javascript - Nodeschool's Stream-Adventure #12 Duplexer redux -

-

it's been days since i'm trying several ways solve exercice. give up. doing wrong here ? why getting "write after end" error if event i'm using "end" event , don't write pipe ? i'm changing object after it's use. or @ least think so.

var duplexer2 = require("duplexer2"); var through = require('through2');   module.exports = function (counter) {     var countries = {};              var duplex = duplexer2(through.obj(function (obj, encoding, done) {         if (obj.country in countries)             countries[obj.country]++;         else              countries[obj.country] = 1;           done();     }), counter);      duplex.on("finish", function() {         counter.setcounts(countries);     });      counter.pipe(duplex);      return duplex; };

if substitute line counter.setcounts(countries); console.log(countries) see it's populated correctly.

problem text: http://pastebin.com/vam4vkzg

i have read exercice test file , counldn't clue compares objects see if they're correct.

your solution correct. remove counter.pipe(duplex); line , works. not need pipe duplex stream created, stream adventure going check if works :).


Comments

Post a Comment

Popular posts from this blog

node.js - Mongoose: Cast to ObjectId failed for value on newly created object after setting the value -

-
this question has answer here: what's mongoose error cast objectid failed value xxx @ path “_id”? 7 answers even though has been asked many times because entity has no valid objectid field. i came across situation objectid set value can casted objectid still error. the schema: var serviceschema = parammongoose.schema({ servicename:{ type: parammongoose.schema.types.objectid , ref: 'servicenames',required:true } }); pseudo code: servicefromdb=new service({servicename:'some name'}); servicefromdb.servicename='000000000000000000000001'; servicefromdb.save(function(paramerror,paramdata){ if(paramerror){ console.log('but but...',servicefromdb,paramerror) } }); the output of code is: but but... { servicename: 000000000000000000000001, _id: 55079a90286f49280364f78b } { [casterror: cast objectid faile...
Read more

gradle error "Cannot convert the provided notation to a File or URI" -

-
i have defined 2 system properties in gradle.properties: systemprop.builddir=build systemprop.cfgdir=build\\cfg and have following task defined in build.gradle: task clean(group:'clean',description:'clean project') << { ant.sequential { delete(dir: system.properties.builddir) mkdir(dir: system.properties.builddir) delete(dir: system.properties.cfgdir) mkdir(dir: system.properties.cfgdir) } } this generates following error: execution failed task ':clean'. > cannot convert provided notation file or uri: {dir=build}. following types/formats supported: - string or charsequence path, e.g 'src/main/java' or '/usr/include' - string or charsequence uri, e.g 'file:/usr/include' - file instance. - uri or url instance. but equivalent block of code not generate error , works expected: task clean(group:'clean',description:'clean project') << { ...
Read more

python - NameError: name 'subprocess' is not defined -

-
i'm trying make rng website: http://jamesdotcom.com/?p=417 . when run following code: captureimage = subprocess.popen( [ "fswebcam", "-r", "356x292", "-d", "/dev/video0", "static.jpg", "--skip", "10" ], stdout=devnull, stderr=devnull) captureimage.communicate() i following error message: nameerror: name 'subprocess' not defined what should do? thanks have imported first? import subprocess captureimage = subprocess.popen(["fswebcam", ...) subprocess included in python standard library since python 2.4. should not necessary install it.
Read more