See my edit. It is possible, but the client needs to implement it.
If you think it would be useful, open a feature request in your client’s repository. It can be done by getting the list of all the communities in your instance and searching by instance domain.
Are you trying to filter known communities by their instance? That is not supported by the Lemmy API, so a client can’t do that without depending on some other third party API.
~~https://join-lemmy.org/api/main#tag/Miscellaneous/operation/Search~~
edit: A client can do it, but I don’t think any client has that feature.
Well then, as others have suggested, you should check out https://lemmyverse.net/
Though you will only be able to search Lemmy communities. Community search for Piefed and Mbin/Kbin is not implemented yet.
Depends on what client you use. Showing all communities (which is what I assume you meant by “channels”) of an instance does not require authentication, at least for Lemmy. Which means it is totally possible to implement this feature into the clients.
Communities will not show up in someone’s instance if nobody has made the community known to your instance. Someone from your instance DOES NOT need to be subscribed to a community from a remote instance to make it visible for users on your instance. Subscribing only lets your instance receive updates for that community.
These previous ways will only show communities that are already known to the instance. Especially if you joined a small or inactive Lemmy instance, there will be few communities to discover. You can find more communities by browsing different Lemmy instances, or using the Lemmy Explorer. When you found a community that you want to follow, enter its URL (e.g. https://feddit.org/c/main) or the identifier (e.g. !main@feddit.org) into the search field of your own Lemmy instance. Lemmy will then fetch the community from its original instance, and allow you to interact with it. The same method also works to fetch users, posts or comments from other instances.
https://join-lemmy.org/docs/users/01-getting-started.html#following-communities
One other way that is not mentioned here is by putting the community tag without the ! into your instance’s URL after c/. This too will initiate a webfinger request and make the community known. E.g.: https://your-instance.com/c/cats@other-instance.org
Related helpful documentation: https://join-lemmy.org/docs/administration/federation_getting_started.html
Woaw. Es überrascht mich, wie lesbar die Programme sind, die mit ddp geschrieben wurden.
Ich finde das echt toll. Vielleicht kann man es im Software Unterricht einsetzen, damit Schüler C/C++ schneller verstehen.
Das glaube ich.