Swift is a programming language developed by Apple as a replacement for Objective-C. It is designed specifically for iOS and Mac app development. Swift aims to be more modern, safer, and easier to use than Objective-C. Key features include not needing semicolons, optionals for null checking, tuples, and strong typing. Swift also focuses on optimizations to be faster than C and provides memory management without needing to use retain/release like in Objective-C.

1. Swift

2. wift

3. They claim they focused on developers
this time..

4. They claim they focused on developers
this time..
• Built specifically for iOS and MAC app development
• You can do the same things as with Objective-C
• Add great features from the other languages such
as tuples and optionals
• Less brackets and semicolons!!!
• Looks and feels like scripting language ( Javascript )
…so, we got LESS code to write and FAST
development times

5. Memory management? – what
memory management!?

6. Faster than C

7. Faster than C
• Because of optimizations you can do with
Swift that is very difficult to do with C ( not a
developer’s written optimization )
• Swift by design is well optimized

8. Strict

9. Strict
• Means no uninitialized variables ( nil object
reference )
• Detects and catches it on compile time
• “Optional type” if something might or might
not be there

10. Similarities to Objective-C
• Basic numeric types (Int, UInt, Float, Double)
• Most C operators are carried over to Swift, but there are some new
operators
• Curly braces are used to group statements.
• Variables are assigned using an equals sign, but compared using
two consecutive equals signs. A new identity operator, ===, is
provided to check if two data elements refer to the same object.
• Square brackets are used with arrays, both to declare them and to
get a value at a given index in one of them.
• Control statements, for, while, if, switch are similar, but have
extended functionality, e.g. a for in that iterates over any collection
type, a switch that takes non-integer cases, etc.
• Class methods are inherited, just like instance methods; self in class
methods is the class the method was called on.

11. Differences from Objective-C
• Statements do not need to end with a
semicolon (;), though they must be used to
allow more than one statement on a line
• Strong typing
• No exception handling

12. Differences from Objective-C
…wait a minute, no exception handling?
Yes, no catch / try blocks but you can still utilize
Objective-C..and throw exception with
NSExceptions
Networking uses good ol’:
success/ failure callbacks
But suggested method is to use assert()

13. Syntax examples
• let maximumNumberOfLoginAttempts = 10
• var currentLoginAttempt = 0
• var x = 0.0, y = 0.0, z = 0.0
• println(friendlyWelcome)
..hey…psst…notice missing semicolons!

14. Syntax examples
Conditionals:
if turnipsAreDelicious {
println("Mmm, tasty turnips!”)
} else {
println("Eww, turnips are horrible.”)
}
Optional:
var serverResponseCode: Int? = 404

15. Syntax examples
• Assert() used for debugging purposes:
let age = -3
assert(age >= 0, "A person's age cannot be less than zero")
assertion is an effective way to ensure that such conditions are
highlighted and noticed during development, before your app is
published

16. Objective-C

17. Interactive Playgrounds

18. Thank you all!
And now get back to work!