Find the error in the code.
Difficulty: Average🤨

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

function sumArray(arr) {
    return arr.reduce((accumulator, current) => {
        return accumulator + current;
    }, 0);
}

console.log('Sum:', sumArray(numbers));

numbers = '1, 2, 3, 4, 5'; 
console.log('Sum:', sumArray(numbers));

JavaScript Task
Write a function isEven that takes a number as an argument and returns true if the number is even and false if it is odd.
Difficulty: Easy😁

function isEven(num) {
    
}

console.log(isEven(4));  
console.log(isEven(7)); 
console.log(isEven(0));  
console.log(isEven(-2));

Find the error in the code.
Difficulty: Average🤨

function processData(data) {
    let result = data.map(item => item.value);
    return result;
}

let inputData = null;

console.log(processData(inputData));

JavaScript Task
Remove all empty strings from the array.
Difficulty: Average🤨

let arr = [1, '', 2, 3, '', 5];

Find the error in the code.
Difficulty: Hard😤

function processArray(arr) {
    let result = [];
    
    arr.forEach(item => {
        if (item != '') { 
            result.push(item);
        } else if (typeof item === 'number') { 
            result.push(item * 2);
        }
    });

    return result;
}

let data = [1, '', 2, 3, '', 5, null, undefined, 'hello'];

console.log(processArray(data));

JavaScript Task
Display the following pyramid
Difficulty: Average🤨

1
22
333
4444
55555
666666
7777777
88888888
999999999

Find the error in the code.
Difficulty: Easy😁

let fruits = ['apple', 'banana', 'orange'];

for (let i = 0; i <= fruits.length; i++) { 
    console.log(fruits[i]);
}

JavaScript Task
Fill the array with random numbers from 1 to 100.
Difficulty: Easy😁

console.log(randomNumbers);