Need a way to randomly pick a value from an array of objects without traversing the parent-CodePudding

I am still fairly new to JavaScript and need help with a task I am trying to accomplish.

I have an array of objects like this:

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"
                            ]
                        }
                    ]
                }
            ]
        }
    }
}

My goal is to send API requests with a random "tags" value from above and then match the response I get from the call to the expectedResponse part of the data.

My initial thought was to do something like:

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

However, I can't call on "tags" without traversing through its parent i.e "package1" or "package2", so then it won't be random anymore.

I know there is probably a very simple way to do it that I am not getting. Any advice would be appreciated.

CodePudding user response：

You could build an array from the various tags elements, and use that to do random things.

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);
  return acc;
}, []);

console.log(arrayOfTags);
console.log(arrayOfTags[Math.floor(Math.random() * arrayOfTags.length)]);

CodePudding user response：

You will need to mine the tags, put them together into an array and randomize the index, finally get the value there. The solution below assumes that your tags are all arrays inside data.Total_packages[whateverpackage]

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"
                            ]
                        }
                    ]
                }
            ]
        }
    }
}

let tags = [];
for (let key in data.Total_packages) {
    if (data.Total_packages[key].tags) tags = tags.concat(data.Total_packages[key].tags);
}
console.log(tags[parseInt(tags.length * Math.random())]);