devmentor-pl · kacpermak1 · Feb 15, 2025 · Feb 15, 2025 · Feb 15, 2025 · Feb 16, 2025
diff --git a/01/assets/js/app.js b/01/assets/js/app.js
@@ -1,4 +1,50 @@
 const a = '4.2';
 const b = 9;
 
-console.log(a, b);
+console.log(a, b);
+
+// 1. Check the types of variables
+console.log("Type of variable a: ", typeof a); // string
+console.log("Type of variable b: ", typeof b); // number
+
+// 2. Arithmetic operations
+// Convert 'a' to a number to avoid string concatenation
+const addition = parseFloat(a) + b;
+
+const subtraction = a - b;
+const multiplication = a * b;
+const division = a / b;
+const modulo = a % b;
+const exponentiation = a ** b;
+
+// console.log("Addition: ", addition);
+// console.log("Subtraction: ", subtraction);
+// console.log("Multiplication: ", multiplication);
+// console.log("Division: ", division);
+// console.log("Modulo: ", modulo);
+// console.log("Exponentiation: ", exponentiation);
+
+// 3. Check which result is greater than 20, which is less than 20 and which is equal to 20
+const results = [
+    { name: 'Addition', value: addition },
+    { name: 'Subtraction', value: subtraction },
+    { name: 'Multiplication', value: multiplication },
+    { name: 'Division', value: division },
+    { name: 'Modulo', value: modulo },
+    { name: 'Exponentiation', value: exponentiation }
+];
+
+results.forEach(result => {
+    if (!result || typeof result.value !== 'number' || typeof result.name !== 'string') {
+        console.error('Invalid result object encountered:', result);
+        return;
+    }
+
+    if (result.value > 20) {
+        console.log(`${result.name} result ${result.value} is greater than 20.`);
+    } else if (result.value < 20) {
+        console.log(`${result.name} result ${result.value} is less than 20.`);
+    } else {
+        console.log(`${result.name} result ${result.value} is equal to 20.`);
+    }
+});
diff --git a/01/index.html b/01/index.html
@@ -7,6 +7,6 @@
     <title>devmentor.pl - JS BASICS - #01</title>
 </head>
 <body>
-
+    <script src="assets/js/app.js"></script>
 </body>
 </html>
diff --git a/02/app.js b/02/app.js
@@ -1,7 +1,49 @@
 
 /* rozwiązanie z pętlą for */
-const x = 4;
 
+const input = prompt('Enter the multiplication factor: ');
+const x = Number(input);
 
+if (isNaN(x)) {
+    console.error(`Provided value (${input}) is not a number`);
+} else if (!Number.isInteger(x)) {
+    console.error(`Provided value (${x}) is not an integer`);
+} else if (x < 1 || x > 9) {
+    console.error(`Provided value (${x}) is not between 1 and 9`);
+} else {
+    for (let i = 1; i <= 9; i++) {
+        console.log(`${x} * ${i} = ${x * i}`);
+    }
+}
 
-/* rozwiązanie z pętlą while  */
+/* rozwiązanie z pętlą while  */
+
+const baseInput = prompt('Enter the base number for exponentiation (a): ');
+const a = Number(baseInput);
+
+const exponentInput = prompt('Enter the exponent (n): ');
+const n = Number(exponentInput);
+
+if (isNaN(a) || !Number.isInteger(a)) {
+  console.error(`Base must be an integer. Provided value: ${baseInput}`);
+} else if (isNaN(n) || !Number.isInteger(n) || n < 1) {
+  console.error(`Exponent must be an integer greater than or equal to 1. Provided value: ${exponentInput}`);
+} else {
+  let i = 0;
+  let result = 1;
+  let chain = "";
+
+  while (i < n) {
+    result *= a;
+
+    if (i === 0) {
+      chain += a;
+    } else {
+      chain += " * " + a;
+    }
+
+    i++;
+  }
+
+  console.log(`${chain} = ${result}`);
+}
diff --git a/02/index.html b/02/index.html
@@ -7,6 +7,6 @@
     <title>devmentor.pl - JS BASICS - #02</title>
 </head>
 <body>
-
+    <script src="./app.js"></script>
 </body>
 </html>
diff --git a/03/app.js b/03/app.js
@@ -7,12 +7,45 @@ const c = randomNumber(min, max);
 
 console.log(a, b, c);
 
-
-
-
-
-
+function getSum(a, b, c) {
+    a = parseInt(a, 10);
+    b = parseInt(b, 10);
+    c = parseInt(c, 10);
+
+    return a + b + c - Math.min(a, b, c);
+}
+
+const isEven = function (a) {
+    if (typeof a !== 'number') return null;
+
+    return a % 2 === 0;
+};
+
+function showInfo(a, b) {
+    let message;
+
+    switch (b) {
+        case null:
+            message = `The provided argument ${a} is not a number.`;
+            break;
+        case true:
+            message = `The provided argument ${a} is even.`;
+            break;
+        case false:
+            message = `The provided argument ${a} is odd.`;
+            break;
+        default:
+            message = `Invalid value for the second parameter: ${b}`;
+    }
+
+    console.log(message);
+}
 
 function randomNumber(min, max) {
     return Math.round((Math.random() * (max - min)) + min);
-}
+}
+
+const sum = getSum(a, b, c);
+const even = isEven(sum);
+
+showInfo(sum, even);
diff --git a/04/app.js b/04/app.js
@@ -0,0 +1,33 @@
+const createArray = (min, max) => {
+    const arr = [];
+
+    for (let i = 0; i < 20; i++) {
+        arr.push(getRandomInt(min, max));
+    }
+    return arr;
+};
+
+const getRandomInt = (min, max) => {
+    return Math.floor(Math.random() * (max - min + 1)) + min; //Assumption: both min & max parameters are integers
+};
+
+const getLargest = arr => {
+    if (!Array.isArray(arr) || arr.length === 0) return null;
+
+    return [...arr].sort((a, b) => b - a).slice(0, 10);
+};
+
+
+const getAverage = arr => {
+    if (!Array.isArray(arr) || arr.length === 0) return null;
+
+    return arr.reduce((sum, num) => sum + num, 0) / arr.length;
+};
+
+const testArr = createArray(10, 200);
+const largestNumbersArray = getLargest(testArr);
+const averageFromLargest = getAverage(largestNumbersArray);
+
+console.log(testArr);
+console.log(largestNumbersArray);
+console.log(averageFromLargest);
diff --git a/04/index.html b/04/index.html
@@ -7,6 +7,6 @@
     <title>devmentor.pl - JS BASICS - #04</title>
 </head>
 <body>
-
+    <script src="./app.js"></script>
 </body>
 </html>
diff --git a/05/app.js b/05/app.js
@@ -0,0 +1,61 @@
+class Student {
+    constructor(firstName, lastName) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+        this.grades = {};
+    }
+
+    // Static method to normalize subject names
+    static normalizeSubject(subject) {
+        return subject.trim().toLowerCase() //this could be adjusted further if we decide to handle spaces in subject names differently, perhaps by adding: .replace(/\s+/g, '_')
+    }
+
+    // Static method to compute the average of an array of numbers.
+    static computeAverage(arr) {
+        if (!Array.isArray(arr) || arr.length === 0) return null;
+
+        const sum = arr.reduce((acc, num) => acc + num, 0);
+
+        return sum / arr.length;
+    }
+
+    addGrade(subject, grade) {
+        if (typeof subject !== 'string' || subject.trim() === '') {
+            throw new Error('Subject must be a non-empty string');
+        }
+        if (typeof grade !== 'number' || isNaN(grade)) {
+            throw new Error('Grade must be a valid number');
+        }
+
+        const subjectKey = Student.normalizeSubject(subject);
+
+        if (!this.grades[subjectKey]) {
+            this.grades[subjectKey] = [];
+        }
+
+        this.grades[subjectKey].push(grade);
+    }
+
+    getAverageGrade(subject) {
+        const gradesToCalculate = (typeof subject === 'string' && subject.trim())
+            ? (this.grades[Student.normalizeSubject(subject)] || [])
+            : Object.values(this.grades).flat();
+
+        return Student.computeAverage(gradesToCalculate);
+    }
+}
+
+const student = new Student('Jan', 'Kowalski');
+student.addGrade('maths', 4);
+student.addGrade('maths', 6);
+student.addGrade('english', 3);
+student.addGrade('english', 6);
+
+const avgMath = student.getAverageGrade('maths');
+const avgEnglish = student.getAverageGrade('english');
+const overallAvg = student.getAverageGrade();
+
+console.log(student);
+console.log('Average Maths:', avgMath);
+console.log('Average English:', avgEnglish);
+console.log('Overall Average:', overallAvg);
diff --git a/05/index.html b/05/index.html
@@ -7,6 +7,6 @@
     <title>devmentor.pl - JS BASICS - #05</title>
 </head>
 <body>
-
+    <script src="./app.js"></script>
 </body>
 </html>
-Original file line number
+Diff line change
@@ Expand Up / @@ -7,6 +7,6 @@ @@
         <title>devmentor.pl - JS BASICS - #01</title>
     </head>
     <body>
+        <script src="assets/js/app.js"></script>
     </body>
     </html>