Individual keys in objects check not working

JavaScript
1

With my current code, I only get the first two tests to pass. The other four are failing. They are:

The function isEveryoneHere should return false if Alan is not a property on the users object
The function isEveryoneHere should return false if Jeff is not a property on the users object
The function isEveryoneHere should return false if Sarah is not a property on the users object
The function isEveryoneHere should return false if Ryan is not a property on the users object

So doesn’t my current code check for those and how do I make it so that it does? Thanks.

Your code so far


let users = {
Alan: {
  age: 27,
  online: true
},
Jeff: {
  age: 32,
  online: true
},
Sarah: {
  age: 48,
  online: true
},
Ryan: {
  age: 19,
  online: true
}
};

function isEveryoneHere(obj) {
// Only change code below this line
if (!("Sarah" in obj) && !("Jeff" in obj) && !("Ryan" in obj) && !("Alan" in obj)) {
  return false;
}
return true;
// Only change code above this line
}

console.log(isEveryoneHere(users));

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36 Edg/83.0.478.56.

Challenge: Check if an Object has a Property

Link to the challenge:

2

This condition is only true (meaning the function will return false) if none of those names are properties in obj. If any of those are present, you are returning true.

3

Yeah, that helped. Thanks.

if (!("Sarah" in obj && "Jeff" in obj && "Ryan" in obj && "Alan" in obj)) {
  return false;
}
return true;
4

FYI - because ("Sarah" in obj && "Jeff" in obj && "Ryan" in obj && "Alan" in obj) is a boolean, and you want to return a boolean, you don’t need an if/else.

You can just do this, if you want to.

return "Sarah" in obj && "Jeff" in obj && "Ryan" in obj && "Alan" in obj;