I'm developing a WebApp with `Socket IO` and I ha...

# javascript

[frank]

I'm developing a WebApp with Socket IO and I had a question how to return a callback with Kotlin in dynamic function.

Intellij suggest: return@on and Works. But I am not sure that is correct

Server

socket.on("join") { nickName,callback ->
    val succes = users.addUser(socket.id,nickName)
    if (succes.equals(USER_FOUND)) return@on callback(USER_FOUND)
    numOfUsers = users.size
    console.log(numOfUsers)
}

Client:

socket.emit("join", nickName ) { error  ->
    val msg = error as String
    if(msg.isNotBlank()) {
        window.alert(error)
    }
}