如何根據 javascript 中的類型將嵌套數組 object 更改為 object

Question

我想知道如何根據 javascript 中的鍵將嵌套數組 object 更改為 object

我有對象obj1和obj2 ，根據關鍵item類型更改 object。

function changeObj(obj){
  let result =  obj.reduce(function (acc, item) {
      if(item.items.trim() !== "" && item.key.trim() !== ""){
        acc[item.key] = item.items
        return acc
      }
        return acc
    }, {});
  return result;
}
let result = this.changeObj(obj2)
var obj1 = [
 { id:0, items:["SG","AU"], count: 2, key:"countries"},
 { id:1, items:["finance"], count: 3 key:"info"} 
]

var obj2 = [
  { id:0, items: "SG", key: "country"},
  { id:1, items: "details", key: "info"}
]

Expected Output:

// if items key is array
{
  fields: {
    countries: ["SG","AU",2],
    info: ["finance",3]
  }
}

//if items key is string

{
  fields: {
    country: "SG",
    info: "details"
  }
}

Answer 1

我認為您的代碼未運行的原因是您的對象（1 和 2）格式錯誤。 除了條件之外，您的代碼還可以，因為trim()僅適用於字符串類型，因此它在數組上出錯。 試試這個代碼片段

 function changeObj(obj){ let result = obj.reduce(function (acc, item) { acc[item.key] = item.items; return acc; }, {}); return result; } var obj1 = [ { id:0, items:["SG","AU"], count: 2, key:"countries"}, { id:1, items:["finance"], count: 3, key:"info"} ] var obj2 = [ { id:0, items: "SG", key: "country"}, { id:1, items: "details", key: "info"} ] console.log(changeObj(obj1));

Answer 2

 const changeObj = obj => obj.reduce((acc, item) => { if (Array.isArray(item.items)) { acc[item.key] = [...item.items, item.count]; } else { acc[item.key] = item.items; } return acc; }, {}); var obj1 = [ { id: 0, items: ['SG', 'AU'], count: 2, key: 'countries' }, { id: 1, items: ['finance'], count: 3, key: 'info' } ]; var obj2 = [ { id: 0, items: 'SG', key: 'country' }, { id: 1, items: 'details', key: 'info' } ]; console.log(changeObj(obj1)); console.log(changeObj(obj2));

或者清理得更多

 const changeObj = obj => obj.reduce((acc, { items, key, count }) => { Array.isArray(items)? (acc[key] = [...items, count]): (acc[key] = items); return acc; }, {}); var obj1 = [ { id: 0, items: ['SG', 'AU'], count: 2, key: 'countries' }, { id: 1, items: ['finance'], count: 3, key: 'info' } ]; var obj2 = [ { id: 0, items: 'SG', key: 'country' }, { id: 1, items: 'details', key: 'info' } ]; console.log(changeObj(obj1)); console.log(changeObj(obj2));