I've been a professional C, Perl, PHP and Python developer.
I'm an ex-sysadmin from the late 20th century.
These days I do more Javascript and CSS and whatnot, and promote UX and accessibility.
Autocompletion of anything in open buffers is available out-the-box. Jumping to files depends on what you mean, but capital-letter marks and things like gd and gf will do that for you. Buffers match by partial and filenames autocomplete when opening them. Unused code is a much more IDE thing though, which requires actual inspection of the code rather than pattern-based syntax highlighting.
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Autocompletion of anything in open buffers is available out-the-box. Jumping to files depends on what you mean, but capital-letter marks and things like
gdandgfwill do that for you. Buffers match by partial and filenames autocomplete when opening them. Unused code is a much more IDE thing though, which requires actual inspection of the code rather than pattern-based syntax highlighting.