implemented prime game

Makefile

@@ -10,6 +10,8 @@ brain-gcd:
 	node bin/brain-gcd.js
 brain-progression:
 	node bin/brain-progression.js
+brain-prime:
+	node bin/brain-prime.js
 make lint:
 	npx eslint .
 publish: 

bin/brain-prime.js

@@ -0,0 +1,6 @@
+#!/usr/bin/env node
+
+import app from '../src/index.js';
+import prime from '../src/prime.js';
+
+app(prime);

package.json

@@ -7,7 +7,8 @@
     "brain-even": "bin/brain-even.js",
     "brain-calc": "bin/brain-calc.js",
     "brain-gcd": "bin/brain-gcd.js",
-    "brain-progression": "bin/brain-progression.js"
+    "brain-progression": "bin/brain-progression.js",
+    "brain-prime": "bin/brain-prime.js"
   },
   "main": "index.js",
   "scripts": {

src/index.js

@@ -14,7 +14,6 @@ export default function app(game, questionsCount = countOfQuestions) {
   for (let i = 0; i < questionsCount; i += 1) {
     const { question, correctAnswer } = questionsAnswers[i];
     console.log(`Question: ${question}`);
-    console.log(correctAnswer);
     const answer = readlineSync.question('Your answer: ');
     if (answer !== correctAnswer) {
       console.log(`${answer} is wrong answer ;(. Correct answer was ${correctAnswer}.

src/prime.js

@@ -0,0 +1,27 @@
+import randomize from './utils/randomize.js';
+
+const isPrime = (num) => {
+  if (num < 2) {
+    return false;
+  }
+  const halfNum = Math.floor(num / 2);
+  for (let i = halfNum; i > 1; i -= 1) {
+    if (num % i === 0) {
+      return false;
+    }
+  }
+  return true;
+};
+export default function prime(questionCount = 3) {
+  const rules = 'Answer "yes" if given number is prime. Otherwise answer "no".';
+  const questionsAnswers = [];
+  for (let i = 0; i < questionCount; i += 1) {
+    const number = randomize(0, 100);
+    const correctAnswer = isPrime(number) ? 'yes' : 'no';
+    questionsAnswers.push({
+      question: number,
+      correctAnswer,
+    });
+  }
+  return { rules, questionsAnswers };
+}