Node

Question 1

What is Node.js?

Answer 1

As an asynchronous event-driven JavaScript runtime, Node.js is designed to build scalable network applications. In the following “hello world” example, many connections can be handled concurrently. Upon each connection, the callback is fired, but if there is no work to be done, Node.js will sleep.

Question 2

What can Node.js be used for?

Answer 2

As an asynchronous event-driven JavaScript runtime, Node.js is designed to build scalable network applications. In the following “hello world” example, many connections can be handled concurrently. Upon each connection, the callback is fired, but if there is no work to be done, Node.js will sleep.

Question 3

What is a REPL?

Answer 3

1

Question 4

When was Node.js created?

Answer 4

1

Question 5

What back end languages have you heard of?

Answer 5

1

Question 6

What is a computer process?

Answer 6

a process is the instance of a computer program that is being executed by one or many threads

Question 7

Roughly how many computer processes are running on your host operating system (Task Manager or Activity Monitor)?

Answer 7

300+

Question 8

What is the process object in a Node.js program?

Answer 8

The process object is the global object in Node. It can be accessed from anywhere; it is an instance of EventEmitter. Each Node. js has a set of built-in functionality, accessible through the global process objec

Question 9

How do you access the process object in a Node.js program?

Answer 9

console.log(process)

Question 10

What is the data type of process.argv in Node.js?

Answer 10

objects

Question 11

What is the data type of process.argv in Node.js?

Answer 11

arrays of string

Question 12

What is a JavaScript module?

Answer 12

1

Question 13

What values are passed into a Node.js module’s local scope?

Answer 13

1

Question 14

Give two examples of truly global variables in a Node.js program.

Answer 14

1

Question 15

What is the purpose of module.exports in a Node.js module?

Answer 15

to export and use different js file in program

Question 16

How do you import functionality into a Node.js module from another Node.js module?

Answer 16

call the required function with the other file URL

Question 17

What is the JavaScript Event Loop?

Answer 17

An event loop is something that pulls stuff out of the queue and places it onto the function execution stack whenever the function stack becomes empty.

Question 18

What is different between “blocking” and “non-blocking” with respect to how code is executed?

Answer 18

blocking means is something in call stack

non blocking is something that is push from queue to call stack

Question 19

What is a relative file path?

Answer 19

represt path form current director

Question 20

What is an absolute file path?

Answer 20

Represent path from root

Question 21

What module does Node.js include for manipulating the file system?

Answer 21

fs modules

Question 22

What method is available in the Node.js fs module for writing data to a file?

Answer 22

Write

Question 23

Are file operations using the fs module synchronous or asynchronous?

Answer 23

dd