There are a lot of things I really love about Swift. But the most awesome feature is safety in my eyes. And this is mostly about the absence of null pointers and the usage of an optional type.
There are so many crashes and other errors that were 'normal' in Objective-C which are just not possible with Swift, this is awesome!
The simplicity of it's syntax but equally the power you can get out of it with features like type safety, generics, extenions etc.
But my favorite part about Swift is the community :)
It's not just Swift, it's iSwift and that's why.
and it's like C which just works.
Lennart Fischer
I really like the simplicity of the Swift syntax. If you write "swifty" code, it almost reads like a poem in comparison to other languages, but is still extremely powerful.
I was able to learn basic iOS Development with Swift in just a few month from no programming experience at all and it also allowed me to learn a lot of other languages based on my experience with Swift.
Moreover I like that it was made open source and everybody can contribute to make Swift a even better language!