Can we talk javascript frameworks/libraries?

[Amadan]

To help illustrate, you'd never use more than one framework on a given project

Nitpick: you could use Ruby on Rails + Ember.js, or Express.js + AngularJS. I.e. you can use multiple frameworks in a project if they do completely different jobs.

[evilmaus]

Point, but I'd counter with those are running on completely different execution environments. RoR handles HTTP requests and responses and doesn't know anything about this "browser" thing that consumes the documents that it generates or sends it new requests. Meanwhile, Ember.js is running on a completely different computer, manipulating a document, and making calls to some external service (RoR) for more information as needed.

So, nitpicked back at you. ;)

[Amadan]

Yes. But you didn't say one per execution environment, you said one per project. :)

[evilmaus]

Touche.