Найдите элементы из объекта
// We've created an object, users, with some users in it and a function
// isEveryoneHere, which we pass the users object to as an argument.
// Finish writing this function so that it returns true only if the
// users object contains all four names, Alan, Jeff, Sarah, and Ryan, as keys, and false otherwise.
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) {
return ['Alan', 'Jeff', 'Sarah', 'Ryan'].every((name) =>
obj.hasOwnProperty(name)
);
}
console.log(isEveryoneHere(users));
YosKa
