What are the main differences between Objective-C and Swift?

Question

There doesn’t seem to be that much comparison between Objective-C and Swift on the Internet. Apart from some grammatical differences, what is the difference between OC and Swift?

Answer 1

1. Safe

2. Modern

3. Power

Answer 2

Swift’s syntax is obviously closer to most current mainstream programming languages. Objective-C’s unique [] scares away many C/C++/Java programmers.
And Swift does not support older OSX/iOS, but Objective-C does, as long as the API used is not too new.

Answer 3

Swift is more secure, the code is more elegant, concise, highly readable, and runs faster.

Answer 4

Obviously, the spelling is different