UpWork (oDesk) & Elance Node.js Test Question & Answers
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Ques : What do the lines like symbols = symbols || SYMBOLS_DEFAULT; do?
Ans : This is a JS idiom for setting default arguments.Ques : What do the lines like symbols = symbols || SYMBOLS_DEFAULT; do?
Ques : True or False: node.js can call other command line scripts.
Ans : True
Ques : The "js" in Node.js stands for?
Ans : javascript
Ques : Why is Node.js important?
Ans : It allows asynchronous processing in the background without interupting the user
Ques : Why is Node.js important?
Ans : It allows asynchronous processing in the background without interupting the user
Ques : To exit out of a function you should use _____?
Ans : return;
Ques : The process object is an instance of what class?
Ans : EventEmitter
Ques : To create an instance of the HTTP object, which function is used?
Ans : require
Ques :True or false? Node.js is multi-core by nature.
Ans : False
Ques : The process object is an instance of____?
Ans : EventEmitter
Ques : To parse a URL string use____?
Ans : querystring
Ques : The Javascript used in node.js:
Ans : Is on-par with a recent version of Chrome
Ques : What program is used to programmtically control the browser?
Ans : javascript
Ques : Which of the following is a standard node module, included with the default install?
Ans : fs
Ques : Running the following code, what will the console output? var http = require('http'); http.createServer( function (request, response) { response.writeHead(200, {'Content-Type': 'text/plain'}); response.end('Hello World\n'); } ).listen(8000); console.log('Server running at http://localhost:8000/');
Ans : Server running at http://localhost:8000/
Ques : A module is an____?
Ans : Object
Ques : How do you call a function attached to an object that will be executed when the object emits an event?
Ans : Listener
Ques : Node.js is stored on your____?
Ans : hard drive
Ques : What is node.js based on?
Ans : Chrome's JavaScript runtime
Ques : What is a Buffer?
Ans : Raw memory allocated outside the v8 heap
Ques : WebSockets with Socket.io can be used to?
Ans : All of these.
Ques : How do you require a module?
Ans : var module = require('mymodule')
Ques : Which is a comment in node?
Ans : //comment
Ques : Which of the following can be created and managed using node.js?
Ans : All of these
Ques : REPL is:
Ans : Read-Eval-Print-Loop, a way to interactively run code
Ques : To declare a variable use what keyword?
Ans : var
Ques : NPM is a...
Ans : Package manager
Ques : How do you output to console in node.js?
Ans : util.log or console.log
Ques : What function is used to write out application errors/events?
Ans : console.log
Ques : Which is of the following is a potential advantage of using Node.js?
Ans : All of these.
Ques : In node.js you can write and run code in what language?
Ans : Javascript
Ques : What Javascript Engine does node.js use?
Ans : V8
Ques : Use _____ to step through your code.
Ans : breakpoints
Ques : If you have a node program called example.js, how would that be excuted?
Ans : node example.js
Ques : A popular web application for framework for node?
Ans : express
Ques :In this code: function myLog(err, data) { console.log(err, data); } fs.readFile('/tmp/sample', myLog); The function 'myLog' is used as a(an):
Ans : Callback
Ques : node.js excels at dealing with:
Ans : I/O-bound tasks
Ques : What does Node.js run on?
Ans : server
Ques : How does one get access to Node.js?
Ans : download the install
Ques : What is REPL?
Ans : Read-Eval-Print-Loop
Ques : The Cryptography module requires OpenSSL.
Ans : True
Ques : How can I call an object function from my module if my module name is "iModule"?
Ans : require('iModule').mObject();
Ques : Where does Node run on your machine?
Ans : as an application
Ques : If you have a problem with your code, where would you look?
Ans : console.log
Ques : What interface is used to access folders on your local drive
Ans : fs
Ques : What interface is used to create a server through Node.js
Ans : http
Ques : What is the code to access the DNS module?
Ans : require('dns');
Ques : Which npm command will load all dependencies in the local node_modules folder?
Ans : npm install
Ques : How do you cause a function to be invoked at a specified time later?
Ans : setTimeout(fn, 1000)
Ques : What does the Zlib module provide?
Ans : setTimeout(fn, 1000)
Ques : What does the Zlib module provide?
Ans : Bindings to Gzip/Gunzip, Deflate/Inflate, and DeflateRaw/InflateRaw classes
Ques : What does the require call return?
Ans : module.exports object
Ques : What method is used to parse JSON using NodeJS?
Ans : JSON.parse();
Ques : What is node.js?
Ans : A program written in C
Ques : In the following Express route stack, which handler will be called for "GET /item/23"? app.get("/", routes.index ); app.get("/item", routes.item ); app.get("/item/:id", routes.id ); app.post("/item/:id", routes.post );
Ans : routes.id
Ques : Which of these is a built-in module that can be used for unit testing in Node.js?
Ans : Assert
Ques : How do you start the node.js REPL?
Ans : node
Ques : True or False: node.js runs in a single thread.
Ans : True
Ques : Which function allows you to chain event listeners?
Ans : on()
Ques : The interactive shell is also called_____?
Ans : REPL
Ques : What syntax is correct for reading environment variable?
Ans : process.env.ENV_VARIABLE
Ques : Timer functions are built into node.js, you do not need to require() this module in order to use them.
Ans : true
Ques : Which of these statements about Express is true?
Ans : Express is an NPM module.
Ques : Which company manages and maintains node.js?
Ans : Joyent
Ques : Given the following route and request, which Request object property will hold the value of 30 in the Express handler? Route: "/post/:id" Request: "/post/30?start=20"
Ans : req.params.id
Ques : net.Server emits an event every time a ____ connects to the server.
Ans : peer
Ques : By executing node without any arguments from the command-line:
Ans : you will be dropped into the REPL
Ques : Which of these are valid ways to apply middleware in Express?
Ans : All of these.
Ques : What built in class is a global type for dealing with binary data directly?
Ans : Buffer
Ques : What is typically the first parameter in node.js callback functions?
Ans : Error
Ques : Node will run until its sure that no further ___ are available.
Ans : Events-handlers
Ques : If an error occures in an Express middleware function, what is the best way to pass the error object to the subsequent handlers?
Ans : function( req, res, next){ ... next( err ); }
Ques : The VM module allows one to:
Ans : Run JavaScript code in a sandbox environment
Ques : The first argument passed to a Node.js asynchronous callback is always what?
Ans : An Error object if an error has occured.
Ques : In Express, which of these paths would NOT be cosumed by the following route? "/users/:id/:action?"
Ans : "/users"
Ques : Express middleware is actually handled by what other Node.js module?
Ans : Connect
Ques : Node.js is a truly parallel technology.
Ans : False
Ques : Which of these Express middleware stacks will NOT log favicon requests?
Ans : app.use(express.favicon()); app.use(express.logger()); app.use(express.static(__dirname + '/public'));
Ques : In Express, which of these Response methods can NOT automatically end the response?
Ans : res.type()
Ques : Given the following route and request, which Request object property will hold the value of 20 in the Express handler? Route: "/post/:id" Request: "/post/30?start=20"
Ans : req.query.start
Ques : var http_server = require('http'); how can you create a server?
Ans : http_server.createServer(function(){});
Ques : Node.js clusters are child processes that do NOT share server ports?
Ans : false
Ques : Which of these is definitely true of Node.js?
Ans : Node.js can be used to create command line tools.
Ques : What command is used to end a Node.JS process?
Ans : .exit
Ques : Which of these are required fields in your package.json file?
Ans : "name" and "version"
Ques : What is the name of the module system used in node.js?
Ans : CommonJS
Ques : In Node.js, the result of an asynchronous function can be accessed how?
Ans : By the value passed as the second argument of the callback.
Ques : What is NOT a valid method to create a child process instance?
Ans : popen(3)
Ques : In Express, which of these would NOT expose the variable "title" to the template renderer?
Ans : res.render.title = "My App";
Ques : Which Express middleware must come before express.session() in your stack?
Ans : express.cookieParser()
Ques : If an EventEmitter object emits an 'error' event and there is no listener for it, node will:
Ans : Print a stack trace and exit
Ques : The http.ServerResponse is an example of a what?
Ans : A writable Stream.
Ques : Which of these is NOT a global object?
Ans : Stream
Ques : Which of the following is not a global object in node.js?
Ans : path
Ques : Which of these is a valid way to output the contents of a file?
Ans : console.log( fs.readFileSync("file.txt") );
Ques : What is the default memory limit on a node process?
Ans : 512mb on 32-bit systems, and 1gb on 64-bit systems.
Ques : If the Connect node package module is updated from version 2.8.5 to version 3.1.0 which dependency in your package.json file may break your application on update?
Ans : "connect": ">=2.5"
Ques : How do you create a new client connection via SSL?
Ans : tls.connect()
Ques : In the following Express routing method, what is the maximum number of arguments that may be passed to the callback function "routeHandler"? app.all("*", routeHandler )
Ans : 4
Ques : Is it possible to execute node.js system command synchronously?
Ans : Yes, with a third party library
Ques : When creating a command line tool with Node.js, which expresion will allow you access the first command line argument?
Ans : process.argv[2]
Ques : Which of the following is NOT true about Node 0.6?
Ans : Unix binary distributed
Ques : Which of these is not a valid version according to npm semantic versioning?
Ans : "1.2.3b"
Ques : Which is a correct way to check the latest released version of the Express module with npm?
Ans : npm view express version
Ques : A Buffer can be resized
Ans : False
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