Cocoa (OS X) vs Yesod: What are the differences?
Cocoa (OS X): The Cocoa frameworks consist of libraries, APIs, and runtimes that form the development layer for all of OS X. Much of Cocoa is implemented in Objective-C, an object-oriented language that is compiled to run at incredible speed, yet employs a truly dynamic runtime making it uniquely flexible. Because Objective-C is a superset of C, it is easy to mix C and even C++ into your Cocoa applications; Yesod: A RESTful Haskell web framework built on WAI. Yesod believes in the philosophy of making the compiler your ally, not your enemy. We use the type system to enforce as much as possible, from generating proper links, to avoiding XSS attacks, to dealing with character encoding issues. In general, if your code compiles, it works. And instead of declaring types everywhere you let the compiler figure them out for you with type inference.
Cocoa (OS X) and Yesod belong to "Frameworks (Full Stack)" category of the tech stack.
"Great community " is the primary reason why developers consider Cocoa (OS X) over the competitors, whereas "Haskell" was stated as the key factor in picking Yesod.
Yesod is an open source tool with 2.11K GitHub stars and 329 GitHub forks. Here's a link to Yesod's open source repository on GitHub.