devarajchidambaram

var Minio = require('minio')

// Instantiate the minio client with the endpoint
// and access keys as shown below.
var minioClient = new Minio.Client({
    endPoint: 'localhost',
    port: 9000,
    useSSL: false,
    accessKey: '0OPKIKKR058HTBYXV2JA',
    secretKey: 'oT7jT9a0u5UTWoNW5nU+wMdE3lfRtwL5B0FZVRVu'

devarajchidambaram

import React,{Component} from 'react'
import logo from './logo.svg';
import Contact from './Contacts'
class App extends React.Component {
  
  //Pass the callback in the props 
constructor(props){
  super(props)
  this.state = {
    contacts : [

devarajchidambaram

import React,{Component} from 'react'
import logo from './logo.svg';
import Contact from './Contacts'
class App extends React.Component {
  
  //Pass the callback in the props 
constructor(props){
  super(props)
  this.state = {
    contacts : [

devarajchidambaram

Following four HTTP methods are commonly used in REST.
• GET - This is to provide a read-only access to resource.
• PUT - This is to create a new resource
• DELETE - This is to remove a resource
• POST - This is to update a existing resource or create a new resource.

When we try to use PUT and DELETE in HTML, we have a problem. Browsers do support PUT and DELETE but it only by using request via AJAX, but not via 'HTML form' submission.

https://dev.to/moz5691/method-override-for-put-and-delete-in-html-3fp2

devarajchidambaram

async function timerTask(){

    let [data1, data2]  =  await Promise.all([
        new Promise(function(resolve , reject){
            setTimeout(()=>{
                 resolve('data1!')
            }, 1000)

devarajchidambaram

let date = new Date()
date.toLocaleString('default', { month: 'short' }) //narrow , long short available

devarajchidambaram

200- OK; Standard response for successful HTTP requests
201- Created; Request has been fulfilled. New resource created
204- No Content; Request processed. No content returned
301- Moved Permanently; This and all future requests directed to the given URI
304- Not Modified; Resource has not been modified since last requested
400- Bad Request; Request cannot be fulfilled due to bad syntax
401- Unauthorized; Authentication is possible, but has failed
403- Forbidden; Server refuses to respond to request
404- Not Found; Requested resource could not be found
500- Internal Server Error; Generic error message when server fails

devarajchidambaram

var evens = [2,4,6,8,10];

var odds = evens.map(v=>v+1)

var pairs = evens.map(value => ({even : value , odd :value+1}))

console.log('odds', pairs)

//This works differntly in arrow function
var object = {

devarajchidambaram

const myObject = {
   "a":"a",
   "b":{
      "c":"c",
      "d":{
         "e":"e",
         "f":{
            "g":"g",
            "h":{
               "i":"i"

devarajchidambaram

Common Node.js deployment problems
Problems occurring in Node.js application deployments can have a range of symptoms, but can generally be categorized into the following:

Uncaught exception or error event in JavaScript code
Excessive memory usage, which may result in an out-of-memory error
Unresponsive application, possibly looping or hanging
Poor performance
Crash or abort in native code
Unexpected application behavior or functional issue