Documentation Index
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The exam mode at /examenes challenges students with a mixed set of questions drawn from all four math operations in a single session. Unlike the standalone exercise modes, the exam does not focus on one operation — each question can be addition, subtraction, multiplication, or division, selected at random. Students have 2 lives and must work through 5 questions to reach the success screen, after which they are automatically returned to their pet.
Exam structure
The exam session is governed by three top-level variables:
let vidas = 2;
let preguntas = 0;
const totalPreguntas = 5;
const tiposOperaciones = ["suma", "resta", "multiplicación", "división"];
generarPregunta checks whether all 5 questions have been answered. If they have, a success message is shown and the player is redirected to /mascota after 4 seconds. Otherwise, a random operation is picked from tiposOperaciones and new numbers are generated:
function generarPregunta() {
mensajeDiv.innerHTML = "";
if (preguntas >= totalPreguntas) {
mensajeDiv.innerHTML = '<div class="message success">¡Examen completado! ¡Excelente!</div>';
setTimeout(() => window.location.href = "/mascota", 4000);
return;
}
const tipo = tiposOperaciones[Math.floor(Math.random() * tiposOperaciones.length)];
let a = generarNumero(10);
let b = generarNumero(10);
let respuesta;
let preguntaTexto;
document.getElementById("titulo").textContent = `Exámenes: ejercicios de ${tipo}`;
switch (tipo) {
case "suma":
respuesta = a + b;
preguntaTexto = `¿Cuánto es ${a} + ${b}?`;
break;
case "resta":
if (b > a) [a, b] = [b, a];
respuesta = a - b;
preguntaTexto = `¿Cuánto es ${a} - ${b}?`;
break;
case "multiplicación":
respuesta = a * b;
preguntaTexto = `¿Cuánto es ${a} × ${b}?`;
break;
case "división":
respuesta = a;
preguntaTexto = `¿Cuánto es ${a * b} ÷ ${b}?`;
break;
}
// ... option generation follows
}
Question types
The switch statement in generarPregunta handles each operation type as follows:
| Operation | Key | How a and b are used | Answer |
|---|
| Addition | "suma" | Both drawn 1–10 | a + b |
| Subtraction | "resta" | Swapped if b > a to prevent negatives | a - b |
| Multiplication | "multiplicación" | Both drawn 1–10 | a × b |
| Division | "división" | a is the quotient; dividend shown is a × b | a (whole number guaranteed) |
Answer options
The exam renders 4 option buttons per question — 1 correct answer and 3 distractors. Options are built using a Set to guarantee uniqueness, then shuffled before display:
const opciones = new Set([respuesta]);
while (opciones.size < 4) {
const diferencia = Math.floor(Math.random() * 5) + 1;
const opcion = Math.random() < 0.5 ? respuesta + diferencia : respuesta - diferencia;
if (opcion >= 0) opciones.add(opcion);
}
Array.from(opciones).sort(() => Math.random() - 0.5).forEach((opcion) => {
const btn = document.createElement("button");
btn.textContent = opcion;
btn.onclick = () => verificarRespuesta(opcion, respuesta, btn);
opcionesDiv.appendChild(btn);
});
Correct and incorrect feedback
Answer verification disables all buttons immediately to prevent multiple selections, then applies a colour highlight and a short delay before advancing:
function verificarRespuesta(opcion, correcta, boton) {
document.querySelectorAll(".options button").forEach((btn) => btn.disabled = true);
if (opcion === correcta) {
boton.style.backgroundColor = "#a8f5a8";
mensajeDiv.innerHTML = '<div class="message success">¡Correcto!</div>';
setTimeout(() => {
preguntas++;
generarPregunta();
}, 1200);
return;
}
boton.style.backgroundColor = "#f8b0b0";
mensajeDiv.innerHTML = '<div class="message fail">Intenta otra vez.</div>';
if (vidas > 0) {
document.getElementById(`vida${vidas}`).src = vidaMenos;
vidas--;
}
setTimeout(() => {
if (vidas === 0) {
mensajeDiv.innerHTML = '<div class="message fail">Se acabaron las vidas. ¡Vuelve a intentarlo!</div>';
setTimeout(() => window.location.href = "/mascota", 3500);
} else {
preguntas++;
generarPregunta();
}
}, 1500);
}
- Correct — button turns green; next question after 1.2 s.
- Incorrect — button turns red; a life heart is replaced with
VidaMenos.png; next question (or failure screen) after 1.5 s.
End conditions
The exam session ends in one of two ways:
Success — all 5 questions answered
When preguntas >= totalPreguntas at the top of generarPregunta, a success banner (“¡Examen completado! ¡Excelente!”) is displayed. The player is automatically redirected to /mascota after 4 seconds.
Failure — both lives lost
When vidas reaches 0 after an incorrect answer, a failure banner (“Se acabaron las vidas. ¡Vuelve a intentarlo!”) is shown. The player is redirected to /mascota after 3.5 seconds.
The exam does not check or update tareaActual. Completing the exam — whether successfully or not — always redirects to /mascota without granting a stat boost. Pet stat rewards are only granted by the individual exercise modes (/ejercicio1–/ejercicio4) when the finished exercise type matches the active task.
