magdamiu

users.filter{ user -> user.job == Job.Developer }
    .map{ developer -> developer.birthDate.dayOfMonth }
    .filter { birthDay -> birthDay <= 10 }
    .min()

magdamiu

users.filter{ it.job == Job.Developer }
    .map{ it.birthDate.dayOfMonth }
    .filter{ it <= 10 }
    .min()

magdamiu

class Book(val title: String?, val publishYear: Int?)

fun displayBookDetails(book: Book) {
    val title = book.title ?: 
throw IllegalArgumentException("Title required")
    val publishYear = book.publishYear ?: return

    println("$title: $publishYear")
}

magdamiu

class Book(val title: String?, val publishYear: Int?)

fun displayBookDetails(book: Book) {
    val title = book.title
    if (title == null)
        throw IllegalArgumentException("Title required")
    val publishYear = book.publishYear
    if (publishYear == null) return

    println("$title: $publishYear")

magdamiu

data class PathParts(val directory: String, val fileName: String)

fun splitPath(path: String) =
    PathParts(
        path.substringBeforeLast('/', ""),
        path.substringAfterLast('/'))

magdamiu

data class GetFile(val d: String, val n: String)

val pattern = Regex("(.+)/([^/]*)")

fun files(ph: String): PathParts {
  val match = pattern.matchEntire(ph)
        ?: return PathParts("", ph)

  return PathParts(match.groupValues[1],
      match.groupValues[2])

magdamiu

def room_version = "2.2.6"

implementation "androidx.room:room-runtime:$room_version"
annotationProcessor "androidx.room:room-compiler:$room_version"

magdamiu

import android.content.Context;
import android.content.SharedPreferences;

public class ApplicationData {
    private static final String APP_KEY = "android_course_key";

    // save a String value by key
    public static void setStringValueInSharedPreferences(Context context, String key, String value) {
        SharedPreferences sharedPreferences = context.getSharedPreferences(ApplicationData.APP_KEY,
                Context.MODE_PRIVATE);

magdamiu

// manifest add => <uses-permission android:name="android.permission.CAMERA" />

import static android.Manifest.permission.CAMERA;

private static final int REQUEST_CODE_CAMERA = 23;


if (ContextCompat.checkSelfPermission(StylesActivity.this, CAMERA) != PackageManager.PERMISSION_GRANTED) {
    // unhappy path
    ActivityCompat.requestPermissions(StylesActivity.this, new String[]{CAMERA}, REQUEST_CODE_CAMERA);

magdamiu

private void setupSwipeToRefresh() {
    swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {
            // Make sure you call swipeRefreshLayout.setRefreshing(false)
            // once the network request has completed successfully.
            inbox();
        }
    });
    // Configure the refreshing colors