typescript 打字稿将数组转换为 JSON
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Typescript convert an array to JSON
提问by Steven Scott
I have a complicated data structure that I need to convert to JSON. The problem is that my field names and values are in an array.
我有一个需要转换为 JSON 的复杂数据结构。问题是我的字段名称和值都在一个数组中。
For instance, I have the following (simplified from my code base):
例如，我有以下内容（从我的代码库中简化）：
let SampleData = [
{ Field: 'Key', Value: '7'},
{ Field: 'City', Value: 'Some City'},
{ Field: 'Description', Value: 'Some Description'}
];
Basically my data is an array where the first element is the database column name, and the second element is the data in the column. I am trying to get a JSON object that is:
基本上我的数据是一个数组，其中第一个元素是数据库列名，第二个元素是列中的数据。我正在尝试获取一个 JSON 对象：
{ Key: 7, City: 'Some City', Description: 'Some Description' }
My real code has the fields and data is structures within the object, so I cannot simply use an Object.create() or Object.assign() as far as I can get working.
我的真实代码具有对象中的字段和数据结构，因此我不能简单地使用 Object.create() 或 Object.assign() 就可以工作。
I have tried looping through to build a simple string and then use the JSON.parse to break it apart, but this seems like a lot of overhead for something I would have thought would be simpler.
我尝试循环构建一个简单的字符串，然后使用 JSON.parse 将其分解，但这对于我认为会更简单的东西来说似乎是很多开销。
回答by Maxime Gélinas
As you asked, here's how to do it:
正如你所问，这是如何做到的：
- Mapping the array to an object
- Converting the object to JSON
- 将数组映射到对象
- 将对象转换为 JSON
let array = [{
Field: 'Key',
Value: '7'
},
{
Field: 'City',
Value: 'Some City'
},
{
Field: 'Description',
Value: 'Some Description'
}
];
// #1 Mapping the array to an object...
let obj = {};
array.forEach(item => obj[item.Field] = item.Value);
// #2 Converting the object to JSON...
let json = JSON.stringify(obj);
console.log(json);Bonus (ES6 + reduce):
奖励（ES6 + 减少）：
const obj = array.reduce((acc, { Field, Value }) => ({ ...acc, [Field]: Value }), {});
回答by Niladri
you can try the below approach . I have used spread operator(ES6) and Object.assign to create the object ,then converted it into json string.
你可以试试下面的方法。我使用了扩展运算符（ES6）和 Object.assign 来创建对象，然后将其转换为 json 字符串。
let SampleData = [
{ Field: 'Key', Value: '7'},
{ Field: 'City', Value: 'Some City'},
{ Field: 'Description', Value: 'Some Description'}
];
let obj = Object.assign(...SampleData.map( x => Object.values(x)).map(y => ({[y[0]]: y[1]})));
console.log(obj);
//{ Key: "7", City: "Some City", Description: "Some Description" }
console.log(JSON.stringify(obj));回答by Irfan
I had a similar requirement and here is how I achieved it.
我有一个类似的要求，这是我实现它的方法。
var ranges: segmentRange[] = new Array(2);
ranges[0] = { minimumPercentage: 50, maximumPercentage: 60 };
ranges[1] = { minimumPercentage: 30, maximumPercentage: 40 };
const segmentRanges = { segmentRanges: ranges };
return JSON.stringify(segmentRanges);Output:
输出：
{"segmentRanges":[{"minimumPercentage":50,"maximumPercentage":60},{"minimumPercentage":30,"maximumPercentage":40}]}
{"segmentRanges":[{"minimumPercentage":50,"maximumPercentage":60},{"minimumPercentage":30,"maximumPercentage":40}]}
HTH,
哈，
