Objective-C playground?

Question

Is there any sort of Mac app, Web app, or others like JSFiddle for Objective-C/Cocoa purposes?

Answer 1

It's not entirely the same, but look into F-Script: http://www.fscript.org/

It lets you rapid-prototype and experiment. You can also hook it into existing apps very easily. It has been invaluable for me for certain types of UI debugging.

Answer 2

I've also found CodeRunner to be quite handy for boilerplate app generation and one-click console running to try language snippets out. Available on the AppStore at a price.