Salesforce JavaScript-Developer-I Practice Verified Answers - Pass Your Exams For Sure! [2022]
Valid Way To Pass Salesforce Developer's JavaScript-Developer-I Exam
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NEW QUESTION 21
Which three options show valid methods for creating a fat arrow function? Choose 3 answers
- A. { } => { console.log (executed') ; )
- B. X => {console.log {'executed'} ; }
- C. (x, y, z) => (console.log ('executed') ;)
- D. ( ) => { console.log (' executed') ; )
- E. X, y, z => ( console.log ('executed') ; )
Answer: B,C,D
NEW QUESTION 22
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];
Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?
- A. Let arr2 = arr1.sort();
- B. Let arr2 = arr1;
- C. Let arr2 = Array.from(arr1);
- D. Let arr2 = arr1.slice(0, 5);
Answer: C,D
NEW QUESTION 23
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. 2.0.0
- B. 1.2.0
- C. 1.1.4
- D. 1.2.3
Answer: B
NEW QUESTION 24
Refer to the code below:
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this? Choose 2 answers
- A. {type ; update ', recordId : '123abc')
- B. 'update', {
Detail ; {
recordId, '123abc
)
) - C. 'update', ( recordId ; 123abc'
) - D. 'update' , '123abc'
Answer: B,C
NEW QUESTION 25
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array. The test passes:
A different developer made changes to the behavior of sum3 to instead sum all of the number present In the array.
Which two results occur when running the test on the updated sum3 function?
Choose 2 answers
- A. The line 02 assertion fails.
- B. The line 05 assertion fails.
- C. The line 02 assertion passes.
- D. The line 05 assertion passes.
Answer: B,C
NEW QUESTION 26
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. Uses non-blocking functionality for performant request handling
- B. Performs a static analysis can code before execution to look for runtime errors.
- C. Executes server-side JavaScript code to avoid learning a new language.
- D. Ensure stability with one major release every few years.
- E. Installs with its own package manager to install and manage third-party libraries.
Answer: B
NEW QUESTION 27
Which statement can a developer apply to increment the browser's navigation history without a page refesh?
- A. Window.history,state,push.(newStateObject, ' ' null;
- B. Window.history,pushState.(newStateObject, ' ', null)) ;
- C. Window.history,pushState.(newStateObject);
- D. Window.history,state,push.(newStateObject);
Answer: A
NEW QUESTION 28
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, 4]
- B. [1, 2, 3, 4, 4, 5, 4]
- C. [1, 2, 3, 4, 5, 4]
- D. [1, 2, 3, 5]
Answer: B
Explanation:
NEW QUESTION 29
Universal Containers recently its new landing page to host crowd-function campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, It creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below.
All the elements included the same ad-library-item class. They are hidden by default, and they are randomly displayed while the user navigation through the page.
Tired of all the ads, what can the developer do to temporarily and quickly remove them?
- A. Use the browser console to execute a script that removes all the elements containing the class ad-library-item.
- B. Use the DOM inspector to remove all the elements containing the call ad-library -item.
- C. Use the browser console to execute a script that prevents the load event to be fired.
- D. Use the DOM inspector to prevent the load event to be fired.
Answer: A
NEW QUESTION 30
Which statement accurately describes the behavior of the async /swait keywords?
- A. The associated function sometimes returns a promise.
- B. The associated function can only be called via asynchronous methods.
- C. The associated class contains some asynchronous functions.
- D. The associated function will always return a promise.
Answer: D
NEW QUESTION 31
Refer to the code below:
01 const exec = (item, delay) =>{
02 new Promise(resolve => setTimeout( () => resolve(item), delay)),
03 async function runParallel() {
04 Const (result1, result2, result3) = await Promise.all{
05 [exec ('x', '100') , exec('y', 500), exec('z', '100')]
06 );
07 return `parallel is done: $(result1) $(result2)$(result3)`;
08 }
}
}
Which two statements correctly execute the runParallel () function?
Choose 2 answers
- A. runParallel ( ). done(function(data){
return data;
}); - B. runParallel () .then(data);
- C. runParallel () .then(function(data) return data
- D. Async runParallel () .then(data);
Answer: A,C
NEW QUESTION 32
A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current dat. The code line below is responsible for this calculation.
Const deliveryDate = new Date ( );
Due to changes in the business requirements, the delivery date must now be today's date + 9 days.
Which code meets this new requirements?
- A. deliveryDate. setDate (( new Date ()) .getDate () + 9);
- B. deliveryDate. setDate ( Date . current () + 9 0;
- C. deliveryDate. Date = new Date (+9) ;
- D. deliveryDate . date = date . current () + 9
Answer: A
NEW QUESTION 33
Refer to the code below:
What is the value of result when Promise. race executes?
- A. Car 1 crashed the race
- B. Car 3 completed the race
- C. Car 2 completed the race
- D. Race is cancelled.
Answer: A
NEW QUESTION 34
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
- A.
- B.
- C.
- D.
Answer: A
NEW QUESTION 35
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. Event,target.nodename == 'BUTTON"
- B. Event, clicked
- C. o.nodeTarget == this
- D. button.addEventListener ( 'click')
Answer: A
NEW QUESTION 36
Which statement parses successfully?
- A. JSON. parse (""foo"');
- B. JSON.parse (""foo'");
- C. JSON.parse ("foo");
- D. JSON.parse ("foo");
Answer: A
NEW QUESTION 37
A developer has an ErrorMandler module that contains multiple functions.
What kind of export should be leveraged so that multiple function can be used?
- A. Multi
- B. Named
- C. All
- D. default
Answer: B
NEW QUESTION 38
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?
- A. > 5 > -1
- B. > 5 >undefined
- C. > 5 > 0
- D. > true > false
Answer: B
Explanation:
NEW QUESTION 39
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below:
All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.
- A. Use the browser to execute a script that removes all the element containing the class ad-library-item.
- B. Use the browser console to execute a script that prevents the load event to be fired.
- C. Use the DOM inspector to prevent the load event to be fired.
- D. Use the DOM inspector to remove all the elements containing the class ad-library-item.
Answer: A
NEW QUESTION 40
Refer to the code below:
What is the output if this function when called with an empty array?
- A. Return 10
- B. Retruns 0
- C. Return NaN
- D. Throws an error
Answer: A
NEW QUESTION 41
The developer wants to test the code:
Const toNumber = (strOrNum) => + strOrNum;
Which two tests are most accurate for this code? Choose 2 answers
- A. Console,assert (toNumber ( '-3') < 0);
- B. Console.assert (toNumber ('2') === 2 ) ;
- C. Console. Assert (Number,isNaN (toNumber ( ) ));
- D. Console,assert (toNumber ( ) === NaN ) ;
Answer: B,D
NEW QUESTION 42
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How to Prepare for Salesforce JavaScript Developer I Exam
Preparation Guide for Salesforce JavaScript Developer I Exam
Introduction
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