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",

src/app.js

@@ -1,3 +1,37 @@
 'use strict';
 
-// Write your code here
+const readline = require('readline');
+
+const { getBullsAndCows } = require('./modules/getBullsAndCows');
+const { checkIsValidUserInput } = require('./modules/checkIsValidUserInput');
+const { generateRandomNumber } = require('./modules/generateRandomNumber');
+
+const terminal = readline.createInterface(process.stdin, process.stdout);
+const randomNumber = generateRandomNumber();
+
+function tryGuess() {
+  terminal.question('Enter a 4-digit number: ', (userInput) => {
+    const userNumber = Number(userInput.trim());
+    const isValid = checkIsValidUserInput(userNumber);
+
+    if (isValid) {
+      if (userNumber === randomNumber) {
+        // eslint-disable-next-line no-console
+        console.log('Congratulations! You guessed the number.');
+
+        terminal.close();
+
+        return;
+      } else {
+        const result = getBullsAndCows(userNumber, randomNumber);
+
+        // eslint-disable-next-line no-console
+        console.log(`Result: \nbulls: ${result.bulls} \ncows: ${result.cows}`);
+      }
+    }
+
+    return tryGuess();
+  });
+}
+
+tryGuess();

src/modules/checkIsValidUserInput.js

@@ -9,7 +9,32 @@
  * @return {boolean} - True if the user input is valid, false otherwise
  */
 function checkIsValidUserInput(userInput) {
-  /* Write your code here */
+  if (isNaN(userInput)) {
+    // eslint-disable-next-line no-console
+    console.log('Invalid input. Please enter a 4-digit number.');
+
+    return false;
+  }
+
+  const numbers = String(userInput)
+    .split('')
+    .map((n) => Number(n));
+
+  if (numbers[0] === 0 || numbers.length !== 4) {
+    // eslint-disable-next-line no-console
+    console.log('Error. Enter a 4-digit number that doesnt start with 0.');
+
+    return false;
+  }
+
+  if (new Set(numbers).size !== numbers.length) {
+    // eslint-disable-next-line no-console
+    console.log('Error. Enter a 4-digit number that has only unique digits.');
+
+    return false;
+  }
+
+  return true;
 }
 
 module.exports = {

src/modules/generateRandomNumber.js

@@ -7,7 +7,19 @@
  * @return {number} A random 4-digit number
  */
 function generateRandomNumber() {
-  /* Write your code here */
+  const digits = [];
+
+  digits.push(Math.floor(Math.random() * 9) + 1);
+
+  while (digits.length < 4) {
+    const randomDigit = Math.floor(Math.random() * 10);
+
+    if (!digits.includes(randomDigit)) {
+      digits.push(randomDigit);
+    }
+  }
+
+  return Number(digits.join(''));
 }
 
 module.exports = {

src/modules/getBullsAndCows.js

@@ -13,7 +13,26 @@
  * Example: { bulls: 1, cows: 2 }
  */
 function getBullsAndCows(userInput, numberToGuess) {
-  /* Write your code here */
+  let bulls = 0;
+  let cows = 0;
+
+  const userArray = String(userInput).split('');
+  const guessArray = String(numberToGuess).split('');
+
+  for (let i = 0; i < userArray.length; i++) {
+    if (guessArray.includes(userArray[i])) {
+      if (guessArray[i] === userArray[i]) {
+        bulls++;
+      } else {
+        cows++;
+      }
+    }
+  }
+
+  return {
+    bulls,
+    cows,
+  };
 }
 
 module.exports = {