osualaFC

Interview Questions

Kotlin

Q1: What is a primary constructor in Kotlin? ☆☆

Answer: The primary constructor is part of the class header. Unlike Java, you don't need to declare a constructor in the body of the class. Here's an example:

osualaFC

/**
 * Fade a view to visible or gone. This function is idempotent - it can be called over and over again with the same 
 * value without affecting an in-progress animation.
 */
fun View.fadeTo(visible: Boolean, duration: Long = 500, startDelay: Long = 0, toAlpha: Float = 1f) {
    // Make this idempotent.
    val tagKey = "fadeTo".hashCode()
    if (visible == isVisible && animation == null && getTag(tagKey) == null) return
    if (getTag(tagKey) == visible) return

osualaFC

import timber.log.Timber
import kotlin.properties.ReadOnlyProperty
import kotlin.reflect.KProperty

class MyClass {
    // This will automatically have the TAG "MyClass"
    private val log by timber()
    
    fun logSomething() {
        log.i("Hello")

osualaFC

{
pokemon: [
{
id: 1,
num: "001",
name: "Bulbasaur",
img: "http://www.serebii.net/pokemongo/pokemon/001.png",
type: [
"Grass",
"Poison"