add solution

.github/workflows/test.yml-template

@@ -0,0 +1,23 @@
+name: Test
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [20.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm install
+    - run: npm test

package.json

@@ -18,7 +18,7 @@
   "license": "GPL-3.0",
   "devDependencies": {
     "@mate-academy/eslint-config": "latest",
-    "@mate-academy/scripts": "^1.8.6",
+    "@mate-academy/scripts": "^1.9.12",
     "eslint": "^8.57.0",
     "eslint-plugin-jest": "^28.6.0",
     "eslint-plugin-node": "^11.1.0",
@@ -27,5 +27,8 @@
   },
   "mateAcademy": {
     "projectType": "javascript"
+  },
+  "dependencies": {
+    "readline": "^1.3.0"
   }
 }

src/app.js

@@ -1,3 +1,39 @@
 'use strict';
 
-// Write your code here
+'use strict';
+
+const readline = require('readline');
+const { generateRandomNumber } = require('./generateRandomNumber');
+const { checkIsValidUserInput } = require('./checkIsValidUserInput');
+const { getBullsAndCows } = require('./getBullsAndCows');
+
+const terminal = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout,
+});
+
+function playGame() {
+  const secretNumber = generateRandomNumber().toString();
+
+  function askGuess() {
+    terminal.question('Enter your number: ', (userInput) => {
+      if (!checkIsValidUserInput(userInput)) {
+        return askGuess();
+      }
+
+      const { bulls } = getBullsAndCows(secretNumber, userInput);
+
+      if (bulls === 4) {
+        terminal.close();
+      } else {
+        askGuess();
+      }
+    });
+  }
+
+  askGuess();
+}
+
+module.exports = {
+  playGame,
+};

src/modules/checkIsValidUserInput.js

@@ -5,11 +5,27 @@
  * Valid user input is a 4-digit number that does not start with 0
  * and does not contain any duplicate digits.
  *
- * @param {string} userInput - The user input
- * @return {boolean} - True if the user input is valid, false otherwise
+ * @param {string} userInput
+ * @return {boolean}
  */
 function checkIsValidUserInput(userInput) {
-  /* Write your code here */
+  if (userInput.length !== 4) {
+    return false;
+  }
+
+  const numbers = userInput.split('');
+
+  if (!numbers.every((num) => /^\d$/.test(num))) {
+    return false;
+  }
+
+  if (userInput[0] === '0') {
+    return false;
+  }
+
+  const uniqueNumber = new Set(numbers);
+
+  return uniqueNumber.size === 4;
 }
 
 module.exports = {

src/modules/generateRandomNumber.js

@@ -4,10 +4,22 @@
  * Generate a random 4-digit number that does not start with 0
  * and does not contain any duplicate digits.
  *
- * @return {number} A random 4-digit number
+ * @return {number}
  */
 function generateRandomNumber() {
-  /* Write your code here */
+  const numbers = [];
+
+  numbers.push(Math.floor(Math.random() * 9) + 1);
+
+  while (numbers.length < 4) {
+    const randomNumber = Math.floor(Math.random() * 10);
+
+    if (!numbers.includes(randomNumber)) {
+      numbers.push(randomNumber);
+    }
+  }
+
+  return Number(numbers.join(''));
 }
 
 module.exports = {

src/modules/getBullsAndCows.js

@@ -7,13 +7,39 @@
  * Assume that the user input and the number to guess
  * are always 4-digit numbers.
  *
- * @param {number} userInput - The user input
- * @param {number} numberToGuess - The number to guess
- * @return {object} An object containing the number of bulls and cows.
- * Example: { bulls: 1, cows: 2 }
+ * @param {string} userInput
+ * @param {string} numberToGuess
+ * @return {object}
  */
 function getBullsAndCows(userInput, numberToGuess) {
-  /* Write your code here */
+  const fixedUserInput = String(userInput);
+  const fixedNumberToGuess = String(numberToGuess);
+
+  let bulls = 0;
+  let cows = 0;
+
+  const userNumbers = [];
+  const guessNumbers = [];
+
+  for (let i = 0; i < 4; i++) {
+    if (fixedUserInput[i] === fixedNumberToGuess[i]) {
+      bulls++;
+    } else {
+      userNumbers.push(fixedUserInput[i]);
+      guessNumbers.push(fixedNumberToGuess[i]);
+    }
+  }
+
+  guessNumbers.forEach((number) => {
+    const cowIndex = userNumbers.indexOf(number);
+
+    if (cowIndex !== -1) {
+      cows++;
+      userNumbers.splice(cowIndex, 1);
+    }
+  });
+
+  return { bulls, cows };
 }
 
 module.exports = {