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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.
Submit your code snippets as a pull request to the official book source code Github repository, under the challenges folder. In case you disagree with DOP, please add a few words as comments in your code that explain why you think that your solution is simpler than the ones that I wrote.
In this article, I am using Lodash FP configured so that it never mutates data in place. Instead of mutating data in place, functions like _.set() create a new version.