Kontruksi Perangkat Lunak Modul 2

March 20, 2025
Muhamad Taufiq Hidayat

Berikut adalah implementasi dalam JavaScript untuk dua metode yang ada di modul:

Automata-based Construction (Menggunakan switch untuk menangani state)
Table-driven Construction (Menggunakan array untuk lookup nilai)

1. Automata-based Construction (FSM)

const readline = require("readline");

const rl = readline.createInterface({

input: process.stdin,

output: process.stdout

});

const State = {

START: "START",

GAME: "GAME",

PAUSE: "PAUSE",

EXIT: "EXIT"

};

let state = State.START;

function runStateMachine() {

console.log(`${state} SCREEN`);

rl.question("Enter Command: ", (command) => {

switch (state) {

case State.START:

if (command === "ENTER") state = State.GAME;

else if (command === "QUIT") state = State.EXIT;

break;

case State.GAME:

if (command === "ESC") state = State.PAUSE;

break;

case State.PAUSE:

if (command === "BACK") state = State.GAME;

else if (command === "HOME") state = State.START;

else if (command === "QUIT") state = State.EXIT;

break;

}

if (state !== State.EXIT) {

runStateMachine();

} else {

console.log("EXIT SCREEN");

rl.close();

}

});

}

runStateMachine();

Penjelasan:

Program ini berjalan dalam loop hingga pengguna memasukkan “QUIT”.
Menggunakan readline untuk membaca input dari terminal.
state berpindah berdasarkan input pengguna.

2. Table-driven Construction

Direct Access:

function getDaysPerMonth(month) {

const daysPerMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

return daysPerMonth[month - 1] || "Invalid month";

}

console.log(getDaysPerMonth(2)); // Output: 28

console.log(getDaysPerMonth(13)); // Output: Invalid month

Stair-step Access:

function getGradeByScore(studentScore) {

const grades = ["A", "AB", "B", "BC", "C", "D", "E"];

const rangeLimit = [80, 70, 65, 60, 50, 40, 0];

for (let i = 0; i < rangeLimit.length; i++) {

if (studentScore >= rangeLimit[i]) {

return grades[i];

}

return "E";

}

console.log(getGradeByScore(75)); // Output: AB

console.log(getGradeByScore(45)); // Output: D

Soal 1: Automata-based Construction (FSM)

Sebuah game memiliki tiga state utama:

START (awal permainan)
PLAYING (sedang bermain)
GAME OVER (permainan berakhir)

Aturan transisi antar state:

Dari START, jika pemain mengetik “PLAY”, permainan masuk ke state PLAYING.
Dari PLAYING, jika pemain mengetik “LOSE”, permainan masuk ke state GAME OVER.
Dari GAME OVER, jika pemain mengetik “RESTART”, permainan kembali ke state START.
Pemain bisa keluar kapan saja dengan mengetik “EXIT”.