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What’s new in JavaScript/Node in 2021 | ECMAScript 2021

JavaScript in 2021 provide some new features and flexibility to make JS developer life easy. let’s start — 1. Promise.any Syntax: Promise.any([p1, p2, p3]) Promise.any() is opposite of Promise.all(), it get resolved if any of Single promise get resolved. Example- Promise.any get resolved as any of promise get resolved , here promise…

Ecmascript2021

3 min read

Ecmascript2021

3 min read

Mar 2, 2022

Nest JS — Managing multiple connection solved— Master, Slave easily | Working solution | 2022 solution

In NEST JS You can setup read/write replication using TypeORM. Now when u perform any write operation using repository it will use master config and read will use random slave config Example —

Nestjs

1 min read

Nestjs

1 min read

Jul 25, 2021

Polyfill of Promise.all()

This question is asked in many JavaScript, Node, Angular, React.. interviews Why use Promise.all ? Promise.all is actually a promise that takes an array of promises as an input (an iterable). Then it gets resolved when all the promises get resolved or any one of them gets rejected. Promise.all([Promise1, Promise2, Promise3]) .then(result) => { console.log(result) }) .catch(error => console.log(`Error in promises ${error}`))

JavaScript

1 min read

JavaScript

1 min read

Aug 29, 2020

Easily print Pdf link in Javascript/Angular (Solved)

We are going to use print.js library: https://printjs.crabbly.com/ 1. For Html/Javascript Project a) in HTML file define these links <link rel="stylesheet" type="text/css" href="https://printjs-4de6.kxcdn.com/print.min.css"> <script src="https://printjs-4de6.kxcdn.com/print.min.js"> </script> b) Now global method printjs is available printJS({printable:'https://vadimdez.github.io/ng2-pdf-viewer/assets/pdf-test.pdf', type:'pdf', showModal:true})

Pdf Preview

1 min read

Pdf Preview

1 min read

May 10, 2020

Design Patterns in Javascript /Node — 2020

In this article, we are going to talk about design patterns that can be and should be used to write better, maintainable JavaScript code A design pattern provides a general reusable solution for the common problems occurs in software design. The underlying concept of design patterns has been around in…

Js Design Patterns

8 min read

Design Patterns in Javascript /Node — 2020

Js Design Patterns

8 min read

May 9, 2020

AWS Systems Manager (SSM) Parameters Store and Access using Lambda Function (Node/Javascript)

What is AWS SSM: AWS Systems Manager Parameter Store provides secure, hierarchical storage for configuration data management and secrets management. You can store data such as passwords, database strings and license codes as parameter values. You can store values as plain text or encrypted data Some use cases — a…

AWS Lambda

3 min read

AWS Systems Manager (SSM) Parameters Store and Access using Lambda(Node/Javascript)

AWS Lambda

3 min read

Mar 17, 2020

How to load ‘n’ number of images in HTML one by one using Javascript?

Suppose there are 100 of images and you want to render them one by one in HTML. <html> <body> <div id="container"> </div> <script> const images = ['https://fakeimg.pl/300/', 'https://media.geeksforgeeks.org/wp-content/uploads/20190529122828/bs21.png', 'https://fakeimg.pl/400/', 'https://fakeimg.pl/100/']; const loadImages = (images) => { images.forEach((image) => { const img = document.createElement('img');

Lazy Load Images

1 min read

How to load a number of images in HTML one by one using Javascript?

Lazy Load Images

1 min read

Dec 14, 2019

Javascript this? Understand in simple language

Many javascript developers either newbie or experienced developer confused with this. You will find all about this keyword in easy language What is this? In our natural language, we use this to refer to current Environment Objects: If a person sitting inside the house says: this address so it means…

JavaScript

4 min read

JavaScript

4 min read

Nov 19, 2019

Convert local URL(URL) to Base64 in javascript

Use XMLHttpRequest() set responseType to Blob , use FileReader() at XMLHttpRequest onload event to read response as data URI var xhr = new XMLHttpRequest(); xhr.open("GET", "/path/to/local/image/file", true); xhr.responseType = "blob"; xhr.onload = function (e) { console.log(this.response); var reader = new FileReader(); reader.onload = function(event) { var res = event.target.result; console.log(res) } var file = this.response; reader.readAsDataURL(file) }; xhr.send()

JavaScript

1 min read

JavaScript

1 min read

Nov 7, 2019

Setup Node.js Server and Environment variables in windows/Linux Easily

Many times I notice setting an environment variable in Windows/Linux not work quickly so there is a package manager tool pm2 use for managing env variables and setup server PM2 is a production process manager for Node.js applications with a built-in load balancer. It allows you to keep applications alive…

Nodejs

2 min read

Nodejs

2 min read