# iOS Interview Questions ### What are the major differences between Swift and Objective-C? It's different with these two laguanges besides they're both references counted, but I think the major differents is message dispatch, Objective-C use SEL name to calling objc_msgSend in object's method list, Swift lookup function pointer in vtable with index. [Reference](https://blog.untitledkingdom.com/objective-c-vs-swift-messages-dispatch-9d5b7fd58327) ### What differences between http and https htt