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rc0122 > es6 > Flashcards

es6 Flashcards

1
Q

What is a code block? What are some examples of a code block?

A

i code block is whatever inside {}, functions, if conditions and loops all have code blocks

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2
Q

What does block scope mean?

A

it means that its scope only to whatever is inside the curly braces

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3
Q

What is the scope of a variable declared with const or let?

A

its scope to only inside the code block

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4
Q

What is the difference between let and const?

A

let is changeable but const is not

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5
Q

Why is it possible to .push() a new value into a const variable that points to an Array?

A

because we are pushing elements to the array but we are not reassigning the array.

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6
Q

How should you decide on which type of declaration to use?

A

let is usually used on variables that will have their values changed or reassigned. const is used for objects or arrays or values that will stay consistent throughout the function

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7
Q

What is the syntax for writing a template literal?

A

the syntax is backticks ` `

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8
Q

What is “string interpolation”?

A

its embedding variables into a string and getting the results of it

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9
Q

What is destructuring, conceptually?

A

taking values from properties and assigning it to a different variables

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10
Q

What is the syntax for Object destructuring?

A

const {} = object

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11
Q

What is the syntax for Array destructuring?

A

const [] = array

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12
Q

How can you tell the difference between destructuring and creating Object/Array literals?

A

an object will have {} and an array will have []

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13
Q

What is the syntax for defining an arrow function?

A

() => {

}

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14
Q

When an arrow function’s body is left without curly braces, what changes in its functionality?

A

it will return

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15
Q

How is the value of this determined within an arrow function?

A

a normal function will create its own content for this but the arrow function will inherit it

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16
Q

What is a CLI?

A

command-line interface

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17
Q

What is a GUI?

A

graphical-user interface

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18
Q

man

A

man gives us the option to view what a command name is a synopsis of the command and a description of what the command does

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19
Q

cat

A

it concatenates files and prints it

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20
Q

ls

A

the ls command gives us a list of our files or list directory contents

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21
Q

pwd

A

it prints the name of the current or working directory

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22
Q

echo

A

it displays a line of text

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23
Q

touch

A

change file timestamp

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24
Q

mkdir

A

it makes directories

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25
Q

mv

A

it moves files or renames them

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26
Q

rm

A

it removes files or directories

27
Q

cp

A

copy files and directories

28
Q

What is Node.js?

A

As an asynchronous event-driven JavaScript runtime, Node.js is designed to build scalable network applications.

29
Q

What can Node.js be used for?

A

for handling back end server requests

30
Q

What is a REPL?

A

an interactive shell that processes Node. js expressions

31
Q

When was Node.js created?

A

it was created May 27, 2009

32
Q

What back-end languages have you heard of?

A

java

33
Q

what is a directory?

A

a folder on our hard drive that holds files

34
Q

what is a relative file path?

A

internal path in same directory file path relative to where you’re currently at

35
Q

what is an absolute file path?

A

the full file path to get to a specific file/folder

36
Q

what module does node.js includes for manipulating the file system

A

fs module

37
Q

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

A

fs.writefile

38
Q

Are file operations using the fs module synchronous or asynchronous?

A

asynchronous

39
Q

What is a client?

A

clients are devices that request service from the server

40
Q

What is a server?

A

A server is a computer program or device that provides a service to another computer program and its user

41
Q

Which HTTP method does a browser issue to a web server when you visit a URL?

A

GET

42
Q

What is on the first line of an HTTP request message?

A

the method the target and the version

43
Q

What is on the first line of an HTTP response message?

A

the status line

44
Q

What are HTTP headers?

A

let the client and the server pass additional information with an HTTP request or response

45
Q

Is a body required for a valid HTTP message?

A

no

46
Q

What is NPM?

A

it’s open-source for sharing and borrowing packages

47
Q

What is a package?

A

is a directory with one or more files in them

48
Q

How can you create a package.json with npm?

A

by using the command npm init -y

49
Q

What is a dependency and how do you add one to a package?

A

dependencies are packages that are required by the application in production, and to add one to the package we run the command npm install

50
Q

What happens when you add a dependency to a package with npm?

A

it installs to the directory we are working on

51
Q

How do you add express to your package dependencies?

A

by using the command npm install express

52
Q

What Express application method starts the server and binds it to a network PORT?

A

the listen method

53
Q

How do you mount a middleware with an Express application?

A

by using the send method

54
Q

Which objects does an Express application pass to your middleware to manage the request/response lifecycle of the server?

A

req and res

55
Q

What is the appropriate Content-Type header for HTTP messages that contain JSON in their bodies?

A

application/json; charset=utf-8

56
Q

What is Array.prototype.filter useful for?

A

filtering the array

57
Q

What is Array.prototype.map useful for?

A

creating a new version of the array

58
Q

What is “syntactic sugar”?

A

its designed to make the code easier to read

59
Q

What is the typeof an ES6 class?

A

function

60
Q

Describe ES6 class syntax.

A

class keyword and the constructor

61
Q

What is “refactoring”?

A

restructuring the code without changing its behavior

62
Q

What does express.static() return?

A

a function

63
Q

What is the local __dirname variable in a Node.js module?

A

a dirname gives us the directory name

64
Q

What does the join() method of Node’s path module do?

A

it joins the path together

rc0122 (7 decks)

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