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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
The plus side is that you'd be really hard pressed to think of a program you can write that doesn't involve some level of applied logic. Maybe try writing an app which tells you what the current time is in a bunch of different time zones. Write it first using the date-fns or moment libraries, and then try to use less and less of the functions provided by those libraries, replacing it with your own code. You might be surprised how tricky and involved just that can be!
The plus side is that you'd be really hard pressed to think of a program you can write that doesn't involve some level of applied logic. Maybe try writing an app which tells you what the current time is in a bunch of different time zones. Write it first using the date-fns or moment libraries, and then try to use less and less of the functions provided by those libraries, replacing it with your own code. You might be surprised how tricky and involved just that can be!