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.
I have a couple of big projects that use jQuery. We expect to keep it until the entire sites are rebuilt, because there's no point replacing it really.
When I edit javascript files that're already using jQuery, sometimes I use it and sometimes I write modern vanilla javascript, but these sites have no build process that would convert modern script into anything suitable for obsolete browsers - and some sites still have to support vintage tech.
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I have a couple of big projects that use jQuery. We expect to keep it until the entire sites are rebuilt, because there's no point replacing it really.
When I edit javascript files that're already using jQuery, sometimes I use it and sometimes I write modern vanilla javascript, but these sites have no build process that would convert modern script into anything suitable for obsolete browsers - and some sites still have to support vintage tech.