在 javascript 中转换数组的最佳方法

Question

我正在开发一个反应应用程序，我从 api 调用中获取以下数组。

var arrayLike ={ 
         "2020-W1": [
         { 
            "type": "TAX_REFUND_IN_INT", 
            "net_amount_base": "500001"
         },
         { 
            "type": "TAX_REFUNDIN_IN_EXT", 
            "net_amount_base": "500002"
         }
      ],
      "2020-W2": [
         { 
            "type": "RENTAL_LEASING_INCOME_IN_INT", 
            "net_amount_base": "5000"
         },
         { 
            "type": "DIVIDENTS_INCOME_IN_INT", 
            "net_amount_base": "15000"
         },
         { 
            "type": "LICENCE_INCOME_IN_EXT", 
            "net_amount_base": "10000"
         },
         { 
            "type": "OTHER_INCOME_IN_EXT", 
            "net_amount_base": "1000"
         } 
      ] 
   } 

我想像下面这样转换这个数组：

var new_arr =  var new_arr =  [{
            year_week: '2020-W1',
            TAX_REFUND_IN_INT: '1000',
            TAX_REFUNDIN_IN_EXT: '300' 
          },
          {
            year_week: '2020-W2',
            RENTAL_LEASING_INCOME_IN_INT: '2000',
            DIVIDENTS_INCOME_IN_INT: '15000',
            LICENCE_INCOME_IN_EXT: '10000',
            OTHER_INCOME_IN_EXT: '1000' 
          } ]

有人可以帮我怎么做吗？ 如果需要，我也可以更改源数组，因为我可以控制 API。如果需要更多信息，请告诉我。

Answer 1

您可以只遍历数组，然后取出您想要的部分。 如果您的传入数据在actual_arr

var actual_arr = {
  "2020-W1" :{
  0: {site_id: "004", year_week: "2020-W1", type: "RENTAL_LEASING_INCOME", in_out: "IN", int_ext: "INT","amount" :1000},
  1: {site_id: "004", year_week: "2020-W1", type: "DIVIDENTS_INCOME", in_out: "IN", int_ext: "INT","amount" :300},
  2: {site_id: "004", year_week: "2020-W1", type: "LICENCE_INCOME", in_out: "IN", int_ext: "INT","amount" :20},
  3: {site_id: "004", year_week: "2020-W1", type: "OTHER_INCOME", in_out: "IN", int_ext: "INT","amount" :100 },
  },
 }



const new_arr = Object.keys(actual_arr).map(key=> {
  // Build an object to receive the values
  const object = {year_week: key}
   Object.keys(actual_arr[key]).forEach(ix => {
     const income_name = actual_arr[key][ix].type
     const income_amount = actual_arr[key][ix].amount
      object[income_name] = income_amount
  })
  return object
})

Answer 2

 var arrayLike = { "2020-W1": [{ "type": "TAX_REFUND_IN_INT", "net_amount_base": "500001" }, { "type": "TAX_REFUNDIN_IN_EXT", "net_amount_base": "500002" } ], "2020-W2": [{ "type": "RENTAL_LEASING_INCOME_IN_INT", "net_amount_base": "5000" }, { "type": "DIVIDENTS_INCOME_IN_INT", "net_amount_base": "15000" }, { "type": "LICENCE_INCOME_IN_EXT", "net_amount_base": "10000" }, { "type": "OTHER_INCOME_IN_EXT", "net_amount_base": "1000" } ] } let newArray = [] Object.values(arrayLike).forEach((arr, index) => { let newObj = {} newObj['yearWeek'] = Object.keys(arrayLike)[index] arr.forEach((item) => { newObj[`${item.type}`] = item.net_amount_base }) newArray.push(newObj) }) console.log(newArray)

编辑：更新了一个片段！

Answer 3

您可以尝试使用map进行一些数组操作， reduce 。

下面的片段可能会有所帮助

 const arr = { "2020-W1": { 0: { site_id: "004", year_week: "2020-W1", type: "RENTAL_LEASING_INCOME", in_out: "IN", int_ext: "INT", amount: 1000 }, 1: { site_id: "004", year_week: "2020-W1", type: "DIVIDENTS_INCOME", in_out: "IN", int_ext: "INT", amount: 300 }, 2: { site_id: "004", year_week: "2020-W1", type: "LICENCE_INCOME", in_out: "IN", int_ext: "INT", amount: 20 }, 3: { site_id: "004", year_week: "2020-W1", type: "OTHER_INCOME", in_out: "IN", int_ext: "INT", amount: 100 }, }, "2020-W2": { 0: { site_id: "004", year_week: "2020-W2", type: "RENTAL_LEASING_INCOME", in_out: "IN", int_ext: "INT", amount: 2000 }, 1: { site_id: "004", year_week: "2020-W2", type: "DIVIDENTS_INCOME", in_out: "IN", int_ext: "INT", amount: 400 }, 2: { site_id: "004", year_week: "2020-W2", type: "LICENCE_INCOME", in_out: "IN", int_ext: "INT", amount: 2000 }, 3: { site_id: "004", year_week: "2020-W2", type: "OTHER_INCOME", in_out: "IN", int_ext: "INT", amount: 5000 }, }, "2020-W3": { 0: { site_id: "004", year_week: "2020-W3", type: "RENTAL_LEASING_INCOME", in_out: "IN", int_ext: "INT", amount: 1000 }, 1: { site_id: "004", year_week: "2020-W3", type: "DIVIDENTS_INCOME", in_out: "IN", int_ext: "INT", amount: 2000 }, 2: { site_id: "004", year_week: "2020-W3", type: "LICENCE_INCOME", in_out: "IN", int_ext: "INT", amount: 3000 }, 3: { site_id: "004", year_week: "2020-W3", type: "OTHER_INCOME", in_out: "IN", int_ext: "INT", amount: 4000 }, }, } const res = Object.keys(arr).map((year_week) => { const typeAmounts = Object.keys(arr[year_week]).reduce( (acc, index) => ({...acc, [arr[year_week][index].type]: arr[year_week][index].amount, }), {} ) return { year_week, ...typeAmounts, } }) console.log(res)

Answer 4

试试这个，这给出了您正在寻找的确切格式（对象数组）。

在这种情况下，我使用 Set() 删除重复项，然后使用扩展运算符 (...) 将其转换回包含所有唯一对象的数组。 也有一些方法可以用 .reduce() 和 .filter() 做同样的事情。 以下是一些可能有用的资源。

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set/Set

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax

https://www.w3schools.com/jsref/jsref_reduce.asp

https://www.w3schools.com/jsref/jsref_filter.asp

 let arrayLike = { "2020-W1": [{ "type": "TAX_REFUND_IN_INT", "net_amount_base": "500001" }, { "type": "TAX_REFUNDIN_IN_EXT", "net_amount_base": "500002" } ], "2020-W2": [{ "type": "RENTAL_LEASING_INCOME_IN_INT", "net_amount_base": "5000" }, { "type": "DIVIDENTS_INCOME_IN_INT", "net_amount_base": "15000" }, { "type": "LICENCE_INCOME_IN_EXT", "net_amount_base": "10000" }, { "type": "OTHER_INCOME_IN_EXT", "net_amount_base": "1000" } ] } function solveProblem(arrayLike) { let final_array = [] let newObjectOne = {} let newObjectTwo = {} for (i in arrayLike) { for (z in i) { if (i === "2020-W1") { if (arrayLike[i][z],== undefined) { newObjectOne["year_week"] = "2020-W1". newObjectOne[arrayLike[i][z].type] = arrayLike[i][z].net_amount_base final_array,push(newObjectOne) } } if (i === "2020-W2") { if (arrayLike[i][z].== undefined) { newObjectTwo["year_week"] = "2020-W2". newObjectTwo[arrayLike[i][z].type] = arrayLike[i][z].net_amount_base final_array.push(newObjectTwo) } } } } let unqiueItemsArr = new Set(final_array) return [...unqiueItemsArr] } //console.log(solveProblem(arrayLike)) to see new array of objects console.log(solveProblem(arrayLike))

Answer 5

使用Object.entreis ， map ， Object.fromEntries进行转换。

 const convert = data => Object.entries(data).map(([year_week, arr]) => ({ year_week, ...Object.fromEntries(arr.map(Object.values)), })); var arrayLike = { "2020-W1": [ { type: "TAX_REFUND_IN_INT", net_amount_base: "500001", }, { type: "TAX_REFUNDIN_IN_EXT", net_amount_base: "500002", }, ], "2020-W2": [ { type: "RENTAL_LEASING_INCOME_IN_INT", net_amount_base: "5000", }, { type: "DIVIDENTS_INCOME_IN_INT", net_amount_base: "15000", }, { type: "LICENCE_INCOME_IN_EXT", net_amount_base: "10000", }, { type: "OTHER_INCOME_IN_EXT", net_amount_base: "1000", }, ], }; console.log(convert(arrayLike));