cassiozen

val a = "Kotlin"
val b: String? = null
println(a?.length) // 6
println(b?.length) // null

cassiozen

val len = if (nullableGreeting != null) {
    nullableGreeting.length
} else {
    0
}

cassiozen

var nullableGreeting: String? = "Hello, World"
nullableGreeting = null // Works

cassiozen

var greeting: String = "Hello, World"
greeting = null // Compilation Error

cassiozen

suspend fun getStatus(): List<String> {
    val currentUserDeferred = someApi.fetchUser()
    val currentCompanyDeferred = someApi.fetchCompany()
    return listOf(currentUserDeferred.await(), currentCompanyDeferred.await())
}

cassiozen

async function getStatus() {
    const currentUserPromise = someApi.fetchUser();
    const currentCompanyPromise = someApi.fetchCompany();
    return await Promise.all([currentUserPromise, currentCompanyPromise]);
}

cassiozen

data class Movie(
  val name: String, 
  val rating: Int, 
  val director: String
)
val movie1 = Movie("Back to the Future", 5, "Bob Zemeckis")
val movie1 = Movie("Star Wars: Episode IV - A New Hope", 5, "George Lucas")

cassiozen

const movie1 = {
    name: "Back to the Future",
    rating: 5,
    director: "Bob Zemeckis"
}
const movie2 = {
    name: "Star Wars: Episode IV - A New Hope",
    rating: 5,
    director: "George Lucas"
}

cassiozen

class Monster(val name: String, val color: String, val numEyes: Int) {
  fun speak(likes: String):String {
      return "My name is $name and I like $likes"
  }
}
var nhama = Monster("Nhama", "red", 1)
// Kotlin doesn't have a `new` keyword - you instantiate a class by calling it directly
nhama.speak("guacamole")
// "My name is Nhama and I like guacamole"

cassiozen

class Monster {
  constructor(name, color, numEyes) {
    this.name = name;
    this.color = color;
    this.numEyes = numEyes;
  }
  speak(likes) {
      return `My name is ${this.name} and I like ${likes}`;
  }
}