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FRP MY SWIFT!
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About me
Afonso
Graça
! @ Unbabel
Building mobile apps
(and some web too)
Livetweeting
" @AfonsoGraca
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How did you get to ?
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Option 1
Go along R. Alves Redol, Av. de António José de
Almeida and Av. Defensores de Chaves
Then take Av. de Berna, Av. Calouste Gulbenkian
and Av. Ceuta to R. Fradesso da Silveira
Finally turn to R. Rodrigues de Faria
…Aaaand drop me at no. 103.
How did you get to ?
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Option 2
Take me to Lx Factory please!
Option 1
Go along R. Alves Redol, Av. de António José de
Almeida and Av. Defensores de Chaves
Then take Av. de Berna, Av. Calouste Gulbenkian
and Av. Ceuta to R. Fradesso da Silveira
Finally turn to R. Rodrigues de Faria
…Aaaand drop me at no. 103.
How did you get to ?
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Option 2
Take me to Lx Factory please!
Option 1
Go along R. Alves Redol, Av. de António José de
Almeida and Av. Defensores de Chaves
Then take Av. de Berna, Av. Calouste Gulbenkian
and Av. Ceuta to R. Fradesso da Silveira
Finally turn to R. Rodrigues de Faria
…Aaaand drop me at no. 103.
How did you get to ?
Imperative Declarative
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Imperative vs. Declarative
How you are going to achieve
Keep state and mutate it
What you are want to achieve
Context-Independent
Simpler, more readable
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Should I start to code
only in a declarative way?
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Should I start to code
only in a declarative way?
Probably not.
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We should strive to achieve
a nice balance
between both in our codebases
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We should strive to achieve
a nice balance
between both in our codebases
How? Functional Reactive Programming
(from now on known as FRP)
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FRP
‣Sequences
‣Transformations
‣Bindings
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Sequences
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Transformations
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Bindings
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RxSwift
Sequences ▸ Observables
Transformations ▸ map, filter, reduce…
Bindings ▸ Bind and Subscribe
And never forget the DisposeBag
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How did it help me?
Demo time
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It’s Magic!
Same functionality
70% less code
Optimized version
60% less code
Overall better Readability
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Want to go deeper?
‣ github.com/afonsograca/pixels_camp_frp_my_swift
‣ github.com/ReactiveX/RxSwift/
‣ rxmarbles.com
‣ reactivex.io
‣ github.com/artsy/eidolon/
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Afonso
Graça
" @AfonsoGraca
# afonsograca.com
$ afonsograca
Thank
You!