What is callback hell in Node.js?

Asked by Last Modified  

2 Answers

Learn Java Script Training

Follow 1
Answer

Please enter your answer

Guru

When there is so much callbacks nested within one another, it causes callback hell.
Comments
Dislike Bookmark

IT Professional Trainer with 15 years of experience in IT Industry

When you are using the function inside a function and it really looks like hell, it considered as callback hell. doSomething(param1, param2, function(err, paramx){ doMore(paramx, function(err, result){ insertRow(result, function(err){ yetAnotherOperation(someparameter, function(s){ somethingElse(function(x){ }); }); }); }); }); There...
read more
When you are using the function inside a function and it really looks like hell, it considered as callback hell. doSomething(param1, param2, function(err, paramx){ doMore(paramx, function(err, result){ insertRow(result, function(err){ yetAnotherOperation(someparameter, function(s){ somethingElse(function(x){ }); }); }); }); }); There are multiple techniques for dealing with callback hell. Using Async.js Using Promises read less
Comments
Dislike Bookmark

Related Questions

Which skills do i require to be an better ui developer?
Mainly HTML, CSS, JavaScript and Advance need Javascript Framework like AngularJS, Angular, Ember JS, React JS and so and so.
Soumya Ranjan
Some basic program bass of java and how it work?
JavaScript (Lightweight & loosely typed client-side Scripting Language which needs interpreter) is entirely different from Java (Programming Language which needs compilation)
Shekhar
Want to learn javascript jquery and angular with live demo
Yes you can join me, i will provide you teaching with real life example,
Sandeep
0 0
7
How Java is different from Java script?
Java is server side language is used to make application. Java is need to compile. The end user can not see the code of java it is secured. But Javascript is script language is a open source can be viewed by end user in browser.
Samadhan
What is an Array?
An array is a collection of (same or different type of) items.In Java and C#, etc., the elements inside the array should be of the same type (e.g. ) while in languages like JavaScript and Python. The elements can be different types also(e.g. )
M

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons

Closures in Javascript
A closure is the combination of a function and the lexical environment within which that function was declared. Consider the following example: function makeFunc() { var name = 'Mozilla'; function...

Ranjan P.

0 0
0
Javascript basic Interview Questions
Check below logical operators var a = false && 'Cat'; false var b = 'Cat' && 'Dog'; dog var c = 'Cat' || 'Dog'; cat var d = !true; false var e = !false; false what are...

Malyala Srinivas

1 0
0
Some good resources
Clean Code by Robert C Martin, is available in my profile please download and read it, irrespective of what language you code in, it will change the way you code. Also if you code in Javascript read https://12factor.net/ https://blog.risingstack.com/javascript-clean-coding-best-practices-node-js-at-scale/ For...

Siddharth Roychoudhury

1 0
0
Bootstrap grid system
What is a Grid? As put by wikepedia − In graphic design, a grid is a structure (usually two-dimensional) made up of a series of intersecting straight (vertical, horizontal) lines used to structure...

Dheeraj Kushwaha

0 0
0
JavaScript Arrow Function
Javascript Arrow Functions : JavaScript ES6 is a type or version which let us provide a way to write javascript syntax in a better way. ES6 version is having a feature or new method to use functions...
A

Abhay

0 1
0

Recommended Articles

Top 6 Skills Required to Become a Web Designer

Here are the top 6 must have skills for every Web Designer : Technical Skills Web designers undoubtedly require very strong technical skills. They must have hands on using Web designing software and tools, such as Adobe Dreamweaver, Fireworks, Photoshop, Flash etc. In addition to the knowledge of design...

Read full article >

What is Applications Engineering all about?

Applications engineering is a hot trend in the current IT market.  An applications engineer is responsible for designing and application of technology products relating to various aspects of computing. To accomplish this, he/she has to work collaboratively with the company’s manufacturing, marketing, sales, and customer...

Read full article >

Make a Career in Mobile Application Programming

Almost all of us, inside the pocket, bag or on the table have a mobile phone, out of which 90% of us have a smartphone. The technology is advancing rapidly. When it comes to mobile phones, people today want much more than just making phone calls and playing games on the go. People now want instant access to all their business...

Read full article >

8 Hottest IT Careers of 2014!

Whether it was the Internet Era of 90s or the Big Data Era of today, Information Technology (IT) has given birth to several lucrative career options for many. Though there will not be a “significant" increase in demand for IT professionals in 2014 as compared to 2013, a “steady” demand for IT professionals is rest assured...

Read full article >

Find Java Script Training classes near you
Java Script Training classes in Bangalore
Java Script Training classes in Hyderabad
Java Script Training classes in Pune
Java Script Training classes in Mumbai
Java Script Training classes in Chennai
Java Script Training classes in Delhi
Java Script Training classes in Kolkata
Java Script Training classes in Gurgaon
Java Script Training classes in Noida
Java Script Training classes in Jaipur

Looking for Java Script Training classes?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you