Server Side JavaScript

Question 1

Node.js command to enable the V8 Inspector for debugging

Answer 1

node —inspect

Question 2

Node.js start command

Answer 2

npm start

Question 3

Node.js jest test command

Answer 3

npm run test or npm test

Question 4

Exporting modules in Node.js

Answer 4

Functions: module.exports.functionName or exports.functionName

Classes: default export syntax, new value is added to exports object, like module.exports = Class

Question 5

Set breakpoint on specific line of code

Answer 5

setBreakpoint(line) or sb(line)

Question 6

Watch specific variable

Answer 6

watch(‘variable’)

Question 7

Step to the next line of code

Answer 7

next command

Question 8

Continue code execution

Answer 8

cont command

Question 9

Step into a function call

Answer 9

step command

Question 10

To access variables in any file in the application, variables should be declared using what?

Answer 10

Declared as part of the global object, like global.variable

Question 11

Node.js versioning

Answer 11

^ can be used to allow for version numbers that are in the same major range; comparison operators; ~ can be used for minor range; x allows for things that begin with the number you use

Question 12

In Node.js, which method is used to emit an event?

Answer 12

eventEmitter.emit()

Question 13

In Node.js, which method can be used to attach an event handler to handle the specified event?

Answer 13

eventEmitter.on() or eventEmitter.addListener()

Question 14

Which methods can be used to retrieve an objects file path?

Answer 14

path.dirname(file) or path.parse(file).dir

Question 15

Which method is used to calculate the actual path when it contains relative specifiers (such as ., .., or //)?

Answer 15

path.normalize()

Question 16

Which environment variable is used to de the application mode that determines which features should be enabled or disabled?

Answer 16

NODE_ENV

Question 17

In Node.js code, how can the value of NODE_ENV be accessed?

Answer 17

process.ENV.NODE_ENV

Question 18

When using the Linux or Mac OS, which command is used to set the value of the NODE_ENV variable?

Answer 18

export NODE_ENV=production

Question 19

In the Windows OS, which command can be used to change the NODE_ENV variable?

Answer 19

$env:NODE_ENV = ‘production’

Question 20

In Node.js, which flag can be used to evaluate the passed argument as JavaScript?

Answer 20

node -e “block of code”

Question 21

In Node.js, which flag checked the syntax of the code without executing it?

Answer 21

node -c “black of code”

Question 22

Which Node.js command installs a package?

Answer 22

npm i

Question 23

In Node.js, which module can be used to create a server?

Answer 23

‘http’ or ‘https’

Question 24

In Node.js, which function can be used to handle any incoming server requests?

Answer 24

createServer()

Question 25

Which methods are available to send a server response?

Answer 25

writeHead(), write(), and end()