javascript - 如何从对象数组中获取键和子键？

Question

我有以下对象数组。

const array = [{
  field1: "val1",
  field2: "val2",
  field3: {
    field1: "val1",
    field2: "val2"
  }
},
{
  field1: "val1",
  field2: "val2",
  field3: {
    field1: "val1"
  }
}]

我需要低于输出

const output = [{
  key: "field1",
  subkeys: []
},
{
  key: "field2",
  subkeys: []
},
{
  key: "field3",
  subkeys: ["field1", "field2"]
}]

我可以使用这个获得顶级字段

const keys = array.map(x => Object.keys(x)[0]);

但无法访问内部的。

请帮助...谢谢!

Answer 1

您可以在顶层减少对象键数组，然后检查此键的值是否为对象 - 检索其嵌套键，否则只需保留空的子键数组

const array = [{
  field1: "val1",
  field2: "val2",
  field3: {
    field1: "val1",
    field2: "val2"
  }
},
{
  field1: "val1",
  field2: "val2",
  field3: {
    field1: "val1"
  }
}]

const result = array.map(item => {
  return Object.keys(item).reduce((acc, rec) => {
    if(typeof item[rec] === 'object') {
      return [...acc, {key: rec, subkeys: Object.keys(item[rec])}] 
    }
    return [...acc, {key: rec, subkeys: []}]
  }, [])
})

console.log(result)