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In this part, we are going to a prayer, the service, I quote, such that you said, go to this page,

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enjoy the chat room inside the service side.

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So first we are going to create a helper functions in the server.

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So we go back to the surface side and under the server folder, we create a helper.

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Yes.

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And inside the server.

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Inside these Ultragaz we are going to create that uses a raid, and initially this is empty.

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And then we are going to create a at USA functions, which is equal to.

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Socket IP, because we are going to pass the socket IP, the user name, the user IP and also the IP.

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So for us, we are going to check whether the user already exists in this room.

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So we create a constant and then we are going to use the user to find and then to use it and then to

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find out the user thought, well, ID is equal, equal to the ID that we passed to these functions.

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And the user thought user ID use ICO to do with the idea that we pass to these functions.

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So the first thing is if we are going to return to error and the error is the user already sees in this

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role, if not exist, we are going to create the user of the topic that we passed in, including the

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socket ID and name the user ID and also the room ID.

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Not we create the user are going to push the user user list and then we are going to we turned to use

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the user object, but since they are the same name, they're going to just simply use we turn user and

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at last we are going to exploit this by using more exports is equal to act it, and now we just create

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one helper functions.

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So actually what we do here is there is a user list here.

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If there is a new user like this name is drawn and the user is one to fee and the rheumatiz one to a

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fee, and if the function see that is already exists, then it will return to Earth.

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Otherwise it will happen to this array.

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So we delete this and we back to the index.

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And first we are going to import these helper functions and then we create content that user is equal

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to require helper.

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And then here we are going to descend the joint U.

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N When the user joins these chat room, we are going to post name and the room ID and also the user

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ID and then it will be turned to Iraq and or the user if we are going to add user.

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So we have the property of socket IP, which is equal to the socket ID and the name.

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And since the name property and the where they are using the same path or the same string.

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So we just use one word, only part of the named name.

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And then also this is the same, we just use my ID and also they do the IP.

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So we are going to check if there's no error, if there's error and we are going to load the joint or

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else load the joint user and then display the user.

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So now we are going to add a kind of side to impeach the joint event.

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So we back to the chat and first, like home, we are going to import the eye of the socket.

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I'll change and also add that to the socket.

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And also we have to import the endpoint.

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And also, we have to use that, in fact.

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So now here we use to use effort and we are going to image first we are going to create a socket and

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then we use to emit and then we pass the name, which is the user name here and the room ID maybe we

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have to delete it and put it under the ID so it will have the bomb ID first and also the user I.D. equal

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to a user I.D..

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So I think we already said all the things and we can tried to enter the chat room.

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I think to make it more clear we should go to the help function and then we can also download the user

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these and then we display the users here and then we stop the server and then we.

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We stopped the surfer because we just want to clear the U.S. at least so now we sent Astron and then

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we go to Rome one and then we go to another Browsr and ask Tom and also go to Rome one.

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Now you can see the user list has gone and also, Tom.

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Now, if we open one more user and then we ask John again and go to one one now you can see there is

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an error.

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The user already exists in this room.

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So this already works.