0xtmphey

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0xtmphey

@propertyWrapper
struct Lateinit<T> {
  private var _value: T?
  
  var wrappedValue: T {
    get { 
      guard let value = _value else {
        fatalError("Property being accessed without initialization")
      }
      return value

0xtmphey

class Activity {
  
  lateinit var notificationManager: NotificationManager
  
  override fun onCreate() {
    super.onCreate()
    
    // lateinit allows to access property without initialization and check for null
    // this will cause a crash
    notificationManager.readNotification()

0xtmphey

// Inject or instantiate the manager
lateinit var environmentManager: EnvironmentManager

// url address depending on DEFAULT_ENV
val serverAddress = environmentManager.get(EnvironmentVariables::baseUrl)

// change env
environmentManager.currentEnvironment = Environment.PRODUCTION

// Now you got the prod adrress

0xtmphey

class EnvironmentManager(
    // We use shared prefs to save currently selected env between app launches
    private val store: SharedPreferences
) {
    // This is a key for saving env in prefs
    private val currentEnvironmentKey = "current_environment"
    
    /*
    * Here we need to describe all our strings
    * for all of the supported environments.

0xtmphey

enum class Environment(val id: String) {
  DEVELOPMENT("development"),
  PRODUCTION("production");

  companion object {
    fun create(env: String): Environment =
      when (env) {
        "development" -> DEVELOPMENT
        "production" -> PRODUCTION
        else -> throw Exception("Unsupported environment $env")

0xtmphey

data class EnvironmentVariables(
    val baseUrl: String,
    val algoliaSearchKey: String
)

0xtmphey

android {
  buildTypes {
    debug {
      buildConfigField("String", "BASE_URL", "\"https://api-dev.myproject.com/\"")
    }
    release {
      buildConfigField("String", "BASE_URL", "\"https://api.myproject.com/\"")
    }
  }
}

0xtmphey

import Foundation

let date1Timestamp = Double(1545648417) // This is our date since 1970
let date2Str = "2018-12-07 05:32:54" // This is our date in String

// Here we create a `DateFormatter` which will allow us to parse our String
// Since we don't have a timezone data in our String, we indicate that this String in UTC
let date2Formatter = DateFormatter()
date2Formatter.dateFormat = "yyyy-MM-dd hh:mm:ss"
date2Formatter.timeZone = TimeZone(abbreviation: "UTC")!

0xtmphey

fun loadPosts() {
    retrofitService.getPosts()
        .filter { post -> post.author == me }
        .map { post -> createViewablePost(post) }
        .onComplete { posts -> view.showData(posts) }
        .onError { e -> view.showError(e) }
}