add prime game

Author: daria-z

Makefile

@@ -13,6 +13,9 @@ brain-calculator:
 brain-progression:
 	node bin/brain-progression.js
 
+brain-prime:
+	node bin/brain-prime.js
+
 publish:
 	npm publish --dry-run
 

bin/brain-prime.js

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

src/cli.js

@@ -3,5 +3,6 @@ import evenChecking from './games/evenChecking.js';
 import calculator from './games/brain-calculator.js';
 import gcd from './games/gcd.js';
 import progression from './games/brain-progression.js';
+import prime from './games/brain-prime.js';
 
-export { userGreeting, evenChecking, calculator, gcd, progression };
+export { userGreeting, evenChecking, calculator, gcd, progression, prime };

src/games/brain-prime.js

@@ -0,0 +1,7 @@
+import gamesWrapper from "./utils/gamesWrapper.js";
+import { rule, logic } from "./gamesLogic/prime.js";
+
+export default () => {
+  gamesWrapper(rule, logic);
+};
+

src/games/gamesLogic/prime.js

@@ -0,0 +1,21 @@
+import generateRandomNumber from "../utils/generateRandomNumber.js";
+
+export const rule = 'Answer "yes" if given number is prime. Otherwise answer "no".';
+
+export const logic = () => {
+  const number = generateRandomNumber(1, 10);
+  const isPrime = (number) => {
+    if (number <= 1) {
+      return 'no';
+    }
+
+    for (let i = 2; i < number; i++)
+      if (number % i == 0) {
+        return 'no';
+      }
+      return 'yes';
+    }
+
+  return [number, isPrime(number)];
+};
+