[Nov 21, 2021] Latest Salesforce Developer JavaScript-Developer-I Actual Free Exam Questions
Salesforce Developer JavaScript-Developer-I Dumps Updated Practice Test and 160 unique questions
How to Study the Salesforce JavaScript-Developer-I Exam
The best study material one can get is the JavaScript-Developer-I practice dumps. To ensure good grades, do attempt the JavaScript-Developer-I practice tests. The JavaScript Developer I from Salesforce typically has 1-2 years of experience as a JavaScript developer with the following JavaScript topics.
JavaScript on the backend
Item Model Document
Monitor (agnostic platform)
Conversion type (inclusive versus explicit)
Classes
Strings
Forms of data and operators
Activities
Control of Mistake
Scope of Variables
Modules
Objects & Arrays: Data Structures
Discharge
Functions (more functions in higher order)
Asynchronous Programming
To prepare for this test, we advise a combination of practical experience, completion of training courses, pathways and self-study in the areas listed in the examination outline section of this examination guide.
NEW QUESTION 56
Refer to the following array:
Let arr1 = [1, 2, 3, 4, 5];
Which two lines of codes result in a second array, arr2, being created such that arr2 is not a reference to arr1? Choose 2 answers
- A. Let arr2 = Array. From (arr1) ;
- B. Let arr2 = arr1 .slice (0, 5);
- C. Let arr2 = arr1;
- D. Let arr2 = arr1 sort ();
Answer: C,D
NEW QUESTION 57
Refer to the code below:
What are the values for first and second once the executes?
- A. First is why and second is when.
- B. First is who and second is where.
- C. First is who and second is when.
- D. First is why and second is where.
Answer: D
NEW QUESTION 58
At Universal Containers, every team has its own way of copying JavaScript objects. The code snippet shows an implementation from one team:
What is the output of the code execution?
- A. Hello John Doe
- B. TypeError: Assignment to constant variable
- C. Hello Dan Doe
- D. TypeError: dan.name is not a function
Answer: D
NEW QUESTION 59
Refer to the HTML below:
Which JavaScript statement results in changing ''Tony'' to ''Mr. T. ''?
- A. Document.querySelector (' '#main li:second-child') innerHTML, = Mr, T, ';
- B. Document.querySelector (''#main li:nth-child (2) ') , innerHTML = 'Mr . T ';
- C. Document.querySelectorAll ('#main # TONY ') , innerHTML = Mr, T , ' ;
- D. Document.querySelectorAll ( '#main li, Tony ' ) innerHTNL = Mr, T , ' ;
Answer: C
NEW QUESTION 60
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 61
Which code statement correctly retrieves and return an object from localStorage?
A)
B)
C)
D)
- A. Option B
- B. Option C
- C. Option A
- D. Option D
Answer: D
NEW QUESTION 62
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 63
A developer writes the code below to calculate the factorial of a given number.
What is the result of executing line 04?
- A. 0
- B. RuntimeError
- C. 1
- D. -Infinity
Answer: B
NEW QUESTION 64
Refer to the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));
When does Promise.finally on line 08 get called?
- A. WHen resolved
- B. When resolved or rejected
- C. When rejected
- D. When resolved and settled
Answer: B
NEW QUESTION 65
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 66
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 67
A developer implements a function that adds a few values.
Which three options can the developer invoke for this function to get a return vale of 10? Choose 3 answers
- A. Sum (5) (5)
- B. Sum (10) ()
- C. Sum () (5, 5)
- D. Sum (5, 5) ()
- E. Sum () (10)
Answer: A,C,E
NEW QUESTION 68
A developer creates an object where its properties should be immutable and prevent properties from being added or modified.
Which method should be used to execute this business requirement?
- A. Object. filebase ( )
- B. Object. real ( )
- C. Object const ( )
- D. Object. Lock ( )
Answer: A
NEW QUESTION 69
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 70
Cloud Kicks has a class to represent item for sale in an online store, as shown below:
A new business requirement comes in that request a clothingitem class, that should have all of the properties and methods of the item class, but will also have properties that are specific top clothes.
Which line of code properly declares the clothingitem class such that it inherits from item?
- A. Class clothing item super item (
- B. Class Clothingitem (
- C. Class clothingitem extends item (
- D. Class clothingitem implements item (
Answer: C
NEW QUESTION 71
Refer to the code below:
Which code change should be made for the console to log only Row log when 'Click mel' is clicking?
- A. Add event,stopPropagation (); to printMessage function.
- B. Add event,stopPropagation (); to window,onLoad event hadler.
- C. Add event,stopPropagation (); to window.onLoad event hadler.
- D. Add event,stopPropagation (); to printMessage function.
Answer: C,D
NEW QUESTION 72
Which code statement below correctly persists an objects in local Storage ?
- A. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.persist(storageKey, jsObject);
} - B. const setLocalStorage = (storageKey, jsObject) => {
window.localStorage.setItem(storageKey, JSON.stringify(jsObject));
} - C. const setLocalStorage = ( jsObject) => {
window.localStorage.setItem(jsObject);
} - D. const setLocalStorage = ( jsObject) => {
window.localStorage.connectObject(jsObject));
}
Answer: B
Explanation:
NEW QUESTION 73
Refer to the code below:
What is the result of running line 05?
- A. aPromise and bPromise run sequentially.
- B. Neither aPromise or bPromise runs.
- C. Only apromise runs.
- D. Apromise and bpromise run in parallel.
Answer: B
NEW QUESTION 74
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