JavaScript-Developer-I | A Review Of Approved JavaScript-Developer-I Pdf Exam
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Free demo questions for Salesforce JavaScript-Developer-I Exam Dumps Below:
NEW QUESTION 1
Which statement phrases successfully?
- A. JSON.parse ( ‘ foo ’ );
- B. JSON.parse ( “ foo ” );
- C. JSON.parse( “ ‘ foo ’ ” );
- D. JSON.parse(‘ “ foo ” ’);
Answer: D
NEW QUESTION 2
Which javascript methods can be used to serialize an object into a string and deserialize a JSON string into an object, respectively?
- A. JSON.stringify and JSON.parse
- B. JSON.serialize and JSON.deserialize
- C. JSON.encode and JSON.decode
- D. JSON.parse and JSON.deserialize
Answer: A
NEW QUESTION 3
Given the JavaScript below:
1 function filterDOM (searchString) {
2 const parsedSearchString = searchString && searchString.toLowerCase() ;
03 document.quesrySelectorAll(‘ .account’ ) . forEach(account => (
04 const accountName = account.innerHTML.toLOwerCase();
05 account. Style.display = accountName.includes(parsedSearchString) ? /*Insert code*/;
06 )};
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do not match thesearch string?
- A. ‘ name ’ : ‘ block ’
- B. ‘ Block ’ : ‘ none ’
- C. ‘ visible ’ : ‘ hidden ’
- D. ‘ hidden ’ : ‘ visible ’
Answer: B
NEW QUESTION 4
Refer to the code below:
Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];
Which two statements result in the array [1, 2, 3, 4, 5] ?
Choose 2 answers
- A. [ ]. Concat.apply ([ ], inArray);
- B. [ ]. Concat (... inArray);
- C. [ ]. concat.apply(inArray, [ ]);
- D. [ ]. concat ( [ ….inArray ] );
Answer: AB
NEW QUESTION 5
Which function should a developer use to repeatedly execute code at a fixed interval ?
- A. setIntervel
- B. setTimeout
- C. setPeriod
- D. setInteria
Answer: A
NEW QUESTION 6
A developer has an ErrorHandler module that contains multiple functions. What kind of export be leverages sothat multiple functions can be used?
- A. Named
- B. All
- C. Multi
- D. Default
Answer: A
NEW QUESTION 7
Refer to the following code:
<html lang=”en”>
<body>
<div onclick = “console.log(‘Outer message’) ;”>
<button id =”myButton”>CLick me<button>
</div>
</body>
<script>
function displayMessage(ev) { ev.stopPropagation(); console.log(‘Inner message.’);
}
const elem =document.getElementById(‘myButton’); elem.addEventListener(‘click’ , displayMessage);
</script>
</html>
What will the console show when the button is clicked?
- A. Outer message
- B. Outer message Inner message
- C. Inner message Outer message
- D. Inner message
Answer: D
NEW QUESTION 8
A developer has the following array of student test grades: Let arr = [ 7, 8, 5, 8, 9 ];
The Teacher wants to double each score and then see an array of the students who scored more than 15 points.
How should thedeveloper implement the request?
- A. Let arr1 = arr.filter(( val) => ( return val > 15 )) .map (( num) => ( return num *2 ))
- B. Let arr1 = arr.mapBy (( num) => ( return num *2 )) .filterBy (( val ) => return val > 15 )) ;
- C. Let arr1 = arr.map((num) => num*2). Filter (( val) => val > 15);
- D. Let arr1 = arr.map((num) => ( num *2)).filterBy((val) => ( val >15 ));
Answer: C
NEW QUESTION 9
GIven a value, which three options can a developer use to detect if the value is NaN? Choose 3 answers !
- A. value == NaN
- B. Object.is(value, NaN)
- C. value === Number.NaN
- D. value ! == value
- E. Number.isNaN(value)
Answer: AE
NEW QUESTION 10
Why would a developer specify a package.jason as a developed forge instead of a dependency ?
- A. It is required by the application in production.
- B. It is only needed for local development and testing.
- C. Other requiredpackages depend on it for development.
- D. It should be bundled when the package is published.
Answer: B
NEW QUESTION 11
Refer to the code below: Function changeValue(obj) { Obj.value =obj.value/2;
}
Const objA = (value: 10);
Const objB = objA; changeValue(objB); Const result = objA.value;
What is the value of result after the code executes?
- A. 10
- B. Nan
- C. 5
- D. Undefined
Answer: C
NEW QUESTION 12
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 turn around 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. DEBUG = http, https node server.js
- B. NODE_DEBUG =http, https node server.js
- C. DEBUG =true node server.js
- D. NODE_DEBUG =true node server.js
Answer: C
NEW QUESTION 13
Which three actions can be using the JavaScript browser console? Choose 3 answers:
- A. View and change DOM the page.
- B. Display a report showing the performance of a page.
- C. Run code that is not related to page.
- D. view , change, and debug the JavaScript code of the page.
- E. View and change security cookies.
Answer: ACD
NEW QUESTION 14
A developer is required to write a function that calculates the sum of elements in an
array but is getting undefinedevery time the code is executed. The developer needs to find what is missing in the code below.
Const sumFunction = arr => {
Return arr.reduce((result, current) => {
//
Result += current;
//
), 10);
);
Which option makes the code work as expected?
- A. Replace line 02 with return arr.map(( result, current) => (
- B. Replace line 04 with result = result +current;
- C. Replace line 03 with if(arr.length == 0 ) ( return 0; )
- D. Replace line 05 with return result;
Answer: D
NEW QUESTION 15
Refer to code below: console.log(0);
setTimeout(() => ( console.log(1);
});
console.log(2); setTimeout(() => { console.log(3);
), 0);
console.log(4);
In which sequence will the numbers be logged?
- A. 01234
- B. 02431
- C. 02413
- D. 13024
Answer: C
NEW QUESTION 16
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 number in the array, The test passes:
A different developer made changes to the behavior of sum3 to instead sum all of the numbers present in the array. The test passes:
Which two results occur when running the test on the updated sum3 function ? Choose 2 answers
- A. The line 02 assertion passes.
- B. The line 02 assertion fails
- C. The line 05 assertion passes.
- D. The line 05 assertion fails.
Answer: AD
NEW QUESTION 17
Which two console logs outputs NaN? Choose 2 answers
- A. console.log(10/ Number(‘5’));
- B. console.log(parseInt(‘two’));
- C. console.log(10/ ‘’five);
- D. console.log(10/0);
Answer: BC
NEW QUESTION 18
Universal Containers (UC) notices that its application that allows users to search for accounts makes a network request each time a key is pressed. This results in too many requests for the server to handle.
Address this problem, UCdecides to implement a debounce function on string change handler.
What are three key steps to implement this debounce function? Choose 3 answers:
- A. If there is an existing setTimeout and the search string change, allow the existingsetTimeout to finish,and do not enqueue a new setTimeout.
- B. When the search string changes, enqueue the request within a setTimeout.
- C. Ensure that the network request has the property debounce set to true.
- D. If there is an existing setTimeout and the search string changes,cancel the existing setTimeout using the persisted timerId and replace it with a new setTimeout.
- E. Store the timeId of the setTimeout last enqueued by the search string change handle.
Answer: ABC
NEW QUESTION 19
Refer to following code block:
Let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,];
Let output =0;
For (let num of array){ if (output >0){
Break;
}
if(num % 2 == 0){
Continue;
}
Output +=num;
What is the value of output after the code executes?
- A. 16
- B. 36
- C. 11
- D. 25
Answer: A
NEW QUESTION 20
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