how to store and extract local storage
let p1 = new Point(1,2);
let p2 = new Point(4,8);
let p3 = new Point(3,7);
// create a polygon using an array containing p1, p2, p3
let poly1 = new Polygon([p1,p2,p3]);
// store in local storage
localStorage.setItem("poly1",JSON.stringify(poly1));
// retrieve into new variable
let poly1Data = JSON.parse(localStorage.getItem("poly1"));storing and extracting from local storage
/* Storing object data in local storage */
let objectData = {
"data": "this is a line of text",
"anArray": [0,1,2,3,4,5],
"aBoolean": true
}
// convert object into a string
let jsonString = JSON.stringify(objectData);
// put it in local storage
localStorage.setItem("storage_key",jsonString);
// we also can use a variable to store the key value instead of using a string directly
let key = "storage_key";
localStorage.setItem(key,jsonString);
/* Retrieving object data from local storage */
let key = "storage_key"; // our key
// get the item from localStorage
let jsonString = localStorage.getItem(key);
// convert it back into an object
let objectData = JSON.parse(jsonString);Copyright © 2021 Codeinu
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