【问题标题】：Convert array values to object keys将数组值转换为对象键
【发布时间】：2017-08-25 12:12:39
【问题描述】：

我做了一个 get ，它返回一个像这样的 json 对象：

"data": [
  [
    "2016 Pass/Fail Rates by Test Centre",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    ""
  ],
  [
    "",
    "Passes",
    "",
    "No ID",
    "",
    "Fails",
    "",
    "Fail Dangerous",
    "",
    "Total"
  ],
  [
    "Sometown",
    "8,725",
    "53.40%",
    "140",
    "0.90%",
    "7,417",
    "45.40%",
    "48",
    "0.30%",
    "16,330"
  ],
  [
    "Some Other Town",
    "12,778",
    "44.80%",
    "193",
    "0.70%",
    "15,422",
    "54.10%",
    "103",
    "0.40%",
    "28,496"
  ],
  [...many more identically formatted arrays...]

我想最终得到：

[{
    "Location": "Sometown",
    "Passes": 8,
    725,
    "Pass%": 53.40 % ,
    "No ID": 140,
    "NoID%": 0.90 % ,
    "Fails": 7,
    417,
    "Fail%": 45.40 % ,
    "Fail Dangerous": 48,
    "FailDangerous%": 0.30 % ,
    "Total": 16,
    330
  }, {
    "Location": "Some Other Town",
    "Passes": 8,
    725,
    etc etc...

所以我想忽略“数据”数组中的第一个数组，使用第二个数组的值作为键（并用更有用的东西替换空字符串）并将所有剩余数组中的值作为结果中的值对象。

所以这是一个相当多的问题，尽管我怀疑一个相当简单的问题。最简单的方法是什么 - 如果不同，在处理/页面加载方面最精简的方法是什么？

提前致谢，

【问题讨论】：

标签： javascript arrays object javascript-objects

【解决方案1】：

您可以将第二个数组作为所需对象的键，并仅迭代键之后的部分。然后迭代键并为数组的值构建一个新对象。返回用于映射新数组的对象。

var data = { data: [["2016 Pass/Fail Rates by Test Centre", "", "", "", "", "", "", "", "", ""], ["Location", "Passes", "Passes%", "No ID", "No ID%", "Fails", "Fails%", "Fail Dangerous", "Fail Dangerous%", "Total"], ["Sometown", "8,725", "53.40%", "140", "0.90%", "7,417", "45.40%", "48", "0.30%", "16,330"], ["Some Other Town", "12,778", "44.80%", "193", "0.70%", "15,422", "54.10%", "103", "0.40%", "28,496"]] },
    keys = data.data[1],
    result = data.data.slice(2).map(function (a) {
        var temp = {};
        keys.forEach(function (k, i) {
            temp[k] = a[i];
        })
        return temp;
    });
    
console.log(result);

.as-console-wrapper { max-height: 100% !important; top: 0; }

【讨论】：

@Nina-Scholz，好主意，非常感谢！ https://stackoverflow.com/questions/45678565/how-to-map-many-arrays-values-that-have-same-construct-to-an-object

【解决方案2】：

您可以在将索引和值添加到对象中时遍历数组...

您可以找到一个关于如何迭代对象和数组的示例here 和一个示例here

Generally, to add an item to object

var array = [{"Location":"Sometown"}, {"Location2":"Sometown2"},    {"Location3":"Sometown3"}],
object = {};
array.forEach(function(element, index) {
    object[index] = element;
});
console.log(object);

【讨论】：

【解决方案3】：

这是我的解决方案，希望对您和任何对此问题有同样困惑的人有用！

你应该构造一个有意义的对象！

const meaningful_objs = {
    "Location": "",
    "Passes": "",
    "Passes%": "",
    "No ID": "",
    "No ID%": "", 
    "Fails": "",
    "Fails%": "",
    "Fail Dangerous": "",
    "Fail Dangerous%": "",
    "Total": ""
};

// or get it from you data[1], 
// but I think it has some errors of you got returned data!
// It should be have all keys!

// just make a assume, you get the right data[1]!

const data[1] = ["Location", "Passes", "Passes%", "No ID", "No ID%", "Fails", "Fails%", "Fail Dangerous", "Fail Dangerous%", "Total"]; 

let keys = data[1];

/*

Array to Object

*/




// ["Location", "Passes", "Passes%", "No ID", "No ID%", "Fails", "Fails%", "Fail Dangerous", "Fail Dangerous%", "Total"]

const keys_array = [
    "Location",
    "Passes",
    "Passes%",
    "No ID",
    "No ID%", 
    "Fails",
    "Fails%",
    "Fail Dangerous",
    "Fail Dangerous%",
    "Total"
];

let temp_obj = {};

keys_array.map(
    (value, index) => {
        temp_obj[`${value}`] = "";
        // temp_obj[value] = "";
        return temp_obj;
    }
);

console.log(`temp_obj = `, temp_obj);
// {"Location": "","Passes": "","Passes%": "","No ID": "","No ID%": "", "Fails": "","Fails%": "","Fail Dangerous": "","Fail Dangerous%": "","Total": ""};



for(let k in temp_obj) {
    console.log(`typeof (k) = `, typeof (k));
    // typeof (k) = string
}




/*

Object to Array

*/


const meaningful_objs = {
    "Location": "",
    "Passes": "",
    "Passes%": "",
    "No ID": "",
    "No ID%": "", 
    "Fails": "",
    "Fails%": "",
    "Fail Dangerous": "",
    "Fail Dangerous%": "",
    "Total": ""
};

// {"Location": "","Passes": "","Passes%": "","No ID": "","No ID%": "", "Fails": "","Fails%": "","Fail Dangerous": "","Fail Dangerous%": "","Total": ""};




let keys_array = Object.keys(meaningful_objs);

console.log(`keys_array = \n`, keys_array);

// ["Location", "Passes", "Passes%", "No ID", "No ID%", "Fails", "Fails%", "Fail Dangerous", "Fail Dangerous%", "Total"]






/*

result 

*/



let keys = keys_array;
// ["Location", "Passes", "Passes%", "No ID", "No ID%", "Fails", "Fails%", "Fail Dangerous", "Fail Dangerous%", "Total"]


let arrays = [
    [
        "Sometown",
        "8,25",
        "53.40%",
        "140",
        "0.90%",
        "7,17",
        "45.40%",
        "48",
        "0.30%",
        "16,30"
    ],
    [
        "Some Other Town",
        "12,78",
        "44.80%",
        "193",
        "0.70%",
        "15,22",
        "54.10%",
        "103",
        "0.40%",
        "28,96"
    ]
];

let result = arrays.map(
    (array) => {
        let temp = {};
        keys.forEach(
            (key, index) => {
                console.log(`key = `, key);
                console.log(`index = `, index);
                temp[`${key}`] = array[index];
            }
        );
        console.log(`temp = `, temp);
        return temp;
    }
);
console.log(`result = `, result);



/*

test

*/


let string_objs = JSON.stringify(result);

// "[{"Location":"Sometown","Passes":"8,25","Passes%":"53.40%","No ID":"140","No ID%":"0.90%","Fails":"7,17","Fails%":"45.40%","Fail Dangerous":"48","Fail Dangerous%":"0.30%","Total":"16,30"},{"Location":"Some Other Town","Passes":"12,78","Passes%":"44.80%","No ID":"193","No ID%":"0.70%","Fails":"15,22","Fails%":"54.10%","Fail Dangerous":"103","Fail Dangerous%":"0.40%","Total":"28,96"}]"


let string_obj1 = JSON.stringify(result[0]);

// "{"Location":"Sometown","Passes":"8,25","Passes%":"53.40%","No ID":"140","No ID%":"0.90%","Fails":"7,17","Fails%":"45.40%","Fail Dangerous":"48","Fail Dangerous%":"0.30%","Total":"16,30"}"


/*


    {
        "Location":"Sometown",
        "Passes":"8,25",
        "Passes%":"53.40%",
        "No ID":"140",
        "No ID%":"0.90%",
        "Fails":"7,17",
        "Fails%":"45.40%",
        "Fail Dangerous":"48",
        "Fail Dangerous%":"0.30%",
        "Total":"16,30"
    }

*/


let string_obj2 = JSON.stringify(result[1]);


// "{"Location":"Some Other Town","Passes":"12,78","Passes%":"44.80%","No ID":"193","No ID%":"0.70%","Fails":"15,22","Fails%":"54.10%","Fail Dangerous":"103","Fail Dangerous%":"0.40%","Total":"28,96"}"


/*

    {
        "Location":"Some Other Town",
        "Passes":"12,78",
        "Passes%":"44.80%",
        "No ID":"193",
        "No ID%":"0.70%",
        "Fails":"15,22",
        "Fails%":"54.10%",
        "Fail Dangerous":"103",
        "Fail Dangerous%":"0.40%",
        "Total":"28,96"
    }


*/

【讨论】：

stackoverflow.com/questions/45678565/…
你为什么大喊大叫？