How to Edit and Remove item from sessionStorage

Question

This code to store items in sessionStorage so i want to add, edit , remove item and remove all my code worked well except remove item i don't know the reason

function clearItem () {
            for (var i = 0; i < sessionStorage.length; i++) {
                var a = sessionStorage.key(i);
                var b = sessionStorage.removeItem(a);
            }
        }

here's my code in jsfiddle

Answer 1

function clearItem () {
            for (var i = 0; i < sessionStorage.length; i++) {
                var a = sessionStorage.key(i);
                sessionStorage.removeItem(a);
            }
        }