data class Student(val name: String, val city: String, val marks: Int)

fun main() {
    val students = listOf(
        Student("Asha", "Noida", 82),
        Student("Ravi", "Delhi", 74),
        Student("Meera", "Gurugram", 91)
    )
    val toppers = students.filter { it.marks >= 80 }.map { it.name }
    println(toppers)   // [Asha, Meera]
}

fun greet(name: String?): String {
    // ?: (Elvis operator) gives a default when name is null
    val safeName = name ?: "Guest"
    return "Hello, $safeName"
}

fun main() {
    println(greet("Asha"))  // Hello, Asha
    println(greet(null))     // Hello, Guest
}

import androidx.compose.foundation.layout.Column
import androidx.compose.material3.Button
import androidx.compose.material3.Text
import androidx.compose.runtime.*

@Composable
fun CounterScreen() {
    var count by remember { mutableStateOf(0) }
    Column {
        Text("Tapped $count times")
        Button(onClick = { count++ }) {
            Text("Tap me")
        }
    }
}

import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.launch

class NotesViewModel(private val repo: NotesRepository) : ViewModel() {
    private val _notes = MutableStateFlow<List<Note>>(emptyList())
    val notes: StateFlow<List<Note>> = _notes

    fun load() {
        viewModelScope.launch {
            _notes.value = repo.getAll()   // suspend function, off the main thread
        }
    }
}

import retrofit2.Retrofit
import retrofit2.converter.gson.GsonConverterFactory
import retrofit2.http.GET

data class Post(val id: Int, val title: String)

interface PostsApi {
    @GET("posts")
    suspend fun getPosts(): List<Post>
}

val api: PostsApi = Retrofit.Builder()
    .baseUrl("https://jsonplaceholder.typicode.com/")
    .addConverterFactory(GsonConverterFactory.create())
    .build()
    .create(PostsApi::class.java)

README checklist for each app
☐ One-line description of the problem it solves
☐ 3-4 screenshots or a short demo video
☐ Tech used: Kotlin, Compose, Room, Retrofit, ...
☐ How to build and run it
☐ What I would improve next
☐ Play Store link or APK release (if available)

Answer honestly
I enjoy designing screens and interactions        → Android app developer
I enjoy breaking things and checking quality      → Mobile QA engineer
I want to reach Android and iOS with one codebase → Cross-platform developer
I prefer databases, servers and APIs              → Mobile backend developer
Pick one primary role for the next six months.

Months 1-2: Kotlin fundamentals, OOP, collections, null safety
Month 3:    Jetpack Compose, state, navigation
Month 4:    Room, Retrofit, coroutines, ViewModel
Month 5:    Portfolio app 1 and 2, testing basics
Month 6:    App 3, Play Console testing track, applications

Company | Role | Where found | Date applied | Status | Next step
______  | ____ | ________    | __________   | ______ | _________
Weekly target: 10 tailored applications
Follow up after 7 days if no response