//save a value

sessionStorage.setItem("name", "Nicholas");



//retrieve item

var name = sessionStorage.getItem("name");



//get the key name for the first item

var key = sessionStorage.key(0);



//remove the key

sessionStorage.removeItem(key);



//check how many key-value pairs are present

var count = sessionStorage.length;

  

Here is the example in which we are checking that if there are values in the Session Storage , first load the arrays with those values. 



if (sessionStorage.length != 0){

    for(i=0;i<=90;i++){

         if(sessionStorage.getItem(i) != null) {

            array.push(i);

        }

}