These codes work with all browsers except Explorer

Question

I wrote some Javascript code that works perfectly in all major browsers. Of course I made sure that none of this would be executed by Internet Explorer by creating a function that figures out what browser the user is using.

Here's the problem however: Even if I told IE not to execute the code, the browser still reads all of my Javascript and since it finds something it doesn't recognise it stops running any other Javascript.

The only thing I could think of doing was creating a function that would return if the user is using IE, but that doesn't seem to work since I think the problem comes from IE initially parsing my script and not being able to understand modern JS syntax.

Here's a simplified version of my code:

let table_sort_elements = document.querySelectorAll('.table_sort');
if(table_sort_elements)
{
    table_sort_elements = Array.isArray(table_sort_elements) ? table_sort_elements : Object.values(table_sort_elements);
    table_sort_elements.forEach(table_sort_element=>{
        let thead_cells = table_sort_element.querySelectorAll('thead>tr>*');
        if(thead_cells)
        {
            thead_cells = Array.from(thead_cells);

            thead_cells.forEach((thead_cell, index)=>{
                thead_cell.addEventListener('click', function(){
                    this.classList.toggle('asc');
                    sortTableByColumn(table_sort_element, index, !this.classList.contains('asc'));
                });
            });
        }
    });
}


function sortTableByColumn(table, column, desc=false) 
{
    let tbody = table.querySelector('tbody'),
        rows  = tbody.querySelectorAll('tr');

    rows  = rows.isArray ? rows : Object.values(rows);

    function compare(a, b) {
        // console.log(a.children[column], b.children[column]);
        let aText = a.children[column].innerText.trim(),
            bText = b.children[column].innerText.trim();
        
        return (aText < bText) ? -1 : 1;
    }

    rows.sort(compare);

    if(desc) rows.reverse();

    tbody.innerHTML = '';

    let i = 0;
    while (i<rows.length) {
        tbody.appendChild(rows[i]);
        i++;
    }
}




/* html table filter javaScript code start */
function filter_table(This, table_id)
{
    let recordLists = document.querySelectorAll(`#${table_id}>*`);
    if(recordLists)
    {
        hide_tr(recordLists);
        recordLists.forEach(recordList=>{
            let str   = recordList.innerText.toLowerCase(),
                value = This.value.toLowerCase();

            if(str.indexOf(value)>=0)
            {
                recordList.style.display = '';
            }
        });
    }
}


function hide_tr(recordLists) {
    recordLists.forEach(recordList=>{
        recordList.style.display = 'none';
    });
}
/* html table filter javaScript code end */