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feat(challenges): add Go coding challenges (#2) #5

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157 changes: 157 additions & 0 deletions app/src/main/java/com/tamagotchi/code/data/ChallengesData.kt
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Expand Up @@ -1394,5 +1394,162 @@ object ChallengesData {
correctAnswerIndex = 0,
explanation = "Las funciones asíncronas se definen con 'async def'. Dentro de ellas se usa 'await' para llamar a otras funciones asíncronas."
),
// ========== GO ==========
CodingChallenge(
id = 211,
language = "Go",
type = "TRIVIA",
title = "Arrays vs Slices",
question = "¿Cuál es la diferencia principal entre un array [3]int y un slice []int en Go?",
options = listOf(
"Son sinónimos, el compilador los trata igual",
"El array tiene longitud fija y se copia por valor; el slice es una vista dinámica sobre un array subyacente",
"El slice solo puede contener enteros, el array cualquier tipo",
"Los arrays se asignan en el heap y los slices en el stack"
),
correctAnswerIndex = 1,
explanation = "En Go, [3]int es un valor de longitud fija que se copia completo al pasarlo a una función. []int es un slice: una estructura (puntero, longitud, capacidad) que apunta a un array subyacente y puede crecer con append()."
),
CodingChallenge(
id = 212,
language = "Go",
type = "PRINT",
title = "Longitud tras append",
question = "¿Qué imprime este código?",
codeSnippet = "package main\n\nimport \"fmt\"\n\nfunc main() {\n\ts := []int{1, 2, 3}\n\tt := append(s, 4)\n\tfmt.Println(len(s), len(t))\n}",
options = listOf(
"3 4",
"4 4",
"3 3",
"4 3"
),
correctAnswerIndex = 0,
explanation = "append puede reutilizar la capacidad del array subyacente, pero la variable 's' conserva su longitud original (3). El slice devuelto 't' tiene 4 elementos. Salida: '3 4'."
),
CodingChallenge(
id = 213,
language = "Go",
type = "DEBUG",
title = "Variable sin usar",
question = "Este código no compila en Go. ¿Por qué?",
codeSnippet = "package main\n\nimport \"fmt\"\n\nfunc main() {\n\tx := 5\n\tfmt.Println(\"listo\")\n}",
options = listOf(
"Falta inicializar x con var",
"Go no permite variables declaradas y nunca usadas; hay que eliminar x o usarla (o asignarla a _)",
"import \"fmt\" debe ir después del main",
":= solo es válido con variables de paquete"
),
correctAnswerIndex = 1,
explanation = "Go es estricto: 'declared and not used: x' es un error de compilación, no un warning. Soluciones típicas: borrar la variable, usarla, o asignarla al identificador en blanco _."
),
CodingChallenge(
id = 214,
language = "Go",
type = "TRIVIA",
title = "Esperar goroutines",
question = "¿Cuál es la forma idiomática de esperar a que un grupo de goroutines termine antes de salir del main?",
options = listOf(
"Dormir con time.Sleep(10 * time.Second)",
"Usar sync.WaitGroup: wg.Add(1) antes de lanzar y wg.Done() dentro de cada goroutine, luego wg.Wait()",
"Declarar main como func() error",
"Usar runtime.Goexit() en cada goroutine"
),
correctAnswerIndex = 1,
explanation = "El main termina cuando acaba su función: si lanza goroutines sin sincronizar, pueden no ejecutarse nunca. sync.WaitGroup cuenta las goroutines activas y Wait() bloquea hasta que todas llamen a Done(). Sleep es un antipadrón: depende del tiempo, no del trabajo real."
),
CodingChallenge(
id = 215,
language = "Go",
type = "PRINT",
title = "Orden de defer",
question = "¿Qué imprime este código?",
codeSnippet = "package main\n\nimport \"fmt\"\n\nfunc main() {\n\tdefer fmt.Println(\"a\")\n\tfmt.Println(\"b\")\n}",
options = listOf(
"a luego b",
"b luego a",
"Solamente b",
"Solamente a"
),
correctAnswerIndex = 1,
explanation = "'defer' pospone la llamada hasta el final de la función circundante: primero se ejecuta Println(\"b\") y, al retornar main, se ejecuta la diferida 'a'. Si hay varios defer, se ejecutan en orden LIFO (pila)."
),
CodingChallenge(
id = 216,
language = "Go",
type = "TRIVIA",
title = "Visibilidad en Go",
question = "En Go, ¿cómo se hace que un identificador (función, struct, campo) sea público/exportado fuera de su paquete?",
options = listOf(
"Añadiendo la palabra clave public",
"Comenzando el nombre con letra mayúscula",
"Marcándolo con el comentario //export",
"Declarándolo dentro de un bloque exported{}"
),
correctAnswerIndex = 1,
explanation = "Go no tiene modificadores public/private: la visibilidad la decide la primera letra. 'Sumar' es accesible desde otros paquetes; 'sumar' es privado del paquete. Aplica a funciones, tipos, campos y métodos."
),
CodingChallenge(
id = 217,
language = "Go",
type = "PRINT",
title = "Longitud y capacidad",
question = "¿Qué imprime este código?",
codeSnippet = "package main\n\nimport \"fmt\"\n\nfunc main() {\n\ts := []int{1, 2, 3, 4}\n\tp := s[1:3]\n\tfmt.Println(len(p), cap(p))\n}",
options = listOf(
"2 2",
"2 3",
"3 3",
"2 4"
),
correctAnswerIndex = 1,
explanation = "p = s[1:3] toma los elementos {2, 3}: longitud 2. Pero la capacidad llega hasta el final del array subyacente: desde el índice 1 hay 3 elementos (2, 3, 4), así que cap = 3. Por eso append a p puede modificar s[3]."
),
CodingChallenge(
id = 218,
language = "Go",
type = "TRIVIA",
title = "Manejo de errores",
question = "¿Cuál es la convención idiomatica de manejo de errores en Go?",
options = listOf(
"Lanzar excepciones con try/catch",
"Retornar el error como último valor y comprobar 'if err != nil' en la llamada",
"Usar códigos de retorno negativos",
"Registrar el error en un log global y continuar"
),
correctAnswerIndex = 1,
explanation = "Go no usa excepciones para errores recuperables: las funciones devuelven (valor, error) y el llamador inspecciona 'if err != nil { ... }'. Existe panic/recover, pero se reserva para fallos irrecuperables del programa."
),
CodingChallenge(
id = 219,
language = "Go",
type = "PRINT",
title = "Sombras dentro de un bloque",
question = "¿Qué imprime este código?",
codeSnippet = "package main\n\nimport \"fmt\"\n\nfunc main() {\n\tx := 1\n\tif x > 0 {\n\t\tx := 2\n\t\tfmt.Println(x)\n\t}\n\tfmt.Println(x)\n}",
options = listOf(
"1 luego 1",
"2 luego 2",
"2 luego 1",
"Error: redeclaración de x"
),
correctAnswerIndex = 2,
explanation = "'x := 2' dentro del if crea una NUEVA variable que 'sombrea' (shadows) a la exterior solo dentro de ese bloque: imprime 2 dentro y 1 fuera. Ojo con este bug clásico al reusar := en lugar de =."
),
CodingChallenge(
id = 220,
language = "Go",
type = "PRINT",
title = "defer con argumentos",
question = "¿Qué imprime este código? (sin salto de línea, es un Print)",
codeSnippet = "package main\n\nimport \"fmt\"\n\nfunc main() {\n\tfor i := 0; i < 3; i++ {\n\t\tdefer fmt.Print(i)\n\t}\n}",
options = listOf(
"012",
"210",
"222",
"000"
),
correctAnswerIndex = 1,
explanation = "Los argumentos de una llamada diferida se evalúan EN EL MOMENTO del defer (i vale 0, 1, 2), pero las llamadas se ejecutan al final en orden LIFO: 2, 1, 0 → imprime '210'."
),
)
}
2 changes: 1 addition & 1 deletion app/src/main/java/com/tamagotchi/code/feature/focus/FocusScreen.kt
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Expand Up @@ -97,7 +97,7 @@ fun TimerPanel(
var tempTopic by remember { mutableStateOf("Kotlin") }
var showDropdown by remember { mutableStateOf(false) }

val topics = listOf("Kotlin", "JavaScript", "PHP", "Python", "SQL", "Clean Code", "Git", "Estructuras de Datos")
val topics = listOf("Kotlin", "JavaScript", "PHP", "Python", "Go", "SQL", "Clean Code", "Git", "Estructuras de Datos")

Column(
modifier = Modifier.fillMaxWidth(),
Expand Down
4 changes: 2 additions & 2 deletions app/src/main/java/com/tamagotchi/code/feature/learn/LearnScreen.kt
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Expand Up @@ -129,8 +129,8 @@ fun BadgesPanel(viewModel: PetViewModel) {
)
Spacer(modifier = Modifier.height(12.dp))

val languages = listOf("Kotlin", "JavaScript", "PHP", "Python")
val languageKeyMap = mapOf("Kotlin" to "KOTLIN", "JavaScript" to "JS", "PHP" to "PHP", "Python" to "PYTHON")
val languages = listOf("Kotlin", "JavaScript", "PHP", "Python", "Go")
val languageKeyMap = mapOf("Kotlin" to "KOTLIN", "JavaScript" to "JS", "PHP" to "PHP", "Python" to "PYTHON", "Go" to "GO")

Column(verticalArrangement = Arrangement.spacedBy(8.dp)) {
languages.forEach { langName ->
Expand Down
2 changes: 1 addition & 1 deletion app/src/main/java/com/tamagotchi/code/feature/settings/SettingsLanguageScreen.kt
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Expand Up @@ -39,7 +39,7 @@ fun SettingsLanguageScreen(
stringResource(R.string.topic_data_structures)
)

val allLanguages = listOf("Kotlin", "JavaScript", "Python", "PHP")
val allLanguages = listOf("Kotlin", "JavaScript", "Python", "PHP", "Go")

Scaffold(
containerColor = Color.Transparent,
Expand Down
1 change: 1 addition & 0 deletions app/src/main/java/com/tamagotchi/code/ui/components/TopicIcons.kt
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Expand Up @@ -12,6 +12,7 @@ fun topicIconRes(topic: String): Int = when {
topic.contains("JavaScript", ignoreCase = true) -> R.drawable.ic_lang_javascript
topic.contains("Python", ignoreCase = true) -> R.drawable.ic_lang_python
topic.contains("PHP", ignoreCase = true) -> R.drawable.ic_lang_php
topic.contains("Go", ignoreCase = true) -> R.drawable.ic_lang_go
topic.contains("SQL", ignoreCase = true) -> R.drawable.ic_lang_sql
topic.contains("Git", ignoreCase = true) -> R.drawable.ic_lang_git
topic.contains("Clean Code", ignoreCase = true) || topic.contains("clean_code", ignoreCase = true) -> R.drawable.ic_lang_cleancode
Expand Down
20 changes: 20 additions & 0 deletions app/src/main/res/drawable/ic_lang_go.xml
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@@ -0,0 +1,20 @@
<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="24dp"
android:height="24dp"
android:viewportWidth="256"
android:viewportHeight="256">
<path
android:fillColor="#00ADD8"
android:pathData="M48,24 L208,24 A32,32 0 0,1 240,56 L240,128 L16,128 L16,56 A32,32 0 0,1 48,24 Z M16,144 L240,144 L240,200 A32,32 0 0,1 208,232 L48,232 A32,32 0 0,1 16,200 Z" />
<path
android:fillColor="#FFFFFF"
android:pathData="M78,52 A26,34 0 1,0 78,118 A26,34 0 1,0 78,52 Z M178,52 A26,34 0 1,0 178,118 A26,34 0 1,0 178,52 Z" />
<path
android:fillColor="#0B2B33"
android:pathData="M86,68 A12,16 0 1,0 86,96 A12,16 0 1,0 86,68 Z M186,68 A12,16 0 1,0 186,96 A12,16 0 1,0 186,68 Z" />
<path
android:fillColor="#FFFFFF"
android:pathData="M152,168 L196,168 A28,28 0 0,1 196,220 L152,220 A28,28 0 0,1 152,168 Z M166,182 L184,182 A14,14 0 0,1 184,206 L182,196 L166,196 Z"
android:fillType="evenOdd" />
</vector>
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