Avoiding Callback Hell in JavaScript

Kao YWC#9

What is a callback function?

What is a callback function?

What is callback hell?

LinearFunction1

Function2

….

Function9

DependenciesFunction1

Function2 Function2

…

Function9

… … …

Function9 Function9 Function9

How to avoid callback hell?

Modularize

async.waterfall

LinearFunction1

Function2

….

Function9

async.auto

get_data

email_link

make_folder

write_file

get_data

email_link

make_folder

write_file

get_data

email_link

make_folder

write_file

get_data

email_link

make_folder

write_file

get_data

email_link

make_folder

write_file

async.each async.series async.parallel async.map async.filter async.every async.queue …. more than 60 functions

Promise

Generators