add task solution

src/app.js

@@ -1,3 +1,60 @@
+/* eslint-disable no-console */
 'use strict';
 
-// Write your code here
+const { generateRandomNumber } = require('./modules/generateRandomNumber');
+const { checkIsValidUserInput } = require('./modules/checkIsValidUserInput');
+const { getBullsAndCows } = require('./modules/getBullsAndCows');
+const numberToGuess = generateRandomNumber();
+const errorMessage = 'Please ender correct number! ';
+const getQuestion = (prevAnswer) =>
+  prevAnswer === errorMessage
+    ? errorMessage
+    : 'Try to guess 4-digit number again! ';
+
+const getFinalMessage = (answer) => {
+  let message;
+
+  if (!checkIsValidUserInput(answer)) {
+    message = errorMessage;
+  } else {
+    const { bulls, cows } = getBullsAndCows(+answer.trim(), numberToGuess);
+
+    message = `Your results are: bulls: ${bulls}, cows: ${cows}`;
+  }
+
+  return message;
+};
+
+const logMessage = (message) =>
+  message !== errorMessage ? console.log(message) : '';
+
+const readline = require('node:readline');
+const rl = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout,
+});
+
+rl.question(`Try to guess 4-digit number `, (answer1) => {
+  const message1 = getFinalMessage(answer1);
+
+  logMessage(message1);
+
+  if (message1 !== 'You won! Congratulations!') {
+    rl.question(getQuestion(message1), (answer2) => {
+      const message2 = getFinalMessage(answer2);
+
+      logMessage(message2);
+
+      if (message2 !== 'You won! Congratulations!') {
+        rl.question(getQuestion(message2), (answer3) => {
+          const message3 = getFinalMessage(answer3);
+
+          if (message3 !== 'You won! Congratulations!') {
+            console.log('You lost!');
+          }
+          rl.close();
+        });
+      }
+    });
+  }
+});

src/modules/checkIsValidUserInput.js

@@ -9,7 +9,21 @@
  * @return {boolean} - True if the user input is valid, false otherwise
  */
 function checkIsValidUserInput(userInput) {
-  /* Write your code here */
+  const input = new Set(userInput.split(''));
+  const startsWith0 = userInput.trim()[0] === '0';
+  const isLongEnough = input.size !== 4;
+
+  if (startsWith0 || isLongEnough) {
+    return false;
+  }
+
+  for (const num of input.values()) {
+    if (isNaN(+num)) {
+      return false;
+    }
+  }
+
+  return true;
 }
 
 module.exports = {

src/modules/generateRandomNumber.js

@@ -7,7 +7,15 @@
  * @return {number} A random 4-digit number
  */
 function generateRandomNumber() {
-  /* Write your code here */
+  const getNumber = () => Math.random().toString().slice(2, 6).split('');
+
+  let set = new Set(getNumber());
+
+  while (set.size < 4 || set.has('0')) {
+    set = new Set(getNumber());
+  }
+
+  return +[...set.values()].join('');
 }
 
 module.exports = {

src/modules/getBullsAndCows.js

@@ -13,7 +13,19 @@
  * Example: { bulls: 1, cows: 2 }
  */
 function getBullsAndCows(userInput, numberToGuess) {
-  /* Write your code here */
+  const initialScore = { bulls: 0, cows: 0 };
+  const normUserInput = '' + userInput;
+  const normNumberToGuess = '' + numberToGuess;
+
+  for (let i = 0; i < normNumberToGuess.length; i++) {
+    if (normUserInput[i] === normNumberToGuess[i]) {
+      initialScore.bulls = initialScore.bulls + 1;
+    } else if (normNumberToGuess.includes(normUserInput[i])) {
+      initialScore.cows = initialScore.cows + 1;
+    }
+  }
+
+  return initialScore;
 }
 
 module.exports = {