how to add data to an object in localstorage javascript code example

Example 1: js delete object in map

my_map.delete(id)

Example 2: how to get data from localstorage in javascript

//localStorage is an object, so values are stored by key name
//data from localStorage is always stored in strings
//usually the values at each key are stringified objects in JSON format, therefore we must parse them
var data = JSON.parse(localStorage.getItem("key name"));//make sure the "key name" exists in the localStorage

Example 3: how to add object to list in javascript

var a=[]
var b={};
a.push(b);