Using Callback and creating a Callback Hell situation to understand the drawbacks.

PHOTO

Tue Apr 22 2025 18:26:44 GMT+0000 (Coordinated Universal Time)

Saved by @fsd

function mul(num,callback){
    callback(num*2);
}

function sub(num,callback){
   callback(num-3);
}

function add(num,callback){
   callback(num+10);
}

mul(2,(res)=>{
   sub(res,(sres)=>{
       add(sres,(ares)=>{
      console.log(ares) })
   })
})

Save snippets that work from anywhere online with our extensions

Available in the Chrome Web Store

Get Firefox Add-on

Get VS Code extension

Comments

More like this

fsd

@fsd

Working with Object and Array Destructuring. Working with Modules. Working with Function Generators and Symbols. Working with Closure. . Working with higher order function in JavaScript. Using Callback and creating a Callback Hell situation to understand the drawbacks. Working with XHR: response. . Dealing with the Callback Hell situation using Promise. Exploring the different ways of ealing with the Callback Hell situation using Promise. Exploring the different ways of creating and using promise in executing the asynchronous task. Dealing with Promise chaining and async / await. Use fetch function to access remote data using the given api and display the data in the form of a table. Use fetch function to read the weather details from openweathermap.org and display the details like city, min-temp, max-temp, humidity on the webpage for a given city Create custom / local modules and export them using various module patterns. Explore the functionality of os, path, util and events modules. Use the fs module for creating directories and files of different formats Write script to read and write the streaming data using readable and writable streams. Create a http server listening request at port 3000. Process the request to provide different type of resources as response. (HTML, TEXT, JSON, etc.). Create a http server listening request at port 3000. Process the request to provide different type of resources as response. (HTML, TEXT, JSON, etc.). Create a custom API for Users data and add different endpoints in express server to perform CRUD operations on the API. Test the endpoints using POSTMAN. Create express server that has endpoints connecting to Users collection present in Mongo DB database using mongoose library and perform CRUD operation on that. Create express server that has authorized endpoint using JWT (JSON Web Token) library

Browse more snippets >>