javascript - 从对象javascript的嵌套数组中查找条目

Question

我需要在使用输入类型 id(which is unique) 时一起返回带有类别和类型的字符串，我已经差不多完成了，但是我无法获取根类别。我的解决方案返回“露台”，但我需要“农村/露台”。

我觉得我把事情搞得太复杂了

let obj =[
  {
    category: 'Residential',
    category_id: 1,
    types: [{name: 'House', id: 1},{name: 'Townhouse / Villa', id: 3},{name: 'House and Land', id: 5},{name: 'Duplex', id: 4},{name: 'Land', id: 6},{name: 'Terrace', id: 16},{name: 'Apartment/Unit', id: 2},{name: 'Relocatable', id: 7}]
  },
  {
    category: 'Commercial',
    category_id: 2,
    types: [{name: 'Office', id: 12},{name: 'House', id: 8},{name: 'Land', id: 9},{name: 'Shop', id: 10},{name: 'Factory', id: 11}]
  },
  {
    category: 'Rural',
    category_id: 3,
    types: [{name: 'House', id: 17},{name: 'House and Land', id: 14},{name: 'Land', id: 13},{name: 'Terrace', id: 15}]
  }
];
console.log(obj.map(o=>o.types).reduce((acc, val) => acc.concat(val), []).find(inner_obj=>inner_obj.id==15).name);

Answer 1

我可能会尝试这样的事情。使用 reduce() 遍历主要项目，然后使用 find() 查看是否有匹配的项目。如果是这样，请将您需要的内容推送到阵列。

let obj =[{category: 'Residential',category_id: 1,types: [{name: 'House', id: 1},{name: 'Townhouse / Villa', id: 3},{name: 'House and Land', id: 5},{name: 'Duplex', id: 4},{name: 'Land', id: 6},{name: 'Terrace', id: 16},{name: 'Apartment/Unit', id: 2},{name: 'Relocatable', id: 7}]},  {category: 'Commercial',category_id: 2,types: [{name: 'Office', id: 12},{name: 'House', id: 8},{name: 'Land', id: 9},{name: 'Shop', id: 10},{name: 'Factory', id: 11}]},{category: 'Rural',category_id: 3,types: [{name: 'House', id: 17},{name: 'House and Land', id: 14},{name: 'Land', id: 13},{name: 'Terrace', id: 15}]}];

let found = obj.reduce((a, c) => {
    let found = c.types.find(t => t.id === 15)
    if (found) a.push({category: c.category, name:found.name})
    return a
}, [])
  
console.log(found)

如果有不止一件带有 id===15 的元素，我可能会返回不止一件元素。在这种情况下，不清楚应该发生什么，但将它们全部归还似乎是合理的。

编辑:如果您知道 id 是唯一的

如果你知道每个 id 只有一个，你可以提前退出，这可能会在大搜索中节省一些时间:

let obj =[{category: 'Residential',category_id: 1,types: [{name: 'House', id: 1},{name: 'Townhouse / Villa', id: 3},{name: 'House and Land', id: 5},{name: 'Duplex', id: 4},{name: 'Land', id: 6},{name: 'Terrace', id: 16},{name: 'Apartment/Unit', id: 2},{name: 'Relocatable', id: 7}]},  {category: 'Commercial',category_id: 2,types: [{name: 'Office', id: 12},{name: 'House', id: 8},{name: 'Land', id: 9},{name: 'Shop', id: 10},{name: 'Factory', id: 11}]},{category: 'Rural',category_id: 3,types: [{name: 'House', id: 17},{name: 'House and Land', id: 14},{name: 'Land', id: 13},{name: 'Terrace', id: 15}]}];

function find(id, obj) {
    for (prop of obj){
        let found = prop.types.find(t => t.id === id)
        if (found) return [prop.category, found.name]
    }
}
console.log(find(15, obj))