What will this code output? Spot the bug.
Difficulty: Hard😤

for (var i = 0; i < 5; i++) {
    setTimeout(function() {
        console.log(i);
    }, 1000);
}

#git #commands #cheatsheet

Find the error in the code.
The answer should be: 15
Difficulty: Average😐

function sumArray(arr) {
    let sum = 0;
    arr.forEach(function(num) {
        sum =+ num;
    });
    return sum;
}

let numbers = [1, 2, 3, 4, 5];
console.log(sumArray(numbers));

How can the code be modified to handle both successful and failed promises?
Difficulty: Impossible😈

const promises = [
  Promise.resolve(1),
  Promise.reject(new Error('Error'))
];

Promise.all(promises)
  .then(results => console.log(results))
  .catch(error => console.error(error));

#html #cheatsheet

TEST
Write a calculator in JavaScript with minimal code
Difficulty: Easy🙂

function calculate(expression) {
    try {
        let result = eval(expression);
        if (isNaN(result)) {
            throw new Error("Invalid expression");
        }
        return result;
    } catch (e) {
        return "Error: " + e.message;
    }
}

let userInput = prompt("Enter an arithmetic expression (for example, 2 + 2):");

if (userInput !== null) {
    console.log("Result:", calculate(userInput));
}

#html #status

Find the error in the code.
The answer should be: 0, 1
Difficulty: Average😐

const createCounter = () => {
  let count = 0;
  return () => {
    console.log(count++);
  };
};

const counter1 = createCounter();
const counter2 = createCounter();

counter1(); 
counter2();

#JavaScript #methods #cheatsheet

Find the error in the code.
Difficulty: Easy😁

function greet(name) {
  console.log("Hello, " + name);
}

greet();