javascript counter code example

Example 1: python counter

>>> Counter('abracadabra').most_common(3)
[('a', 5), ('r', 2), ('b', 2)]

Example 2: python counter

sum(c.values())                 # total of all counts
c.clear()                       # reset all counts
list(c)                         # list unique elements
set(c)                          # convert to a set
dict(c)                         # convert to a regular dictionary
c.items()                       # convert to a list of (elem, cnt) pairs
Counter(dict(list_of_pairs))    # convert from a list of (elem, cnt) pairs
c.most_common()[:-n-1:-1]       # n least common elements
c += Counter()                  # remove zero and negative counts

Example 3: js increment safety value html

function addRow(tableID) {

        var table = document.getElementById(tableID);

        var rowCount = document.getElementById(tableID).getElementsByTagName('tbody')
        [1].getElementsByTagName('tr').length;
        var row = table.insertRow(rowCount +1);

        var cell1 = row.insertCell(0);
        var element1 = document.createElement("input");
        element1.type = "hidden";
        element1.name = "Q[]";
        element1.value = rowCount +1;
        cell2.appendChild(element1);
        cell2.innerHTML = rowCount +1;
}

function deleteRow(tableID) {
        try {
        var table = document.getElementById(tableID);
        var rowCount = table.rows.length;

        for(var i=0; i<rowCount; i++) {
            var row = table.rows[i];
            var chkbox = row.cells[0].childNodes[0];
            if(null != chkbox && true == chkbox.checked) {
                table.deleteRow(i);
                rowCount--;
                i--;
            }


        }
        }catch(e) {
            alert(e);
        }
}