Inbox Manager

function solve(input){
    let inbox = {};
    for(let i = 0; i < input.length; i++){
        let [command, username, email] = input[i].split('->');
    // console.log(input);
        switch(command){
            case "Add":
                if(!inbox.hasOwnProperty(username)){
                    inbox[username] = [];
                    // console.log(inbox);
            } else {
                console.log(`${username} is already registered`);
            }
            break;
            case "Send":
                if(inbox.hasOwnProperty(username)){
                    inbox[username].push(email);
                }
                // console.log(inbox);
                break;
            case "Delete":
                if(inbox.hasOwnProperty(username)){
                delete inbox[username];
                } else {
                    console.log(`${username} not found!`);
                }
                break;
            case "Statistics":
                break;
        }
    }
    let sortedByEmail = Object.entries(inbox).sort((a, b) => b[1] - a[1]);
    // console.log(sortedByEmail);
    let sortedByUsername = sortedByEmail.sort((a, b) => a[0].localeCompare(b[0]));
    // console.log(sortedByUsername);
    console.log(`Users count: ${sortedByUsername.length}`);
    for(let kvp of sortedByUsername){
        console.log(`${kvp[0]}`);
            for(let kkk of kvp[1]){
                console.log(` - ${kkk}`);
            }
    }
}