for (let user in users) {
console.log(user);
};
// logs:
Alan
Jeff
Sarah
Ryan
let users = {
Alan: {
age: 27,
online: false
},
Jeff: {
age: 32,
online: true
},
Sarah: {
age: 48,
online: false
},
Ryan: {
age: 19,
online: true
}
};
function countOnline(obj) {
let count = 0;
for (let user in obj) {
if(obj[user]['online'] === true) {
count++;
}
}
return count;
}
console.log(countOnline(users));