From Objective-C to Swift

www.erlang-solutions.com

ERLANG SOLUTIONS GET2GETHER TIGRE 2016

FROM OBJECTIVE-C TO SWIFT

HELLO!

Pablo Villarpablo@inakanetworks.com@pablolvillarwww.erlang-solutions.com www.inaka.net

EXPERIENCES WE'VE LEARNEDFROM SOMESWIFTFEATURES

How has this new language affected our

developer lives?

1.SWIFT ISSTATICALLYTYPED

SWIFT IS STATICALLY TYPED

▸ Type checking at compile-time▸ We can catch mistakes at earlier stages▸ Less runtime crashes▸ Less magic, more knowledge

Swift (Static Types)

More restrictions when writing code.

It's harder to get along with the compiler and be good friends, but that's a good thing.

SWIFT IS STATICALLY TYPED

OBJ-C (Dynamic Types)

More freedom when writing code.

However, this magic comes with the high cost of experiencing undesired behavior or potential crashes at runtime.

2.SWIFT HAS GOTOPTIONALS

You need to define specific paths for null vs non-null scenarios.

You are not allowed to perform operations on a nil variable that's supposed not to be nil.

SWIFT HAS GOT OPTIONALS

You can call a method with a pointer variable that is nil, and nothing will happen.

This no-op leads to unpredictable behavior.

SWIFT HAS GOT OPTIONALS

▸ We are forced to deal with null types▸ Our code becomes safer▸ We get used not to forget the error paths▸ We code with intention▸ Sometimes, we discover hidden scenarios that

haven't been defined in the specs yet.▹ In consequence, we become more proactive

in the development loop.

3.SWIFT TAKES AFUNCTIONALAPPROACH

SWIFT TAKES A FUNCTIONAL APPROACH

▸ Enums on steroids▸ Pattern matching▸ Functions as first-class citizens

▹ Perfect fit for completion closures▹ Higher order functions▹ Map, filter, reduce

▸ The importance of:▹ Immutability▹ Value types▹ Avoiding state

▸ Testable code as a consequence

4.SWIFT IS APROTOCOLORIENTEDPROGRAMMINGLANGUAGE

SWIFT IS A PROTOCOL ORIENTED PROGRAMMING LANGUAGE

▸ Protocols in Swift have been given more features and are more encouraged

▸ Favor composition over inheritance▸ Code is more extensible and flexible▸ In combination with generics, they become way

powerful

USING PLAIN INHERITANCE

USING PROTOCOL COMPOSITION

5.SWIFT HAS GOTGENERICS

SWIFT HAS GOT GENERICS

▸ With generics, we can solve general problems writing less code...

▸ This concept encourages us to:▹ Think of more layers of abstraction▹ Solve problems in a generic way▹ Find out common code architecture patterns in our

apps and generalize them▹ Write more open-source code

6.MODELSIN SWIFT ARE MOREPOWERFUL

MODELS IN SWIFT ARE MORE POWERFUL

You can define classes, structs and enums.

They all have the same power at their core.

You can define classes, structs and enums.

While classes is the only one that has real power, structs and enums are vastly poor in comparison (they come from C).

▸ Structs and Enums have been leveled up▸ We started to use them much more▸ We have learned:

▹ The value of value types▹ How to avoid side effects▹ Pattern-matching

▹ Why the if clause can be avoided▹ The importance of immutability

MODELS IN SWIFT ARE MORE POWERFUL

7.SWIFT IS EASIER TOREAD

SWIFT IS EASIER TO READ, WRITE, MAINTAIN, ETC...

▸ Cleaner syntax▸ Better expressiveness▸ Much more friendly▸ More similar to modern languages▸ Encourages more devs to learn it

▹ Community is getting way bigger

bye-bye-brackets.png

8.SWIFT IS

OPENSOURCE

SWIFT IS OPEN SOURCE!

▸ Language is evolving around the community▹ Proposals are encouraged

▹ So are discussions▹ Much more documentation▹ More people getting involved

▸ Bring Swift to other platforms▹ Linux▹ Android▹ Windows

WRAPPING UP...

IN CONCLUSION

Swift has changed the way we program and how we think of programming.

We've got less error prone code and more solid codebases.

We are also learning from other paradigms, which makes us more flexible and open-minded.

THANK YOU!

Any questions?pablo@inakanetworks.com@pablolvillarwww.erlang-solutions.com www.inaka.net

From Objective-C to Swift

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