如何将对象数组转换为带有键的数组数组答案

【问题标题】：How to convert the array of objects to array of array with keys如何将对象数组转换为带有键的数组数组
【发布时间】：2021-02-17 21:26:54
【问题描述】：

我需要将数组对象转换为数组数组，其每个对象项的对象键如下

var inputData = [{"0":420,"10":373,"20":340,"30":313,"40":293,"50":273,"60":259,"70":243},
                 {"0":620,"10":550,"20":500,"30":460,"40":430,"50":400,"60":378,"70":355},
                 {"0":820,"10":727,"20":660,"30":607,"40":567,"50":527,"60":497,"70":467}]

对象的上述输入数据具有一组带有键的值，输出数组应如下所示。

var outputData = [[
                  [0,420],[10,373],[20,340],[30,313],[40,293],[50,273],[60,259],[70,243]
                 ],
                 [
                  [0,620],[10,550],[20,500],[30,460],[40,430],[50,400],[60,378],[70,355]
                 ],
                 [
                  [0,820],[10,727],[20,660],[30,607],[40,567],[50,527],[60,497],[70,467]
                 ]]

我为每个循环编写了一个如下代码，它在单个数组中返回整个值

var inputData = [{"0":420,"10":373,"20":340,"30":313,"40":293,"50":273,"60":259,"70":243}, {"0":620,"10":550,"20":500,"30":460,"40":430,"50":400,"60":378,"70":355},                 {"0":820,"10":727,"20":660,"30":607,"40":567,"50":527,"60":497,"70":467}];

var sp = Object.keys(inputData[0])
let outputData = []
inputData.forEach(i => {
  sp.forEach(element => {
    outputData.push([parseInt(element), i[element]])
  });
})
console.log(outputData)

【问题讨论】：

我给你做了一个sn-p。我更改了 console.log(outputData)

标签： javascript node.js arrays object

【解决方案1】：

在带有Object.entries（易于填充）的现代环境中，这非常简单：您使用map 并在每个对象上使用Object.entries；然后将密钥转换为数字：

const result = inputData.map(obj => Object.entries(obj).map(([key, value]) => [+key, value]));

现场示例：

var inputData = [{"0":420,"10":373,"20":340,"30":313,"40":293,"50":273,"60":259,"70":243},
                 {"0":620,"10":550,"20":500,"30":460,"40":430,"50":400,"60":378,"70":355},
                 {"0":820,"10":727,"20":660,"30":607,"40":567,"50":527,"60":497,"70":467}];
                 
const result = inputData.map(obj => Object.entries(obj).map(([key, value]) => [+key, value]));
console.log(result);

请注意，使用一元 + 只是将字符串转换为数字的一种方法。在my answer here 中，我会介绍您的各种选择以及它们的优缺点。

【讨论】：

@NinaScholz - 我忘了转换密钥，但在一分钟前就做到了。

【解决方案2】：

您可以映射对象的条目并将所有值转换为数字。

var inputData = [{ 0: 420, 10: 373, 20: 340, 30: 313, 40: 293, 50: 273, 60: 259, 70: 243 }, { 0: 620, 10: 550, 20: 500, 30: 460, 40: 430, 50: 400, 60: 378, 70: 355 },{ 0: 820, 10: 727, 20: 660, 30: 607, 40: 567, 50: 527, 60: 497, 70: 467 }],
    result = inputData.map(o => Object.entries(o).map(a => a.map(Number)));

console.log(result);

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【讨论】：

【解决方案3】：

您可以使用Object.entries 从对象生成[key, value] 对。

var inputData = [{"0":420,"10":373,"20":340,"30":313,"40":293,"50":273,"60":259,"70":243}, {"0":620,"10":550,"20":500,"30":460,"40":430,"50":400,"60":378,"70":355},                 {"0":820,"10":727,"20":660,"30":607,"40":567,"50":527,"60":497,"70":467}];


const output = inputData.map((item) => Object.entries(item)).map((item) => item.map(([key, value]) => ([+key, +value])));
console.log(output);

【讨论】：