Class 8

Callback hell is when you try to execute multiple asynchronous operations one after the other. The way to avoid it is by using promises

Dummy objects for testing

Streams are a way to handle reading/writing files, network communications, or any kind of end-to-end information exchange in an efficient way.

Chaining async functions, can be in parallel or serial

The console module provides a simple debugging console that is similar to the JavaScript console mechanism provided by web browsers.

process.exit(1): Uncaught Fatal Exception,

process.exit(5): Fatal error

A Clustered index is a type of index in which table records are physically reordered to match the index. A Non-Clustered index is a type of index in which logical order of index does not match physical stored order of the rows on disk.

The 4 types of user-defined functions are:

-Function with no arguments and no return value

-Function with no arguments and a return value

-Function with arguments and no return value

-Function with arguments and a return value




Love podcasts or audiobooks? Learn on the go with our new app.

Recommended from Medium

Scaffolding a project using lerna and lerna-changelog

How to use React’s new Context API to easily manage modals

How to Upload Large Files in Laravel Web Application?

Building Chrome extension using React.js, Redux and Gulp automation

Mithril — Getting Started

Creating Accordion in Vanilla JS

10 Really Useful VSCode Extensions for Frontend Developers in 2022

10 Awesome GitHub Repos For Frontend Developer

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store
Ryan Pearson

Ryan Pearson

More from Medium

Who exactly are you?

What is Object Oriented Programing?

Small Town Girl

your majesty’s a pretty nice girl