javascript - 递归调用多个嵌套对象给出未定义

Question

我写了一个简单的算法，它的工作是找到职业是教师的对应名称。

给定的代码递归调用函数，直到获得给定的结果。

在执行代码时，我得到的最终输出是 undefined。正如我所期望的那样，这个名字是 ishan。

有人可以帮我诊断算法中的问题吗？

   
    //Accessing infitely nested Array
    // Infinitely nested Array

    const infiniteArray = [
      {
        name: "Jack",
        age: "98",
        profession: "doctor",
        children: [
          {
            name: "Varun",
            age: "80",
            profession: "scientist",
            children: [
              {
                name: "Ishan",
                age: "62",
                profession: "teacher"
              }
            ]
          }
        ]
      }
    ];
    
    
    
    const accessNestedObject = (infiniteArray) => {
      return infiniteArray.forEach(element => {
        if (element['profession'] === 'teacher') {
          console.log(element.name)
          return element.name
        } else {
          console.log(element["children"])
          return accessNestedObject(element["children"])
        }
      });
    }
    
    const result = accessNestedObject(infiniteArray)
    console.log(result)

Answer 1

您将得到 undefined 因为那是 Array#forEach 的预期返回值.

您必须声明一个变量来存储循环的最终结果。

//Accessing infitely nested Array
// Infinitely nested Array

const infiniteArray = [
  {
    name: "Jack",
    age: "98",
    profession: "doctor",
    children: [
      {
        name: "Varun",
        age: "80",
        profession: "scientist",
        children: [
          {
            name: "Ishan",
            age: "62",
            profession: "teacher"
          }
        ]
      }
    ]
  }
];



const accessNestedObject = (infiniteArray) => {
  let result = null;

  infiniteArray.forEach(element => {
    if (element.profession === 'teacher') {
      result = element.name;
    } else {
      result = accessNestedObject(element.children);
    }
  });
  
  return result;
}

const result = accessNestedObject(infiniteArray);
console.log(result);