WebApp Midterm

Which of the following is not a JavaScript engine found in a browser:?

Neptune

JavaScriptCore

SpiderMonkey

Which of the following is not a language that Node.js is written in?

C++

JavaScript

Assembler

According to the Medium article what does the author Argwal state Node.js can do easily that a browser has limited or no ability to do?

What version of JavaScript should you set the WebStorm IDE to according to the class 1 notes?

ES5

ECMAScript 7

ECMAScript 6

ECMAScript 2017

What does the command npm --init do?

Creates a new package.json file

Creates a new project.json file

Creates a new project directory and meta data

Creates a new project directory

What does the --save switch do on a npm install command?

Saves the package in the global area

Saves the package to the local folder

Updates the package.json file

Records the output of the installation to a log file

If I have a node package with version 2.79.0, what does the zero represent?

Incremental release number

Minor release number

Patch number

Major release number

Which of the following are valid lines of code if you wanted to have your code use ES6 syntax?

A) let multiply = (x, y) => x * y;

b) var multiply = function(x, y) {return x*y;}

C) let multiply = (x, y) => { return x * y }

D) either a) or b)

E) either a) or c)

The terms ES6 and ES2015 are interchangeable?

True

False

What yargs method do you use to give an alternative name to a parameter?

Resolve

Argv

Alias

Process

What is the argument passed in a promise.all statement sometimes known as?

Promise.all does not accept arguments

An iterable

A promise chain

A callback

How many arguments are in a standard "callback interface"? :

The "await" keyword is an alternative to using a .then method?

True

False

I must export a function with the same name that it was defined with?

True

False

What 2 callbacks do we provide to a promise? :

Resolve, reject

Resolve, process

Await, reject

Resolve, await

What is the last method executed in a yargs command?

Process

Argv

Resolve

Alias

The correct syntax for referencing a module in the same folder as a driver program would be:

Const rtns = require('.someroutines')

Const rtns = require('../someroutines')

Const rtns = require('./someroutines')

Const rtns = require('/someroutines')

If I use an "await" in a function, that function must be declared with the async keyword?

True

False

Which of the following best describe how the GOC data was obtained in lab2?

We used a callback wrapped in a promise to obtain the data

We used a promise to obtain the data

We used a callback to obtain the data

We used a chain of promises to obtain the data

What does the acronym UTF-8 stand for?

Uniform Transformation Format 8 bit

Uniform Translation Format 8 bit

Unicode Transformation Format 8 bit

Unicode Translation Format 8 bit

What two parameters are passed to the callback in the fs.readFile method? :

An error object and the contents from the read

Contents from the read, and the file status

An error object and a write buffer

A read buffer and a write buffer

What characters did we run the string method split on? :

Newline, return

Newline, tab

Tab, return

Newline, backspace

When manually building the json array, what array method was used to add entries into the array?

Shift

Push

Splice

Unshift

What file system method was utilized to determine whether a file existed or not?

.determine

.exists

.stat

.locate

Which intrinsic JSON method is used convert objects to strings?

.toString

.Parse

.makeString

.Stringify

If I have some JSON that is not in an array I can still determine the number of elements in it?

True

False

For the case study we received all the necessary JSON from a single URL?

True

False

What file was created to contain constants for our program?

Env.json

Constants.json

Dotenv

.env

For the case study, the number of countries must match the number of alerts?

True

False

What database construct in Mongo is analogous to a table in a relational database?

Collection

Database

Document

Field

When working with the Mongo driver, if you connect to a database that doesn't exist, a new one is created for you?

True

False

Mongo uses the V8 JavaScript engine internally to process JavaScript?

True

False

What property of the returned variable from the userRoutines.UpdateOne method did we check to ensure the update worked?

DocumentsModified

ModifiedCount

DocumentsUpdated

UpdatedCount

What property of the returned variable from the userRoutines.DeleteOne method did we check to ensure the delete worked?

DocumentsDeleted

DeletedCount

RemovedCount

DocumentsRemoved

A promise is returned with the following code: db.collection('users').findOne({name: name})

True

False

When updating a document using the Mongo driver's updateOne method, what do we supply as the first argument in the update JSON?

Int representing the number of documents that were updated

An error variable

An ObjectId

The property(ies) to be updated

What database construct in Mongo is analogous to a row in a relational database?

Collection

Document

Field

Database

What property of the returned variable from the userRoutines.AddOne method did we check to ensure the add worked?

DocumentsInserted

DocumentsAdded

AddedCount

InsertedCount

What database construct in Mongo is analogous to a column in a relational database?

Database

Document

Field

Collection

Which of the following is not a real example of invoking middleware?

App.use...

App.get...

App.METHOD...

App.post....

Which of the following terms was given as an example of builtin middleware?

Static

Router

Application

Error

Which of the following is the correct format when specifying a GET route for a particular item?

Router.get('/somepath/${someparam}'....

Router.get('/somepath/someparam'....

Router.get('/somepath/{:someparam}'....

Router.get('/somepath/:someparam'....

What object or objects are available to the routing middleware when processing a GET request?

We should frequently use the nodemon package in a production environment

True

False

How many parameters would I provide to the callback when coding error middleware?

How many parameters would I provide to the callback when coding application middleware?

What event handler did we code on the MaterialUI component that filtered an array of strings?

What’s the name of the MaterialUI component that allows filtering of an array of strings?

FilterText

AutoComplete

SelectOne

FindOne

We used 3 parameters when doing a POST from the react client to our node backend this class?

True

False

What is the main container component for Material-UI?

< MuiTheme >

< Mui >

< MuiProvider >

< MuiThemeProvider >

What package is installed to support Material-UI?

Material

Google-ui

Material-google

Material-ui

What library did we call when issuing HTTP GET for remote server data from the react client?

Fetch

Request

Httprequest

Axios

This attribute has valid syntax for providing an inline style in JSX: style={margin-top: '10%', width: '80%'}

True

False

We used the array "Index" method to locate the desired user after obtaining the data from the server this class?

True

False

What syntax do you use to supply an inline style?

A) style={regular styles go here}

B) style={styles in JSON go here}

C) either a) or b)

D) None of the above

What syntax can you use to conditionally render a component in JSX?

{ if some-condition ....}

{ {expression && ...} }

{expression && ...}

{ { if some-condition ....} }

Which of the following does a browser's JavaScript engine not do?

The browser engine is aware of the outside world?

True

False

What territory does Node allow JavaScript to enter?

Server-Side

Client-Side

Both

Best description of the term Non-blocking

Fat arrow

Pointer

Async

Synchronous

If I have a node package with version 3.80.2 what does the 80 stand for?

Incremental release number

Minor release numberp

Patch number

Major release number

If I have a node package with version 3.80.2 what does the 3 stand for?

Major release number

Incremental release number

Minor release number

Patch number

What ES2015 construct did we use to output formatted data to the console?

Fat arrow

Template literal

Async

None of the above

Which one of these were not the 3 main client side packages bundled in the starter zip file?

React

Babel

Nodemon

Webpack

What JavaScript file contains the default component in the react starter package?

Index.js

App.js

Index.js

App.js

I can set a state variable's data like this: let someStateVar = 'some stuff'

True

False

We can use an attribute to pass data into a JSX component?

True

False

What does a react element use instead of the standard attribute class?

Class

ClassName

AttrClass

The Constructor is responsible for initializing state in a React class component?

True

False

What JavaScript file renders the output for the single page application in the react starter package?

Index.js

App.js

What script is executed to initiate the development server in the react starter project?

Webstart

Init

Start

Build

What is actually "the page" of the single page application in the react starter project?

App.html

Index.js

App.js

Index.html

When creating a stateful react component what do we extend?

T/F Middleware functions do not have full access to the request and response objects?

True

False

Nodemon allows us to restart the server automatically when things are saved

True

False

Middleware is a filter that stands between the web server and service

True

False

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