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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.
Angular is built with TypeScript, and has full support for it, in fact I am yet to see an Angular application this is built using plain JavaScript, this is one of the best things about Angular. Since we are using TypeScript we are sure that most of the nerve racking bugs that we get when using JavaScript, is actually avoided. We get a good IDE support and auto-completion with it, the development experience is nothing short of superb due to TypeScript support. TypeScript is a super set of JavaScript that was built my Microsoft, it extends JavaScript by adding types to it. TypeScript introduces to JavaScript all the capability of a strong Object Oriented Language and static typing. If you already know how to use TypeScript then you'd get a good experience with it, however for beginners, you find out that you have to learn TypeScript in order to fully grasp Angular.
I was learning how to use Angular to build UIs when i had to learn the Rxjs library, it isn't something that I use quite often but I appreciate the library and it's approach to handling asynchronous events that happens in our application. By allowing us to treat our data as a stream, Observables allows us to keep emitting values and any subscription to that Observable will be notified of new data, allowing our application to reactive. A single Observable can be shared across different components in our application, thus sharing a single source of data, almost eliminating the need for introducing custom state management solution.