javascript - 在函数中传递对象

Question

我正在做一个 freecodecamp 挑战，我被要求完成一个函数，如果传递的对象包含所有四个名称，则返回 true:'Alan' 'Jeff' 'Ryan' 'Sarah'。
之前定义了一个对象，其中包含数据:

let users = {
    Alan: {
      age: 27,
      online: true
    },
    Jeff: {
      age: 32,
      online: true
    },

等等。
函数是这样开始的

function isEveryoneHere(userObj) {}

我把这个写成我完成的函数，我可以在其中返回所有 4 个名字:

for (const property in userObj) {
  if (userObj) {
    return userObj.hasOwnProperty(property)
  }

但我仍然被告知我没有达到挑战的标准。任何指示或建议提示？

edit: Error Message The users object should not be accessed directly

Passed The users object should only contain the keys Alan, Jeff,Sarah, and Ryan

Passed The function isEveryoneHere should return true if Alan, Jeff,Sarah, and Ryan are properties on the object passed to it.

The function isEveryoneHere should return false if Alan is not aproperty on the object passed to it.

The function isEveryoneHere should return false if Jeff is not aproperty on the object passed to it.

The function isEveryoneHere should return false if Sarah is not aproperty on the object passed to it.

The function isEveryoneHere should return false if Ryan is not aproperty on the object passed to it

Answer 1

我可能会做类似的事情

let users = {
    Alan: {
      age: 27,
      online: true
    },
    Jeff: {
      age: 32,
      online: true
    },
}

function check(userObj) {
  return ['Alan', 'Jeff', 'Ryan', 'Sarah'].every(user => userObj.hasOwnProperty(user));
}

function check2(userObj) {
  return ['Alan', 'Jeff', 'Ryan', 'Sarah'].every(user => Object.keys(userObj).includes(user));
}

console.log('check: ' + check({ Jeff: 1, Alan: 2, Ryan: 3, Sarah: 4 }));
console.log('check2: ' + check2({ Jeff: 1, Alan: 2, Ryan: 3, Sarah: 4 }));
console.log('Should fail (check): ' + check(users));
console.log('Should fail (check2): ' + check2(users));

两种变体都应满足所有标准——除了不应该直接访问对象的标准。我不确定他们的意思，但第二个将键转换为数组，所以也许这就是他们正在寻找的，即使它效率低下。