tofusoup429

let dataFetchedFromRemote = {
  name:"ABC corp",
  address: "4090  Shady Pines Drive Independence VA",
  postalCode: "24348"
}

localStorage.setItem('companyInfo', JSON.stringify(dataFetchedFromRemote))
//Before setting item in localStorage, you have to make the data string. 
//this code stores the dataFetchedFromRemote in the user's client

tofusoup429

let dataFetchedFromRemote = {
    name:"ABC corp",
    address: "4090  Shady Pines Drive Independence VA",
    postalCode: 24348
}
localStorage.setItem('companyInfo', JSON.stringify(dataFetchedFromRemote))
//this code stores the dataFetchedFromRemote in the user's client

let companyInfo = localStorage.getItem('companyInfo')
let parsedCompanyInfo = JSON.parse(companyInfo);

tofusoup429

let dataFetchedFromRemoteForCompanyInfo = {
     name:"ABC corp",
     address: "4090  Shady Pines Drive Independence VA",
     postalCode: 24348
}
let dataFetchedFromRemoteForUserInfo = {
     name:"ABC corp",
     title: "manager",
}
localStorage.setItem('companyInfo', JSON.stringify(dataFetchedFromRemoteForCompanyInfo))

tofusoup429

let dataFetchedFromRemoteForCompanyInfo = {
    name:"ABC corp",
    address: "4090  Shady Pines Drive Independence VA",
    postalCode: 24348
 }       
 let dataFetchedFromRemoteForUserInfo = {
    name:"ABC corp",
    title: "manager",
 }
 localStorage.setItem('companyInfo', JSON.stringify(dataFetchedFromRemoteForCompanyInfo))

tofusoup429

let DB_NAME = 'testIDB' // Name of database => one origin can have as many databases as it wants. 
let OBJECT_STORE_NAME = 'testObjectStore' // Name of object store. => one database can have as many object store as it wants. 

let request = indexedDB.open(DB_NAME, 1) // fire to open DB named 'testIDB' version 1. 

request.onupgradeneeded = (e) => {
  //when the database named 'testIDB' does not exist.
  //Or need to update to the latest version.(not discussing here)
  console.log(e);
}

tofusoup429

let DB_NAME = 'testIDB' // Name of database => one origin can have as many databases as it wants.
let OBJECT_STORE_NAME = 'testObjectStore' // Name of object store. => one database can have as many object store as it wants.

let request = indexedDB.open(DB_NAME, 1) // fire to open DB named 'testIDB' version 1.

request.onupgradeneeded = (e) => {
    let db = request.result;
    let objectStore = db.createObjectStore(OBJECT_STORE_NAME,{keyPath:"id"});
    console.info('database and object store created');
};

tofusoup429

const mutateDatabase = (_store, _data) => {
    return new Promise((res,rej)=> {
        let openRequest = indexedDB.open('testIDB', 1);
        openRequest.onsuccess = () => {
            let db = openRequest.result;
            let transaction = db.transaction(_store,'readwrite');
            let store = transaction.objectStore(_store)
            let request = store.put(_data);
                request.onerror = ()=> console.error('error', request.error)
                request.onsuccess = () => res({status:200, data:_data});

tofusoup429

const employeeSalaryMap = new Map();
employeeSalaryMap.set('Mike', 5000);
employeeSalaryMap.set('Sandy', 8000);
employeeSalaryMap.set('Clark', 9000);

let size = employeeSalaryMap.size;
console.log(size) //3 

tofusoup429

const employeeSalaryObject = {Mike:5000, Sandy:8000, Clark:9000}
const keyArray = Object.keys(employeeSalaryObject); // convert to keys-array
const size = keyArray.length;
console.log(size) //3

tofusoup429

const objectMaker = (_size)=>{
    //create an object with size of _size
    let obj = {}
    for(let i=0; i<_size; i++){
        obj[i.toString()] = i
    }
    return obj
}

const mapMaker = (_size)=>{