8.Sudomu

function solve() {
    let table = document.querySelector('table');
    let quickCheckBtn = document.querySelector('.buttons input[type="submit"]');
    let clearBtn = document.querySelector('.buttons input[type="reset"]');

    quickCheckBtn.addEventListener('click', function(e) {
        e.preventDefault();
        checkSudoku();
    })

    clearBtn.addEventListener('click', function(e) {
        e.preventDefault();
        clear();
    });

    function clear () {
        document.getElementById('check').textContent = "";
        let tableInputs = document.querySelectorAll('tbody tr td input');
        for (let input of tableInputs) {
            input.value = "";
        }
    }

    function checkSudoku () {
        let rowsColsArray = [];
        let tableRows = table.querySelectorAll('tr');
        let col1 = '';
        let col2 = '';
        let col3 = '';
        let isValid = true;

        for (let row of tableRows) {
            let currentRow = '';
            let rowValues = Array.from(row.querySelectorAll('td'));
            col1 += rowValues[0].querySelector('input').value;
            col2 += rowValues[1].querySelector('input').value;
            col3 += rowValues[2].querySelector('input').value;
            currentRow = rowValues[0].querySelector('input').value + rowValues[1].querySelector('input').value + rowValues[2].querySelector('input').value
            rowsColsArray.push(currentRow);
        }

        rowsColsArray.push(col1);
        rowsColsArray.push(col2);
        rowsColsArray.push(col3);

        for (let element of rowsColsArray) {
            if (!element.includes('1') || !element.includes('2') || !element.includes('3')) {
                isValid = false;
                break;
            }
        }

        if (isValid) {
            table.style.border = '2px solid green';
            document.getElementById('check').textContent = "Success!";
        } else {
            table.style.border = '2px solid red';
            document.getElementById('check').textContent = "Keep trying ...";
        }
    }
}