Move games logic to /src/games according to new architecture & Add new calc-game

Author: thedoorbell

bin/brain-calc.js

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+#!/usr/bin/env node
+
+import run from '../src/games/calc.js';
+
+run();

src/games/calc.js

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+import playGame from '../index.js';
+
+const rules = 'What is the result of the expression?';
+
+const calc = () => {
+  const firstNum = Math.floor(Math.random() * 50) + 1;
+  const secondNum = Math.floor(Math.random() * 25) + 1;
+  const operations = ['+', '-', '*'];
+  const operation = operations[Math.floor(Math.random() * 3)];
+  const expression = `${firstNum} ${operation} ${secondNum}`;
+  let correctAnswer = 0;
+
+  switch (operation) {
+    case '+':
+      correctAnswer = firstNum + secondNum;
+      break;
+    case '-':
+      correctAnswer = firstNum - secondNum;
+      break;
+    case '*':
+      correctAnswer = firstNum * secondNum;
+      break;
+    default:
+      break;
+  }
+
+  return [expression, String(correctAnswer)];
+};
+
+export default () => playGame(rules, calc);

src/games/even.js

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+import playGame from '../index.js';
+
+const rules = 'Answer "yes" if the number is even, otherwise answer "no".';
+
+const askIsEven = () => {
+  const evenNum = Math.floor(Math.random() * 100) + 1;
+  const correctAnswer = evenNum % 2 === 0 ? 'yes' : 'no';
+  return [evenNum, correctAnswer];
+};
+
+export default () => playGame(rules, askIsEven);