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I agree that knowing when it's not worth it to add a dependency for something simple is valuable. I think that jQuery's usefulness is more than just compatibility though.
jQuery is really good at DOM manipulation and has an easy-to-learn API. It's possible to write a site's back-end code in C, but most developers prefer to use something a little easier to learn and less verbose like PHP, Python or JS.
jQuery can make development a lot faster on some projects. It's not the right tool for every project, but it is for some.
jQuery definitely has a very neat API, but a lot of that API has been ported into the standard runtime (think sizzle etc), I haven't really found myself reaching back for jQuery when dealing with DOM modifications rather than the standard API (though I have to admit that adding a bunch of DOM elements can be cumbersome, that's usually the sign you're in need of something more template-like like Vue, Svelte etc when you don't need a full SPA)
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I agree that knowing when it's not worth it to add a dependency for something simple is valuable. I think that jQuery's usefulness is more than just compatibility though.
jQuery is really good at DOM manipulation and has an easy-to-learn API. It's possible to write a site's back-end code in C, but most developers prefer to use something a little easier to learn and less verbose like PHP, Python or JS.
jQuery can make development a lot faster on some projects. It's not the right tool for every project, but it is for some.
jQuery definitely has a very neat API, but a lot of that API has been ported into the standard runtime (think sizzle etc), I haven't really found myself reaching back for jQuery when dealing with DOM modifications rather than the standard API (though I have to admit that adding a bunch of DOM elements can be cumbersome, that's usually the sign you're in need of something more template-like like Vue, Svelte etc when you don't need a full SPA)