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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.
Loops are great if your programming languages supports iterables/iterators/generators (also async generators) like in js/ts for example.
Especially generator-to-generator combinators ie. [0] give you terse, transducer expressiveness over computation on finite/infinite streams, arrays, etc. (all iterables). It's easy to compose them, jump into for loops if needed for arbitrary yielding (ie. yielding multiple items sometimes, skipping some, halting etc). `continue`, `break`, nesting, yield, yield from, normal code in for loops is very intuitive and terse creating pleasant, understandable code.
[0] https://github.com/preludejs/generator