2334 Final Exam
In a React component, the onSubmit attribute is added to the ___ element to specify a submit event handler
<form>
Given HTML and JQuery code, what is the resulting DOM transformation? <p>It is <em>so much</em> fun to learn <strong>new</strong> things!</p> $("em").wrap("<strong></strong>");
<p>It is <strong><em>so much</em></strong> fun to learn <strong>new</strong> things!</p>
which compound assignment operator assigns numbers with 9
*=
The JavaScript code contains a function convertPrice(), which converts the price from one currency to another. What is the correct way to call convertPrice() when the amount field is changed?
$("#amount").change(convertPrice);
Which line of code adds the property to center the text for <h2> elements?
$("h2").css("text-align", "center");
Which line of code adds class highlight to all <li> tags that descend from a <ul> tag?
$("ul li").addClass("highlight");
What is one purpose of npm? a. Loads packages as a Node.js project is running b. Updates and installs packages for a Node.js project c. Compiles a Node.js project into a single JavaScript file
??
What replaces XXX in the code below so log reQuest() executes before any route callback functions a. app.logRequest() b. app.use(logRequest) c. logRequest()
??
How should a project created with Create React App be modified so the App component can use Bootstrap classes? a. Add a link element to index.html that imports Bootstrap b. Add a style element to index.html that includes the definition of all Bootstrap classes c. Create an App.css that include, all the Bootstrap classes
???
What can be inferred about the jQuery library in this line of code? <script src="jquery-3.5.0.min.js"></script> a. This library was minified to reduce file size b. This library will not download, because the cross-origin attribute is missing c. The code in this library was extended, to make it more programmer friendly
???
Which jQuery selector type is $("li:last") a. Basic filter selector b. Attribute selector c. Content filter selector
???
The TodoItems component renders the item list with li elements: <li key=(item.key)>. What is assigned to item.key? a. Integer indicating when the item was added b. Item's array index c. Sixteen character has value
????
What makes JSON a preferred way to transport Ajax data? a. JSON data looks more like HTML code b. The jQuery library has more functions for parsing JSON data c. JSON data is parsed automatically
????
How does the unshift() method change the following array()
Adds blue to beginning of array
In the following delete click event handler to delete a song, when is the done() method called?
After the song is deleted
Which is the correct order of events in token based authentication AGet request for protected resource BToken generated CPost request with username and password DToken Validation
CBAD
How can the code segment ensure the movie API returns a valid movie with ID 456
Check value of response.ok
Fill in the blank to eliminate the owner property from the pokemon object
delete
In a typical Node.js file structure, where is a Mongoose model stored?
In a separate directory for models
What middleware enables an Express application to parse data posted from a web form?
express.urlencoded()
Which of the given allows for the reuse of code blocks in Pug
Mixins
In JQuery, when is the ready event triggered?
Once the document object model has been loaded
What information does the jwt-simple module's encode and decode methods need to encode and decode a JWT
Server's secret key
Why might a programmer add an empty array as the second argument to use Effect()
So the function argument is called only once
Which React Bootstrap component is typically used to indicate that the user must wait for an action to complete?
Spinner
What happens if a React list is rendered that is missing a key?
The list displays along with a console warning
Why is a key sometimes needed to access a third- party web-based API
To obtain a key, a developer must agree to restrictions on data received
What is output to the console?
["Are you t", "lking to me?"]
What is missing from the call to fetch() to POST a JSON-encoded movie to a movie API
body: JSON.stringify(movie)
What attribute of an input element can be validated when text is entered on a webpage?
value
the variable findCost has_____
local scope
A programmer uses a ____ function to parse data that is posted to a route in an express application
middleware
the ____ tool is used to tun Create React App, and then ____ is used to start development web server that listens on port 3000
npx, npm
How is the age field accessed after the following code executes?
obj.age
In the following JSON, the data type of friends is ______
object
Which XXX assigns a click event handler to the React component's button?
onClick=(clickHandler)
A react component's submit event handler usually calls event.preventDefault() in order to ____
stop the browser from submitting from data in an HTTP request
What XXX is missing so the Movie component below displays the movie's title attribute
{ props.title}
