在JavaScript中使用Map更改数组 [英] Changing arrays using map in javascript

问题描述

这是我的json对象:

This is my json object:

{
   "id": 2,
   "service": "mobile",
   "min": "20",
   "per": "10",
   "tax": "1",
   "categoryservices": [
       {
           "category": {
               "id": 1,
               "name": "laptop"
           }
       },
       {
           "category": {
               "id": 2,
               "name": "software"
           }
       }
   ]
}

我想要这样的输出:

{
   "id": 2,
   "service": "mobile",
   "min": "20",
   "per": "10",
   "tax": "1",
   "cats": [1,2] // this 1 and 2 is coming from categoriesservices array inside the category object i have id
}

如何使用地图功能执行此操作?我是javascript新手，这是一种很好的方法映射或forloop?

How to do this using map function? I am new to javascript, which is good approach map or forloop?

推荐答案

请参见 destructuring assignment ， JSON 了解更多信息.

See destructuring assignment, Array.prototype.map(), and JSON for more info.

// Input.
const input = {
  "id": 2,
  "service": "mobile",
  "min": "20",
  "per": "10",
  "tax": "1",
  "categoryservices": [
    {
      "category": {
        "id": 1,
        "name": "laptop"
      }
    },
    {
      "category": {
         "id": 2,
         "name": "software"
      }
    }
  ]
}

// Categories => Objects to Cats => Ids.
const output = (input) => JSON.parse(JSON.stringify({
  ...input,
  cats: input.categoryservices.map(({category: {id}}) => id),
  categoryservices: undefined
}))

// Log.
console.log(output(input))

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