add node game

Author: daria-z

bin/brain-gcd.js

@@ -0,0 +1,4 @@
+#!/usr/bin/env node
+import { gcd } from '../src/cli.js';
+
+gcd();

src/cli.js

@@ -1,5 +1,6 @@
 import userGreeting from './games/userGreeting.js';
 import evenChecking from './games/evenChecking.js';
 import calculator from './games/calculator.js';
+import gcd from './games/gcd.js';
 
-export { userGreeting, evenChecking, calculator };
+export { userGreeting, evenChecking, calculator, gcd };

src/games/gcd.js

@@ -0,0 +1,32 @@
+import generateRandomNumber from "./utils/generateRandomNumber.js";
+import greeting from "./utils/greeting.js";
+import askUser from "./utils/askUser.js";
+
+export default () => {
+  const userName = greeting();
+
+  console.log('Find the greatest common divisor of given numbers.');
+
+  for (let i = 1; i <= 3; i += 1) {
+    const number1 = generateRandomNumber(1, 20);
+    const number2 = generateRandomNumber(1, 20);
+
+    const nod = (a, b) => {
+      while (a !== b) {
+        if (a > b) {
+          a = a - b;
+        } else {
+          b = b - a;
+        }
+      }
+      return a;
+    }
+
+    if (askUser(userName, `${number1} ${number2}`, nod(number1, number2)) === false) {
+      return;
+    }
+
+    console.log('Correct!');
+  }
+  console.log(`Congratulations, ${userName}!`);
+};

src/games/utils/askUser.js

@@ -5,7 +5,7 @@ export default (name, question, correctAnswer) => {
 
   const userAnswer = readlineSync.question('Your answer: ');
 
-  if (userAnswer !== correctAnswer) {
+  if (userAnswer !== correctAnswer.toString()) {
     console.log(`'${userAnswer}' is wrong answer ;( .Correct answer was '${correctAnswer}'.`);
     console.log(`Let's try again, ${name}!`);
     return false;