[Feb 05, 2024] 100% Latest Most updated JavaScript-Developer-I Questions and Answers
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NEW QUESTION # 127
Refer to the code below:
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a specific element, myElement on the page had been clicked?
- A. event.target.id =='myElement'
Answer: A
NEW QUESTION # 128
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..
What is the output when executing the code above
- A. 0
- B. 1
- C. 50Uncaught TypeError: saleItem,desrcription is not a function5080
- D. 5080Uncaught ReferenceError:this,discount is undefined72
Answer: A
NEW QUESTION # 129
A developer wrote the following code:
01 let X = object.value;
02
03 try {
04handleObjectValue(X);
05 } catch (error) {
06 handleError(error);
07 }
Thedeveloper has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs.
How can the developer change the code to ensure this behavior?
- A. 03 try{04 handleObjectValue(x);05 }catch(error){06 handleError(error);07 } then {08 getNextValue();09 }
- B. 03 try {04 handleObjectValue(x)05 ........................
- C. 03 try{04 handleObjectValue(x);05 } catch(error){06 handleError(error);07 } finally {08 getNextValue();10 }
- D. 03 try{04 handleObjectValue(x);05 } catch(error){06 handleError(error);07 }08 getNextValue();
Answer: B
NEW QUESTION # 130
Given the following code:
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on the page is clicked?
- A. button.addEventListener ( 'click')
- B. Event, clicked
- C. o.nodeTarget == this
- D. Event,target.nodename == 'BUTTON"
Answer: D
NEW QUESTION # 131
Given the JavaScript below:
Which code should replace the placeholder comment on line 05 to highlight accounts that match the search string'
- A. null : 'yellow'
- B. 'yellow : 'none'
- C. 'yellow' : null
- D. 'none1 : "yellow'
Answer: B
NEW QUESTION # 132
A developer has the function, shown below, that is called when a page loads.
function onload() {
console.log("Page has loaded!");
}
Where can the developer see the log statement after loading the page in the browser?
- A. Browser javaScript console
- B. Browser performance toots
- C. Terminal running the web server.
- D. On the webpage.
Answer: A
NEW QUESTION # 133
Refer to the expression below:
Let x = ('1' + 2) == (6 * 2);
How should this expression be modified to ensure that evaluates to false?
- A. Let x = (1 + 2) == ( '6' / 2);
- B. Let x = (1+ 2 ) == ( 6 / 2);
- C. Let x = ('1' + 2) == ( 6 * 2);
- D. Let x = ('1' + ' 2') == ( 6 * 2);
Answer: C
NEW QUESTION # 134
A developer is leading the creation of a new browser application that will serve a single page application. The team wants to use a new web framework Minimalsit.js. The Lead developer wants to advocate for a more seasoned web framework that already has a community around it.
Which two frameworks should the lead developer advocate for?
Choose 2 answers
- A. Express
- B. Koa
- C. Vue
- D. Angular
Answer: A,D
NEW QUESTION # 135
Refer to the code below:
for(let number =2 ; number <= 5 ; number += 1 ) {
// insert code statement here
}
The developer needs to insert a code statement in the location shown. The code
statement has these requirements:
1. Does require an import
2. Logs an error when the boolean statement evaluates to false
3. Works in both the browser and Node.js
Which meet the requirements?
- A. assert (number % 2 === 0);
- B. console.assert(number % 2 === 0);
- C. console.debug(number % 2 === 0);
- D. console.error(number % 2 === 0);
Answer: D
NEW QUESTION # 136
Which three browser specific APIs are available for developer to persist data between page loads?
Choose 3 answers
- A. global variables
- B. cookies
- C. indexedDB
- D. IIFEs
- E. localStorage
Answer: C,D,E
NEW QUESTION # 137
A developer wrote the following code:
01 let X = object.value;
02
03 try {
04 handleObjectValue(X);
05 } catch (error) {
06 handleError(error);
07 }
The developer has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs.
How can the developer change the code to ensure this behavior?
- A. 03 try{
04 handleObjectValue(x);
05 } catch(error){
06 handleError(error);
07 }
08 getNextValue(); - B. 03 try {
04 handleObjectValue(x)
05 ........................ - C. 03 try{
04 handleObjectValue(x);
05 } catch(error){
06 handleError(error);
07 } finally {
08 getNextValue();
10 } - D. 03 try{
04 handleObjectValue(x);
05 } catch(error){
06 handleError(error);
07 } then {
08 getNextValue();
09 }
Answer: B
NEW QUESTION # 138
Refer to the following code:
function test (val) {
If (val === undefined) {
return 'Undefined values!' ;
}
if (val === null) {
return 'Null value! ';
}
return val;
}
Let x;
test(x);
What is returned by the function call on line 13?
- A. Line 13 throws an error.
- B. 'Null value!'
- C. Undefined
- D. 'Undefined values!'
Answer: C
NEW QUESTION # 139
A developer at Universal Container creates a new landing page based on HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeewebsiteCotent needs to be executed when the webpage is fully loaded (HTML content and all related files), in order to do some custom initialization.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?
- A. Document,addEventListener ('DCMContentLoaded' , personalizeWebsiteContent);
- B. Window, addEventListener('load', personalizewebsiteContent);
- C. Document, addEventListener ('oDCMContentLoaded' , personalizewensiteContent);
- D. Window, addEventListener('onload', personalizewebsiteContent);
Answer: B
NEW QUESTION # 140
Universal Container (UC) notices that its application allows users to search for account makes a network request each time a key is pressed. This results in too many request for the server to handle.
O address this problem, UC decides to implement a deboune function on the search string change handler. Choose 3 answers
- A. If there is an existing settimeout and the search string changes, allow the existing setTimeout to finish, and do not enqueue a settimeout.
- B. Ensure that the network request has the property debounce set to true,
- C. When the search string changes, enqueue the request within a setTimeout.
- D. If the there is an existing setTimeout and the search string changes, cancel the existing setTimeout using the persisted timeout replace it with a new setTimeout.
- E. Store the timeId of the setTimeout last enqueued by the search string change handler.
Answer: B,C,D
NEW QUESTION # 141
A developer wants to set up a secure web server with Node.js. The developer creates a
directory locally called app-server, and the first file is app-server/index.js
Without using any third-party libraries, what should the developer add to index.js to create the
secure web server?
- A. const http =require('http');
- B. const https =require('https');
- C. const server =require('secure-server');
- D. const tls = require('tls');
Answer: B
NEW QUESTION # 142
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