2021 Realistic Verified Free Salesforce JavaScript-Developer-I Exam Questions
JavaScript-Developer-I Real Exam Questions and Answers FREE
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NEW QUESTION 81
A developer wants to leverage a module to print a price in pretty format, and has imported a method as shown below:
Import printPrice from '/path/PrincePrettyPrint. Js';
Based on the code, what must be true about the printPrice function of the PricePrettyPrint modules for this import to work?
- A. printPrice must be a multi export
- B. printPrice must be named export
- C. printPrice must be an all export
- D. printPrice must be an default export
Answer: B
NEW QUESTION 82
Refer to the code below:
What is the result of running line 05?
- A. Neither aPromise or bPromise runs.
- B. Apromise and bpromise run in parallel.
- C. Only apromise runs.
- D. aPromise and bPromise run sequentially.
Answer: A
NEW QUESTION 83
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,target.nodename == 'BUTTON"
- C. o.nodeTarget == this
- D. Event, clicked
Answer: B
NEW QUESTION 84
A developer creates a class that represents a blog post based on the requirements that a Post should have a body, author, and view count. The code is shown below:
Which statement should be inserted in the placeholder on line 02 to allow for a variable to be sent to a new instance of a port with the three attributes correctly populated?
- A. Function Post (body, author, viewCount) (
- B. Constructor (body, author, viewCount) (
- C. Super (body, author, viewCount) (
- D. Constructor ( ) (
Answer: B
NEW QUESTION 85
A developer publishes a new version of a package with new feature that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number be?
- A. 1.2.3
- B. 1.2.0
- C. 1.1.4
- D. 2.0.0
Answer: B
NEW QUESTION 86
Considering type coercion, What does the following expression evaluate to?
True + ) + '100 ' + null
- A. '4100null'
- B. '3100null'
- C. 0
- D. 1
Answer: A
NEW QUESTION 87
In which situation should a developer include a try... catch block around their function call?
- A. The function might raise a runtime error that needs to be handled.
- B. The function contains scheduled code.
- C. The function has an error that should not be silenced.
- D. The function results in an out of memory issue.
Answer: A
NEW QUESTION 88
Refer to the code below:
When does promise. Finally on line 08 get called?
- A. When rejected
- B. When resolved and settled
- C. When resolved
- D. When resolved or rejected
Answer: D
NEW QUESTION 89
Refer to the code:
Given the code above, which three properties are set pet1?
Choose 3 answers:
- A. Owner
- B. Size
- C. canTalk
- D. Type
- E. Name
Answer: B,C,D
NEW QUESTION 90
Refer to the expression below:
Let x = ('1' + 2) == (6 + 2) ;
How should this expression be modified to ensure that a evaluated 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 91
Refer to the code below:
What is displayed when myfunction(true) is called?
- A. 2 2 1 2
- B. 2 2 2 2
- C. 2 2 1 1
- D. 2 2 undefined undefined
Answer: C
NEW QUESTION 92
A developer is debugging a web server that uses Node.js. The server hits a runtime error every third request to an important endpoint on the web server.
The developer added a break point to the start script, that is at index, js at the root of the server's source code. The developer wants to make use of Chrome DevTools to debug.
Which command can be run to access DevTools and make sure the breakpoint is hit?
- A. Node --inspect -brk index , js
- B. Node inspect index , js
- C. Node -I index , js
- D. Node -- inspect index ,js
Answer: D
NEW QUESTION 93
Given the HTML below:
Which statement adds the priority-account CSS class to the Unversal Containers row?
- A. Document. querySelectorAll ( '# row-uc ') .classList. add ('priority-account');
- B. Document. queryselector ('# row-uc') ,classes. Push (' priority-account');
- C. Document. querySelector ( 'row-uc') . classList. Add ( 'pariority-account') ;
- D. Document. getElementById ( 'row-uc') addClass ( ' priority-account');
Answer: C
NEW QUESTION 94
A developer has a web server running with Node.js. The command to start the web server is node server.js. The web server started having latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?
- A. NODE_DEBUG=true node server.js
- B. NODE_DEBUG=http,https node server.js
- C. DEBUG=http, https node server.js
- D. DEBUG=true node server.js
Answer: D
NEW QUESTION 95
A developer creates a generic function to log custom messages In the console. To do this, the function below is implemented.
Which three console logging methods allow the use of string substitution in line 02?
Choose 3 answers
- A. Log
- B. Assert
- C. Info
- D. error
- E. Message
Answer: B,D,E
NEW QUESTION 96
Refer to the code below:
After running this code, which result is displayed on the console?
- A. > True
> False - B. > 5
> Undefined - C. > 5
> 0 - D. > 5
>- 1
Answer: D
NEW QUESTION 97
Refer to the code snippet below:
Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i < array.length; i++)
if (array[i] === 4) {
array.splice(i, 1);
}
}
What is the value of array after the code executes?
- A. [1, 2, 3, 4, 5, 4]
- B. [1, 2, 3, 4, 5, 4, 4]
- C. [1, 2, 3, 5]
- D. [1, 2, 3, 4, 4, 5, 4]
Answer: D
NEW QUESTION 98
Refer to the HTML below:
<p> The current status of an order: < span> id='' status '> In progress < /span> < /p> Which JavaScript Statement changes the text 'In Progress' to Completed'?
- A. Document, getElementById (status'') , value = completed' ;
- B. Document, getElementById (''status''), innerHTML = 'Completed' ;
- C. Document, getElementById ('',status''), innerHTML = 'Completed' ;
- D. Document, getElementById (''# status''), innerHTML = 'Completed' ;
Answer: B
NEW QUESTION 99
Refer to the code below:
A developer import a library that creates a web server. the imported library uses events and callback to start the server.
Which code should be inserted at line 03 to set up an event and start the web server?
- A. server( );
- B. server ( (port) => (
Console.log ('Listening on' , port) ;
}}; - C. Server .start();
- D. Server. on ('connet' , (port) => (
Console.log (Listening on' port);
}};
Answer: B
NEW QUESTION 100
Refer to the code below:
What value can a developer expect when referencing o,js,secondCity?
- A. An error
- B. Undefined
- C. 'New York
- D. 'new york'
Answer: D
NEW QUESTION 101
Given the code below:
What is the expected output?
- A. Both lines 08 and 09 are executed, and the variables are outputted.
- B. Line 08 throws an error, therefore line 09 is never executed.
- C. Both lines 06 and 09 are executed, but the values outputted are undefined.
- D. Line 08 outputs the variable, but line 09 throws an error.
Answer: D
NEW QUESTION 102
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
A)
B)
C)
D)
- A. Option C
- B. Option A
- C. Option B
- D. Option D
Answer: B
NEW QUESTION 103
A developer is trying to convince management that their team will benefit from using Node.JS for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Which three benefits of Node.js can the developer use to persuade their manager?
- A. Installs with its own package manager to install and manage third-party libraries.
- B. Executes server-side JavaScript code to avoid learning a new language.
- C. Uses non-blocking functionality for performant request handling
- D. Performs a static analysis can code before execution to look for runtime errors.
- E. Ensure stability with one major release every few years.
Answer: D
NEW QUESTION 104
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