vamsitallapudi

class Solution:
    def preorderTraversal(self, root: TreeNode) -> List[int]:
        # to return an empty array if root is empty
        if not root:
            return []
        # appending the root value in array and recursively going into left and right subtrees
        return [root.val] + self.preorderTraversal(root.left) + self.preorderTraversal(root.right)

vamsitallapudi

class TreeNode:
    def __init__(self, val=0, left=None, right=None):
        self.val = val
        self.left = left
        self.right = right


def initializeBinaryTree() -> TreeNode:
    a = TreeNode(2)
    b = TreeNode(3)

vamsitallapudi

class PrefLocalDataSourceImpl(val context: Context) : PrefRepo {
    override fun updateDarkMode(enabled: Boolean) {
        val sharedPreferences = context.getSharedPreferences("darkModePref", Context.MODE_PRIVATE)
        val editor = sharedPreferences.edit()
        editor.putBoolean("darkMode", true)
        editor.apply()
    }
}

vamsitallapudi

interface PrefRepo {
    fun updateDarkMode(enabled: Boolean)
}

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class PrefViewModel(private val prefRepo: PrefRepo): ViewModel() {
    fun updateDarkMode(enabled: Boolean) {
        prefRepo.updateDarkMode(enabled)
    }
}

vamsitallapudi

class PrefActivity : AppCompatActivity() {
    lateinit var viewModelFactory: PrefViewModelFactory
    private val btnDarkMode: Button = Button(this)
    private lateinit var viewmodel: PrefViewModel
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_pref)
        viewModelFactory = PrefViewModelFactory((application as DIExampleApp).repository)
        viewmodel= ViewModelProvider(this, viewModelFactory).get(PrefViewModel::class.java)
        btnDarkMode.setOnClickListener {

vamsitallapudi

import android.content.Context
import android.os.Bundle
import android.widget.Button
import androidx.appcompat.app.AppCompatActivity
import com.coderefer.newyorktimesapp.R

class PrefActivity : AppCompatActivity() {
    private val btnDarkMode: Button = Button(this)
    override fun onCreate(savedInstanceState: Bundle?) {

vamsitallapudi

package main.leetcode.kotlin.solidPrinciples.InterfaceSegregation

enum class TYPE {
    FAST_FOOD, DESSERT, INDIAN, CHINESE
}

interface Food {
    fun name(): String
    fun type(): TYPE
}

vamsitallapudi

package main.leetcode.kotlin.solidPrinciples.InterfaceSegregation

enum class TYPE {
    FAST_FOOD, DESSERT, INDIAN, CHINESE
}

interface Food {
    fun name(): String
    fun type(): TYPE
    fun boil() : String

vamsitallapudi

open class Bird{
    fun makeSound(){}
}

open class FlyingBird : Bird() {
    fun fly() {}
}

class Eagle : FlyingBird()
class Penguin : Bird()