Building conditions into the 'Filters' field of a connection

I’m trying to write some conditions into the ‘Filters’ field of a connection, of the sort “The userId isn’t an empty string or null value”.

A wise man called @Thierry told me that you can just write operators like in Excel. It’s true that equals is easy, like “output.UserId = “xyz”” works. But not equals isn’t <> or !=

Could you please write out some common operators for the Filter field? Especially stuff like not equals, and, or. I looked through almost all the examples in the integrations part of the website and I can’t find any with examples of filters.

Hi Richard,
The equality operator in Hackeet is == (not =, which is the assignment operator), while the “Not equal to” operator is “!=”. Here are some examples of how filters are used.