function generateReport() {
    let headRowArray = Array.from(document.getElementsByTagName('input'));

    let bodyRowArray = Array.from(document.querySelectorAll('tbody tr'));

    let textArea = document.getElementById('output');

    let indices = [];

    let employees = [];

    for (let i = 0; i < headRowArray.length; i++) {

        if (headRowArray[i].checked === true) {

            indices.push(i);

        }

    }

    for (let i = 0; i < bodyRowArray.length; i++) {

        let eInfo = {};

        let tdArray = Array.from(bodyRowArray[i].children);

        for (let j = 0; j < indices.length; j++) {

            let key = headRowArray[indices[j]].name.toLowerCase();

            let value = tdArray[indices[j]].textContent;

            eInfo[key] = value;

        }

        employees.push(eInfo);

    }

    let str = JSON.stringify(employees);

    textArea.textContent = str;
}