add prime

package.json

@@ -38,6 +38,7 @@
     "brain-calc": "dist/bin/brain-calc.js",
     "brain-gcd": "dist/bin/brain-gcd.js",
     "brain-balance": "dist/bin/brain-balance.js",
-    "brain-progression": "dist/bin/brain-progression.js"
+    "brain-progression": "dist/bin/brain-progression.js",
+    "brain-prime": "dist/bin/brain-prime.js"
   }
 }

src/bin/brain-prime.js

@@ -0,0 +1,5 @@
+#!/usr/bin/env node
+
+import playGame from '../games/prime';
+
+playGame();

src/games/prime.js

@@ -0,0 +1,20 @@
+import playGame from '..';
+import getRandomNumber from '../utils';
+
+const isPrime = (num, divisor) => {
+  if (divisor === 1) {
+    return 'yes';
+  }
+  return num % divisor === 0 ? 'no' : isPrime(num, divisor - 1);
+};
+const task = 'Is number prime?';
+
+export default () => {
+  const gameData = () => {
+    const number = getRandomNumber(100);
+    const question = `${number}`;
+    const correctAnswer = isPrime(number, number - 1);
+    return { question, correctAnswer };
+  };
+  return playGame(gameData, task);
+};