Добавлено приложение quiz таблица умножения

example_2/js/index.js

+// const userName = prompt('Как ваше имя?');
+
+// alert(`Привет ${userName},\n\` как ваши дела?`);
+
+const userErrors = [
+  [1, 0],
+  [2, 0],
+  [3, 0],
+  [4, 0],
+  [5, 0],
+  [6, 0],
+  [7, 0],
+  [8, 0],
+  [9, 0],
+];
+
+let corretAnswer = 0;
+let wrongAnswer = 0;
+let questionCount = 0;
+
+const quizeMode = prompt('Choose difficult mode, enter easy,normal,hard,all')
+  .toLowerCase()
+  .trim();
+
+switch (quizeMode) {
+  case 'easy':
+    {
+      alert('easy');
+      while (true) {
+        const firstRandomValue = Math.floor(Math.random() * 2 + 1);
+        const secondRandomValue = Math.floor(Math.random() * 2 + 1);
+
+        const userAnswer = prompt(
+          `What is ${firstRandomValue} * ${secondRandomValue} `
+        );
+        if (userAnswer === null) break;
+
+        let userNumber = parseInt(userAnswer);
+        while (isNaN(userNumber)) {
+          userNumber = parseInt(
+            prompt('You enter not a number, please enter number')
+          );
+          if (!isNaN(userNumber)) break;
+        }
+        questionCount++;
+
+        if (userNumber === firstRandomValue * secondRandomValue) {
+          corretAnswer++;
+        } else {
+          wrongAnswer++;
+          userErrors[firstRandomValue - 1][1]++;
+          if (firstRandomValue !== secondRandomValue) {
+            userErrors[secondRandomValue - 1][1]++;
+          }
+        }
+      }
+
+      const sortedErrors = userErrors.sort((a, b) => a[1] - b[1]).slice(-3);
+      let errorsMessage = '';
+      for (let i = 0; i < sortedErrors.length; i++) {
+        errorsMessage += `Multyply by ${sortedErrors[i][0]}: x ${sortedErrors[i][1]}\n`;
+      }
+
+      const messageResult =
+        `Question qty: ${questionCount}\n` +
+        `wrong answer qty: ${wrongAnswer}\n` +
+        `correct answer qty: ${corretAnswer}\n` +
+        errorsMessage;
+
+      alert(messageResult);
+    }
+
+    break;
+  case 'normal':
+    {
+      alert('normal');
+      while (true) {
+        const firstRandomValue = Math.round(Math.random() * (5 - 3) + 3);
+        const secondRandomValue = Math.round(Math.random() * (5 - 3) + 3);
+
+        const userAnswer = prompt(
+          `What is ${firstRandomValue} * ${secondRandomValue} `
+        );
+        if (userAnswer === null) break;
+
+        let userNumber = parseInt(userAnswer);
+        while (isNaN(userNumber)) {
+          userNumber = parseInt(
+            prompt('You enter not a number, please enter number')
+          );
+          if (!isNaN(userNumber)) break;
+        }
+        questionCount++;
+
+        if (userNumber === firstRandomValue * secondRandomValue) {
+          corretAnswer++;
+        } else {
+          wrongAnswer++;
+          userErrors[firstRandomValue - 1][1]++;
+          if (firstRandomValue !== secondRandomValue) {
+            userErrors[secondRandomValue - 1][1]++;
+          }
+        }
+      }
+
+      const sortedErrors = userErrors.sort((a, b) => a[1] - b[1]).slice(-3);
+      let errorsMessage = '';
+      for (let i = 0; i < sortedErrors.length; i++) {
+        errorsMessage += `Multyply by ${sortedErrors[i][0]}: x ${sortedErrors[i][1]}\n`;
+      }
+
+      const messageResult =
+        `Question qty: ${questionCount}\n` +
+        `wrong answer qty: ${wrongAnswer}\n` +
+        `correct answer qty: ${corretAnswer}\n` +
+        errorsMessage;
+
+      alert(messageResult);
+    }
+
+    break;
+  case 'hard':
+    {
+      alert('hard');
+      while (true) {
+        const firstRandomValue = Math.round(Math.random() * (9 - 1) + 1);
+        let secondRandomValue = Math.round(Math.random() * (9 - 1) + 1);
+        while (
+          secondRandomValue === 1 ||
+          secondRandomValue === 2 ||
+          secondRandomValue === 5
+        ) {
+          secondRandomValue = Math.round(Math.random() * (9 - 1) + 1);
+        }
+
+        const userAnswer = prompt(
+          `What is ${firstRandomValue} * ${secondRandomValue} `
+        );
+        if (userAnswer === null) break;
+
+        let userNumber = parseInt(userAnswer);
+        while (isNaN(userNumber)) {
+          userNumber = parseInt(
+            prompt('You enter not a number, please enter number')
+          );
+          if (!isNaN(userNumber)) break;
+        }
+        questionCount++;
+
+        if (userNumber === firstRandomValue * secondRandomValue) {
+          corretAnswer++;
+        } else {
+          wrongAnswer++;
+          userErrors[firstRandomValue - 1][1]++;
+          if (firstRandomValue !== secondRandomValue) {
+            userErrors[secondRandomValue - 1][1]++;
+          }
+        }
+      }
+
+      const sortedErrors = userErrors.sort((a, b) => a[1] - b[1]).slice(-3);
+      let errorsMessage = '';
+      for (let i = 0; i < sortedErrors.length; i++) {
+        errorsMessage += `Multyply by ${sortedErrors[i][0]}: x ${sortedErrors[i][1]}\n`;
+      }
+
+      const messageResult =
+        `Question qty: ${questionCount}\n` +
+        `wrong answer qty: ${wrongAnswer}\n` +
+        `correct answer qty: ${corretAnswer}\n` +
+        errorsMessage;
+
+      alert(messageResult);
+    }
+    break;
+  case 'all':
+    alert('all');
+    break;
+  default:
+    alert('You enter invalid value, setting default mode all');
+    break;
+}