Frenchiie

I dont want to be an ass but how do you not know how to invert a tree? Anyone who knows how to write a tree and traverse it should be able to do this. If you ran out of time coding it then that's different.

Not really.

are you trying to compare JS using Node.js with Swift?

Well Node.js(+Framework) is an entirely different beast from Swift(+Framework), RoR, Python+Django, etc. As for Swift(+Framework) vs Python+Django, RoR, etc, Swift would have to be faster and introduce some amazing new feature for it to replace anything. I dont personally like how Swift is statically typed but does type inference. If i dont specify a type for my variable i should be able to change my variable's value to whatever type i want.

Unless it's faster than Java or offers an amazing feature i doubt it.