I wrote short article http://jslang.info/blog/2014/escape-from-callback-hell
about simple approach that turn this
var printCommentsForUser = function(login, password, cb){
authenticateUser(login, password, function(err, user){
if(err) return cb(err)
getComments(user.id, function(err, comments){
if(err) return cb(err)
renderComments(user, comments, cb)
})
})
}
Into this
var printCommentsForUserWithFork = function(login, password, ecb, cb){
authenticateUser(login, password, ecb, function(user){
getComments(user.id, ecb, function(comments){
renderComments(user, comments, ecb, cb)
})
})
}
Or this
var printCommentsForUserWithTwoCallbacks = function(login, password,
ecb, cb){
authenticateUser(login, password, ecb, function(user){
getComments(user.id, ecb, function(comments){
renderComments(user, comments, ecb, cb)
})
})
}
On Monday, 15 September 2014 20:28:28 UTC+4, Ingwie Phoenix wrote:
>
> Hai, everyone.
>
> So I just figured out that Connect’s static file servers dont work well
> with symlinks…so I had tow rite myself a little workaround, a fallback
> router, per-se. But whilst I did so, I had a nice meeting with the callback
> hell. Here’s my code:
>
> CDN.use(config.CDN.baseUrl, function(req, res, next){
> if(err) { next(); throw err; }
> fs.lstat(config.base+"/cdn"+req.url, function(err,stats){
> if(stats.isSymbolicLink()) {
> fs.readlink(config.base+"/cdn"+req.url,
> function(err, linkstr){
> if(err) throw err;
> log.info("Redirecting request \""+req.url+"\"
> to \""+linkstr);
> fs.readFile(linkstr, function(err, data){
> if(err) throw err;
>
> res.writeHead(200,{"Content-type":"text/html"});
> res.end(data);
> });
> });
> }
> });
> });
> });
>
> Okay…thats lots. And how does one get around this and into a bit of nicer
> code? It almost looks like a little pyramid there…
>
> Kind regards, Ingwie.
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