                "b1",
                                "c1"
                            ]
                        }
                    ]
                }
            ]
        }
    }
}

const arrayOfTags = Object.entries(data.Total_packages).reduce((acc, [k, v]) => {
  if (v.tags) acc = acc.concat(v.tags.map(t => ({tag: t, response: v.expectedResponse})));
  return acc;
}, []);

const randomIndex = Math.floor(Math.random() * arrayOfTags.length);

const randomTag = arrayOfTags[randomIndex];

console.log(randomTag.tag, randomTag.response);