Kotlin — Curso (cero → héroe)

Cada ejercicio práctico del curso completo de Kotlin portado al arena — desde hello-world, lists/sets/maps, control de flujo, loops y sort hasta DSL builders. Cada reto incluye un visualizador animado en el IDE (diagrama de memoria, línea activa resaltada, narración) ajustado al concepto que enseña. Corre server-side vía Piston.

380 retos191 temas

Cómo funciona1Elige un reto2Lee los requisitos3Programa con IDE4Corre los tests

380 retos

easy5 min

¡Hola, Kotlin!

Conteo Total

Pertenencia a Set

Número a Palabra

Juego de Dados

Acciones de Botón (when)

Palabras que empiezan con 'l'

Ordenar Números Asc

Hello world · Exercise

Hello world · Three-row multiplication snippet

Basic types · Exercise

Basic types · Fuel economy: conversion and division

Collections · Exercise 1

Collections · Exercise 2

Collections · Exercise 3

Collections · Category Revenue Report

Collections · Hashtag Extractor

Collections · Inventory Value Pipeline

Control flow · Conditional: Dice game

Control flow · Conditional: Button actions

Control flow · Loops: Pizza slices (while)

Control flow · Loops: Fizz buzz

Control flow · Loops: Words starting with l

Functions · Exercise 1: circleArea

Functions · Exercise 2: circleArea single-expression

Functions · Exercise 3: intervalInSeconds with defaults

Functions · Lambda: Build URLs

Functions · Lambda: repeatN

Classes · Exercise 1: Employee data class

Classes · Exercise 2: Person, Name, Address, City

Classes · Exercise 3: RandomEmployeeGenerator

Null safety · Exercise: salaryById

Null safety · Exercise: resolveTheme with a nullable chain

Extension functions · Exercise 1

Extension functions · Exercise 2

Extension functions · Null-safe uppercase extension

Extension functions · Generic middle-element extension

Extension functions · Initials extension property

Scope functions · Exercise 1

Scope functions · Exercise 2

Scope functions · Build and configure a server config with apply

Scope functions · Null-safe role lookup with let and elvis

Scope functions · Log a transform pipeline with also, finish with let

Scope functions · Parse a nullable timeout with let and a fallback

Scope functions · Build a Canvas with a receiver lambda + apply

Scope functions · Null-safe transform with let + Elvis

Scope functions · Configure and compute in one block with run

Scope functions · Tap a chain with also to log the prices flowing through

Scope functions · Order summary with with

Lambda expressions with receiver · Exercise 1

Lambda expressions with receiver · Exercise 2

Lambda expressions with receiver · Exercise 3

Lambda expressions with receiver · Exercise 4 — convert normal lambda to receiver

Lambda expressions with receiver · Exercise 5 — html DSL

Lambda expressions with receiver · Exercise 6 — counter DSL

Lambda expressions with receiver · Exercise 7 — apply scope function

Lambda expressions with receiver · Exercise 8 — request builder

Lambda expressions with receiver · Exercise 9 — calculator DSL

Lambda expressions with receiver · Exercise 10 — build your own buildString

Lambda expressions with receiver · Build a Canvas DSL with a lambda receiver

Lambda expressions with receiver · Build the StringBuilder DSL with a receiver lambda

Lambda expressions with receiver · Button.onEvent: write a lambda with receiver

Lambda expressions with receiver · Write a receiver lambda: List<Int>.incremented() with buildList

Lambda expressions with receiver · Build the Menu DSL with a lambda with receiver

Lambda expressions with receiver · Build a type-safe HTML DSL with receiver lambdas

Lambda expressions with receiver · Join numbers with buildString { }

Lambda expressions with receiver · Build a Config DSL with a Receiver Lambda

Classes and interfaces · Exercise 1

Classes and interfaces · Exercise 2

Classes and interfaces · Exercise 3

Classes and interfaces · Exercise 4

Objects · Exercise 1

Objects · Exercise 2

Objects · Exercise 3

Objects · Singleton seat-booking registry

Objects · Companion factory with a private constructor

Objects · Anonymous Comparator object expression

Open and special classes · Exercise 1

Open and special classes · Exercise 2

Properties · Exercise 1