I tried to keep Jerry API identical to the jQuery as much as possible. In some cases, you can simply copy some jQuery code and paste it in Java - and it will work! Of course, there are some differences due to the different nature of the platforms.
The well-known jQuery method $() is renamed tos() in Jerry. The reason is compatibility with different JVMs: GraalVM, for example, does not allow usage of $ in method names.
If you don't like the s() method, use the find() alternative.