socket.emit vs client.emit

[mfachmirizal]

Hello sir, why we use "client.emit(...)" in line 43 instead of "socket.emit".
I try to change it to "socket.emit", but it not work, and I don't know why.. Can you explain it for me ?.
Thanks and sorry for my bad english

[bouchrabelmehdi]

Please did you succeed in making the app work in the client side? If yes, how did you do so?
Thank you so much in advance for your answer.