Question

I am creating the map as follows:

    var employeeMap = new Object();
   addElement(employeeMap , 1, "ABC");
   addElement(employeeMap , 2, "ABCD");

    alert(getElement(employeeMap,1)); // ABC

    function addElement(map,key,value){
        map[key] = value;
        return map;
    }

    function getElement(map,key){
        return map[key];
    }

How to delete a key-value pair from the map ? Is setting the map[key] = null the only option ?

Thanks,
Shikha

Answer 1

To actually remove the key/value pair, use delete: https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Operators/delete

So you could create a function to remove elements:

function deleteElement(map, key)) {
    if (map.hasOwnProperty(key) {
        delete map[key];
    }
}

And call it like:

deleteElement(employeeMap, 2);

UPDATE:

But as I’m reading, delete returns true if it’s successful, and false only if it cannot be deleted (for several reasons). So i guess the real version would be what the other answer has:

function deleteElement(map, key)) {
    return (delete map[key]);
}