Find errors in the code.
Difficulty: Impossible😈

class User {
    constructor(name, age) {
        this.name = name;
        this.age = age;
    }

    getProfile() {
        return Name: ${name}, Age: ${this.age}; 
    }

    isAdult() {
        return this.age > 18 ? "Yes" : false; 
    }

    updateProfile(newName, newAge) {
        if (newAge < 0) {
            throw "Age can't be negative"; 
        }
        this.name = newName ?? this.name; 
        this.age = newAge || this.age;
    }
}

const user = new User("John", 25);

console.log(user.getProfile());?2
user.updateProfile("", -5);

JavaScript Task
Get an array of letters from this string.
Difficulty: Easy😁

const str = 'abcde';

Find errors in the code.
Difficulty: Average🤨

function bubbleSort(arr) {
    let n = arr.length;

    for (let i = 0; i < n - 1; i++) {
        for (let j = 0; j < n - i - 1; j++) {
            if (j > arr[j + 1]) {
                let temp = j;
                arr[j] = arr[j + 1];
                arr[j + 1] = temp;
            }
        }

    }
    return arr; 
}

const numbers = [64, 34, 25, 12, 22, 11, 90];
const sortedNumbers = bubbleSort(numbers);
console.log("Sorted array:", sortedNumbers);

What will this code output? Spot the bug.
Difficulty: Average🤨

const obj = {
    value: 42,
    getValue: function() {
        setTimeout(function() {
            console.log(this.value); 
        }, 1000);
    }
};

obj.getValue();

JavaScript Task
Given an array. Print to the console all options for permuting the elements of this array.
Difficulty: Hard😤

const arr = [1, 2, 3, 4];

#css #border #cheatsheet

What will this code output? And why?
Difficulty: Average🤨

const numbers = [1, 2, 3, 4, 5];

const result = numbers.map(num => {
    if (num % 2 === 0) {
        return num * 2;
    } else {
        return num * 3;
    }
}).reduce((acc, curr) => acc + curr);

console.log(result);

Find errors in the code.
Difficulty: Average🤨

class Rectangle {
    constructor(width, height) {
        this.width = width;
        this.height = height;
    }

    getArea() {
        return width * height;
    }
}

const rect = new Rectangle(5, 10);
console.log("Area:", rect.getArea());

Useful CSS Tips

Outline

If you encounter issues with the positioning or visibility of elements on a page, this rule helps you instantly see all the blocks, their borders, and structure. It’s especially useful when working with complex layouts where elements might overlap or disappear.

* {
    outline: 4px solid green !important;
}

#css #tips #outline

JavaScript Task
Check that this string consists of numbers only.
Difficulty: Easy😁

string = "1234567890"