Json Object Array：用它们的值替换'key'名称以避免相同的键名和易于检索答案

【问题标题】：Json Object Array:replacing 'key' names with their values to avoid same key name and easy retrievalJson Object Array：用它们的值替换'key'名称以避免相同的键名和易于检索
【发布时间】：2020-03-04 05:53:55
【问题描述】：

我有一个这样的 json 对象数组：

[
    {
        "entity": "clientModal",
        "value": "MacBook"
    },
    {
        "entity": "siteName",
        "value": "abde"
    },
    {
        "entity": "clientModal",
        "value": "MacBook"
    },
    {
        "entity": "siteName",
        "value": "abcd"
    },
    {
        "entity": "clientName",
        "value": "ghe-1202m"
    },
    {
        "entity": "timePeriod",
        "value": "week"
    },
    {
        "entity": "clientName",
        "value": "ghe-1202m"
    },
    {
        "entity": "timePeriod",
        "value": "week"
    },
    {
        "entity": "clientName",
        "value": "ghe-1202m"
    },
    {
        "entity": "clientName",
        "value": "ppphone"
    },
    {
        "entity": "clientName",
        "value": "pppiphone"
    }
]

我希望键“实体”在任何地方都应替换为其值，并且键“值”必须在其中。像这样：

[ { “客户名称”： { “价值”：“ppiphone” } } ]

我尝试了 evreything，但仍然没有找到任何东西。

【问题讨论】：

标签： node.js json arrayobject

【解决方案1】：

您需要映射数组并创建一个新对象，其中entity 值将用作键的名称。

const arrays = [
    {
        "entity": "clientModal",
        "value": "MacBook"
    },
    {
        "entity": "siteName",
        "value": "abde"
    },
    {
        "entity": "clientModal",
        "value": "MacBook"
    },
    {
        "entity": "siteName",
        "value": "abcd"
    },
    {
        "entity": "clientName",
        "value": "ghe-1202m"
    },
    {
        "entity": "timePeriod",
        "value": "week"
    },
    {
        "entity": "clientName",
        "value": "ghe-1202m"
    },
    {
        "entity": "timePeriod",
        "value": "week"
    },
    {
        "entity": "clientName",
        "value": "ghe-1202m"
    },
    {
        "entity": "clientName",
        "value": "ppphone"
    },
    {
        "entity": "clientName",
        "value": "pppiphone"
    }
];

const mappedArray = arrays.map(arr => ({
   [arr.entity]: {
     value: arr.value
   }
}));

console.log(mappedArray);

【讨论】：

【解决方案2】：

让我们尝试一些不为输出创建新数组的方法。只需修改现有的：

for (let i = 0; i < arrays.length; i++) {
    arrays[i] = {
        [arrays[i].entity]: {
            value: arrays[i].value
        }
    }
}

console.log(arrays)

【讨论】：

【解决方案3】：

遵循非常基本的循环方法。

var a = [
    {
        "entity": "clientModal",
        "value": "MacBook"
    },
    {
        "entity": "siteName",
        "value": "abde"
    },
    {
        "entity": "clientModal",
        "value": "MacBook"
    }
];
var finalArray = []
for(let i = 0; i < a.length; i++) {
    let s =`{ "${a[i].entity}": { "value": "${a[i].value}" } }`;
    finalArray.push(JSON.parse(s));
}

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

输出：

[{"clientModal":{"value":"MacBook"}},{"siteName":{"value":"abde"}},{"clientModal":{"value":"MacBook"}}]

【讨论】：