Basic Data Structures - Check if an Object has a Property

Please tell me why. I am trying to complete this challenge in Javascript. My codes and the solution are the same except I keep getting the type error.

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

function isEveryoneHere(userObj) {
  // Only change code below this line
    if (userObj.hasOwnPropery("Alan") && userObj.hasOwnProperty('Jeff') && userObj.hasOwnProperty('Sarah') && userObj.hasOwnProperty('Ryan')) {
      return true;
    } else {
      return false;
    }
  // Only change code above this line
}

console.log(isEveryoneHere(users));

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Challenge: Basic Data Structures - Check if an Object has a Property

Link to the challenge:

The solution has it. I don’t understand.

the solution uses hasOwnProperty (not hasOwnPropery)

Thank you. I was staring at that things for a long time but did not catch the spelling error.

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