I will tell you which version of Angular to choose. Since the release of Angular 2, the Angular framework has been completely rewritten, so there will be a syntax change when moving from Angular 1 to 2. So, unfortunately, if you know anything about AngularJS, you have to forget everything and move on. You might be wondering what is Angular 4 or Angular 5 or even the future versions 6, 7, or 8. Don’t worry about these upcoming versions. Yes, they are just improvements to existing Angular 2. So moving from Angular 2 to 4 or even 5 is not a syntax change. Just improvements or bug fixes for existing Angular 2 and technically we shouldn’t be referring to Angular 2 or Angular 5. We just call it Angular. With the release of Angular 5, Angular is much faster, smaller, and has a better compiler. And more importantly, they target Progressive Web Apps that try to make it easier to build Progressive Web Apps. So, if I have to say what is the most significant difference between AngularJS and Angular 2, it has to be speed and web components. Even Google has mentioned that the future of the web is in web components. And in Angular 2, data flows in one direction only. Yes, there are ways to return a child data to the parents, but Angular 2 is way better than Angular JS.
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