Escape from Java

Slides of the talk I gave at Kotlin Night Torino 2018

1. Escape from Java The Java Programming Language™
2. Rob
3. Why Kotlin?
4. Why Kotlin? Less Libraries
5. Why Kotlin? Less Libraries More readability
6. Why Kotlin? Less Libraries More readability Many functions out of the box
7. Why Kotlin? Less Libraries More readability Many functions out of the box
8. False myths
9. False myths Budget
10. False myths Budget Tooling
11. False myths Budget Tooling Learning curve
12. False myths Budget Tooling Learning curve
13. public class Model { private String property; private int anotherProperty; private float wowAnotherProperty; private double pleaseStahpDude; public String getProperty() { return property; } public void setProperty(String property) { this.property = property; } public int getAnotherProperty() { return anotherProperty; } public void setAnotherProperty(int anotherProperty) {
14. } public void setAnotherProperty(int anotherProperty) { this.anotherProperty = anotherProperty; } public float getWowAnotherProperty() { return wowAnotherProperty; } public void setWowAnotherProperty(float wowAnotherProperty) this.wowAnotherProperty = wowAnotherProperty; } public double getPleaseStahpDude() { return pleaseStahpDude; } public void setPleaseStahpDude(double pleaseStahpDude) { this.pleaseStahpDude = pleaseStahpDude; } }
15. public class Model { private String property; private int anotherProperty; private float wowAnotherProperty; private double pleaseStahpDude; public String getProperty() { return property; } public void setProperty(String property) { this.property = property; } public int getAnotherProperty() { return anotherProperty; } public void setAnotherProperty(int anotherProperty) { this.anotherProperty = anotherProperty; } public float getWowAnotherProperty() { return wowAnotherProperty; } public void setWowAnotherProperty(float wowAnotherProperty) { this.wowAnotherProperty = wowAnotherProperty; } public double getPleaseStahpDude() { return pleaseStahpDude; } public void setPleaseStahpDude(double pleaseStahpDude) { this.pleaseStahpDude = pleaseStahpDude; } }
16. public class Model { private String property; public String getProperty() { return property; } public void setProperty(String property) { this.property = property; } }
17. public class Model { private final String property; public Model(String property) { this.property = property; } public String getProperty() { return property; } }
18. import android.support.annotation.Nullable; public class Model { private final @Nullable String property; public Model(@Nullable String property) { this.property = property; } @Nullable public String getProperty() { return property; } }
19. public class Model implements Parcelable{ private final @Nullable String property; public Model(@Nullable String property) { this.property = property; } protected Model(Parcel in) { property = in.readString(); } @Override public void writeToParcel(Parcel dest, int flags) { dest.writeString(property); } @Override public int describeContents() { return 0; } public static final Creator<Model> CREATOR = new Creator<Model>() { @Override public Model createFromParcel(Parcel in) { return new Model(in); } @Override public Model[] newArray(int size) { return new Model[size]; } }; @Nullable public String getProperty() { return property; } }
20. import android.os.Parcelable import kotlinx.android.parcel.Parcelize @Parcelize data class Model(val property: String?) : Parcelable
21. AutoValue Guava Immutables Parceler Annotations
22. GSON uses Reflection
23. GSON uses Reflection Custom TypeAdapters
24. GSON uses Reflection Custom TypeAdapters Vimeo Stag to generate code
25. GSON uses Reflection Custom TypeAdapters Vimeo Stag to generate code Moshi
26. RxJava+ Retrofit
27. Coroutines+ Retrofit
28. Retrofit.Builder() .addCallAdapterFactory(RxJava2CallAdapterFactory.create()) .baseUrl(BuildConfig.API_ENDPOINT) .build()
29. Retrofit.Builder() .addCallAdapterFactory(RxJava2CallAdapterFactory.create()) .baseUrl(BuildConfig.API_ENDPOINT) .build() interface ApiService { @GET("home") fun home(): Single<HomeResponse> }
30. Retrofit.Builder() .addCallAdapterFactory(CoroutineCallAdapterFactory()) .baseUrl(BuildConfig.API_ENDPOINT) .build()
31. Retrofit.Builder() .addCallAdapterFactory(CoroutineCallAdapterFactory()) .baseUrl(BuildConfig.API_ENDPOINT) .build() interface ApiService { @GET("home") fun home(): Deferred<HomeResponse> }
32. Coroutines do not replace RxJava
33. Guava
34. Guava Collections getFirst() getLast() concat() addAll() contains() isEmpty() toImmutableList()
35. Guava Collections getFirst() getLast() concat() addAll() contains() isEmpty() toImmutableList() Strings join() split() trim() any() whitespace()
36. Guava Collections getFirst() getLast() concat() addAll() contains() isEmpty() toImmutableList() Strings join() split() trim() any() whitespace() Optionals
37. Guava Collections getFirst() getLast() concat() addAll() contains() isEmpty() toImmutableList() Strings join() split() trim() any() whitespace() Optionals Ranges
38. Guava Collections getFirst() getLast() concat() addAll() contains() isEmpty() toImmutableList() Strings join() split() trim() any() whitespace() Optionals Ranges
39. AutoValue Guava Immutables Parceler Annotations Guava Collections RetroLambda Project Lombok
41. open.nytimes.com @nytdev github.com/NYTimes developers.nytimes.com
42. QA &