Nodejs Set 3

1.

Which of the following codes returns and prints a JSON-rendering of the Buffer instance in Node.js?

var buf = new Buffer('Personal Studying'); var json = (buf); console.log(json); var buf = new Buffer('Personal Studying'); var json = buf.toJSON(buf); var buf = new Buffer('Personal Studying'); var json = buf.toJSON(buf); console.log(json); var buf = new Buffer('Personal Studying'); var json = buf.toJSON(buf);

2.

Which of the following methods is used to join Node buffers to form a single Node Buffer?

Buffer.concat(list[, totalLength]) concat(list[, totalLength]) Buffer(list[, totalLength]) BufferConcat(list[, totalLength])

3.

Which of the following methods is used to copy a node buffer in Node.js?

buf.copy(targetBuffer[, targetStart][, sourceStart][, sourceEnd]) copy(targetBuffer[, targetStart][, sourceStart][, sourceEnd]) array.copy(targetBuffer[, targetStart][, sourceStart][, sourceEnd]) buf.copybuffer(targetBuffer[, targetStart][, sourceStart][, sourceEnd])

4.

Which of the following methods is used to get the size of a node.js buffer in bytes?

buf.size; buf.array; length; buf.length;

5.

In node.js, which of the following codes is used to create a buffer and return its size in bytes?

var buffer = new Buffer('Youtube'); console("buffer length: " + buffer.length); var buffer = new Buffer('Youtube'); console.log("buffer length: " + buffer.length); var buffer = Buffer('Youtube'); console.log("buffer length: " + buffer.length); var buffer = new Buffer('Youtube'); log("buffer length: " + buffer.length);

6.

In node.js, which of the following methods is used to display the sub-buffer of a node buffer?

buf([start][, end]) slice([start][, end]) buf.new slice([start][, end]) buf.slice([start][, end])

7.

Which of the following node.js codes is used to create a file named output.txt ?

var fs = require("fs"); var data = 'Simply Easy Learning'; writerStream.end(); writerStream.on('finish', function() { console.log("Write completed."); }); writerStream.on('error', function(err){ console.log(err.stack); }); console.log("Program Ended");

var fs = require("fs"); var data = 'Simply Easy Learning'; var writerStream = fs.createWriteStream('output.txt'); writerStream.write(data,'UTF8'); // Mark the end of file writerStream.end(); // Handle stream events --> finish, and error writerStream.on('finish', function() { console.log("Write completed."); }); writerStream.on('error', function(err){ console.log(err.stack); }); console.log("Program Ended");

None of these

8.

In a current directory in node.js, a file named input.txt is zipped and changed to a file named input.txt.gz.
Which of the following codes is used to detect this file and unzip it?

var fs = require("fs"); var zlib = require('zlib'); fs.createReadStream('input.txt.gz') .pipe(zlib.createGunzip()) console.log("File Decompressed."); var fs = require("fs"); fs.createReadStream('input.txt.gz') .pipe(zlib.createGunzip()) console.log("File Decompressed."); var fs = require("fs"); var zlib = require('zlib'); fs.createReadStream('input.txt.gz') .pipe(zlib.createGunzip()) .pipe(fs.createWriteStream('input.txt')); console.log("File Decompressed."); None of these

9.

Which of the following functions is used to get information about a file in node.js?

open.stater(path, callback) fs.stat(path, callback) start.stat array(path, callback) None of these

10.

Which of the following is a valid method syntax to open a file in asynchronous mode in node.js?

fs.open(path, flags[, mode], callback) fs.(path, flags[, mode], callback) open(path, flags[, mode], callback) fs.open close(path, flags[, mode], callback)

Nodejs Set 3

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Congratulations

COMPANY

Products

OTHERS

Partner

Nodejs Set 3

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Answer & Solution

Answer: Option B

Solution:

Congratulations

Detail Form

COMPANY

Products

OTHERS

Partner