Explore topic-wise InterviewSolutions in .

Right choice is (d) require()

To elaborate: require() is used for including other javascript files. Use require() instead of LOAD(). It loads and EXECUTES (only once) the NAMED module, returning an OBJECT that contains its exported symbols.

Correct answer is (c) NODE PROGRAM.js

For EXPLANATION I would say: The node programs can be run with the COMMAND:node program.js. The command can be written more SIMPLY like node program.

Correct answer is (b) APIs are asynchronous

The best I can EXPLAIN: For handling the spontaneous events occurring on the web page the EVENT handlers are IMPORTANT. Because the APIs are asynchronous, Node RELIES on event handlers, which are often implemented using nested functions and closures.

The correct answer is (B) new

For explanation I would say: New is a KEYWORD in JavaScript which is used to DEFINE new models. New operator is used to create new instance of the CLASS.

The correct OPTION is (a) It becomes JavaScript PROPERTIES

The best I can explain: Rhino ALLOWS JavaScript code to QUERY and set the static fields of Java classes and the instance fields of Java objects. Java classes often avoid defining public fields in favor of getter and setter methods. When getter and setter methods exist, Rhino EXPOSES them as JavaScript properties.

Right option is (b) importClass(java.util.*);

Easy explanation: Because packages and CLASSES are represented as JavaScript objects, you can assign them to VARIABLES to GIVE them shorter names. But you can ALSO more FORMALLY import them, if you want to:

Right answer is (a) Starting an interactive shell

The explanation: Rhino is distributed as a JAR ARCHIVE. Start it with a command line like this :

java -jar rhino1_7R2/js.jar program.js

If you omit program.js, Rhino starts an interactive shell, which is USEFUL for TRYING out simple programs and one-liners.

The CORRECT option is (c) quit()

For explanation I WOULD SAY: quit() is a predefined command in RHINO. The quit() command makes Rhino exit.

Right CHOICE is (a) s.pause();

EXPLANATION: Data events are the events which are performed by either the USER or the BROWSER. The above CODE snippet is used to pause data events, for throttling uploads.

The CORRECT ANSWER is (a) SPAWN(f);

Easiest EXPLANATION: The spawn(f) runs f() or loads and executes file f in a new THREAD.

Right ANSWER is (b) s.on(“end”,F);

For EXPLANATION: ”EOF” STANDS for end of file.The above code SNIPPET gets “end” event fired on EOF when no more data will arrive.

The CORRECT option is (b) Mozilla

The explanation: Rhino is a JavaScript engine written FULLY in Java and managed by the Mozilla Foundation as open source software. Rhino is free software from Mozilla. You can download a copy from HTTP://www.mozilla.org/rhino/.

The correct option is (c) SIGINT

The explanation is: The SIGINT is a POSIX signal that GENERATES event. Simple code like below can do a proper clean up and exit on CTRL-C or SIGINT passed from command LINE / other application to the nodejs APP’s PROCESSID.

Right answer is (b) process

To explain: The process object is an event emitter. The NODE defines other important globals under the process namespaces that contain properties of that object LIKE version, argv, env, PID, getuid(), cwd(), chdir() and EXIT().

The correct answer is (d) removeAllListeners(NAME)

To explain I would SAY: The removeAllListeners(name) is USED to remove all handlers from name EVENTS REPRESENTED as :

emitter.removeAllListeners(name)

The correct choice is (a) addListener()

To elaborate: The on() METHOD is used for registering HANDLERS. addListener() is a SYNONYM for on().

Correct OPTION is (a) When HANDLERS are registered

For explanation I would SAY: The on() method and addListener() method PERFORM the same task of acting as an event emitter. The on() and addListener() method is used for registering handlers.

Correct choice is (B) EMITTERS

Best explanation: There are two classes of events ONE is called event listener and the other is called event emitter. Node OBJECTS that generate events (KNOWN as event emitters) define an on() method for registering handlers.

The correct answer is (C) removeListener(name,F)

BEST EXPLANATION: The removeEventListener() method removes an event handler that has been attached with the addEventListener() method. The removeListeners(name,f) is used to deregister event handler f REPRESENTED as :

emitter.removeListener(name,f)