3 - message - final exam - fundamentals

function messages(input) {
    let listOfUsers = {};
    let totalMessagesCount = Number(input.shift());

    let line = input.shift();
    while (line != "Statistics") {
        let tokens = line.split('=');
        let command = tokens[0];
        if (command === 'Add') {
            let userName = tokens[1];
            let sent = Number(tokens[2]);
            let received = Number(tokens[3]);
            let total = sent + received;
            if (listOfUsers[userName] == undefined) {
                listOfUsers[userName] = {
                    sent: sent,
                    received: received,
                    total: total
                }
            }
        } else if (command === 'Message') {
                let sender = tokens[1];
                let receiver = tokens[2];
                if (listOfUsers[sender] != undefined && listOfUsers[receiver] != undefined) {
                    listOfUsers[sender].sent += 1;
                    listOfUsers[sender].total += 1;
                    listOfUsers[receiver].received += 1;
                    listOfUsers[receiver].total += 1;
                    if (listOfUsers[sender].total >= totalMessagesCount) {
                        console.log(`${sender} reached the capacity!`);
                        delete listOfUsers[sender];
                    }
                    if (listOfUsers[receiver].total >= totalMessagesCount) {
                        console.log(`${receiver} reached the capacity!`);
                        delete listOfUsers[receiver];
                    }
                }

        } else if (command === 'Empty') {
                let user = tokens[1];
                if (user != 'All') {
                    delete listOfUsers[user];
                } else {
                    for(let el in listOfUsers){
                        delete listOfUsers[el];
                    }

                }
            }
            line = input.shift();
    }


    let objAsArr = Object.entries(listOfUsers);
    console.log(`Users count: ${objAsArr.length}`);
    objAsArr.sort((a, b) => a[0].localeCompare(b[0]))
    .sort((a, b) => b[1].received - a[1].received);


    for (let el of objAsArr) {
        console.log(`${el[0]} - ${el[1].total}`);
    }
}