Last active
August 29, 2015 14:09
-
-
Save darrenderidder/a4ccbd463146a254b22b to your computer and use it in GitHub Desktop.
I (heart)Callbacks
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function greet(user, cb) { | |
users.findOne(user.name, function (err, result) { | |
if (err) { | |
cb(err); | |
} else { | |
var fullname = result.fullname; | |
var email = result.email; | |
var language = result.language; | |
greetings.findOne(language, function (err, result) { | |
if (err) { | |
cb(err); | |
} else { | |
var body = result + fullname; | |
nodemailer.send(email, body, function (err, result) { | |
if (err) { | |
cb(err); | |
} else { | |
cb(null, "Greeted " + fullname + " in " + language); | |
} | |
}); | |
} | |
}); | |
} | |
}); | |
} |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function greet(user, cb) { | |
users.findOne(user.name, getGreeting); | |
function getGreeting (err, result) { | |
if (err) { | |
cb(err); | |
} else { | |
var fullname = result.fullname; | |
var email = result.email; | |
var language = result.language; | |
greetings.findOne(language, sendGreeting); | |
} | |
function sendGreeting (err, result) { | |
if (err) { | |
cb(err); | |
} else { | |
var body = result + fullname; | |
nodemailer.send(email, body, showResult); | |
} | |
} | |
function showResult(err, result) { | |
if (err) { | |
cb(err); | |
} else { | |
cb(null, "Greeted " + fullname + " in " + language); | |
} | |
} | |
} | |
} |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function greet(user, cb) { | |
// Putting shared variables in the outer scope | |
var fullname = null; | |
var email = null; | |
var language = null; | |
users.findOne(user.name, getGreeting); | |
function getGreeting (err, result) { | |
if (err) { | |
cb(err); | |
} else { | |
fullname = result.fullname; | |
email = result.email; | |
language = result.language; | |
greetings.findOne(language, sendGreeting); | |
} | |
} | |
function sendGreeting (err, result) { | |
if (err) { | |
cb(err); | |
} else { | |
var body = result + fullname; | |
nodemailer.send(email, body, showResult); | |
} | |
} | |
function showResult(err, result) { | |
if (err) { | |
cb(err); | |
} else { | |
cb(null, "Greeted " + fullname + " in " + language); | |
} | |
} | |
} |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
function greet(user, cb) { | |
var fullname = null; | |
var email = null; | |
var language = null; | |
users.findOne(user.name, getGreeting); | |
function getGreeting (err, result) { | |
if (err) { | |
return cb(err); | |
} | |
fullname = result.fullname; | |
email = result.email; | |
language = result.language; | |
greetings.findOne(language, sendGreeting); | |
} | |
function sendGreeting (err, result) { | |
if (err) { | |
return cb(err); | |
} | |
var body = result + fullname; | |
nodemailer.send(email, body, showResult); | |
} | |
function showResult(err, result) { | |
if (err) { | |
return cb(err); | |
} | |
cb(null, "Greeted " + fullname + " in " + language); | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment