최신 JavaScript-Developer-I 무료덤프 - Salesforce Certified JavaScript Developer I

문제1

Refer to the following object:
const cat ={
firstName: 'Fancy',
lastName: ' Whiskers',
Get fullName() {
return this.firstName + ' ' + this.lastName;
}
};
How can a developer access the fullName property for cat?

A. cat.get.fullName

B. cat.fullName()

C. cat.fullName

D. cat.function.fullName()

정답: C

문제2

A developer creates a class that represents a blog post based on the requirement that a Post should have a body author and view count.
The Code shown Below:
Class Post{
// Insert code here
This.body =body
This.author = author;
this.viewCount = viewCount;
}
}
Which statement should be inserted in the placeholder on line 02 to allow for a variable to be set to a new instanceof a Post with the three attributes correctly populated?

A. constructor() {

B. Function Post (body, author, viewCount) {

C. constructor (body, author, viewCount) {

D. super (body, author, viewCount) {

정답: C

문제3

Refer to the code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
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' , {Details : {recordId : '123abc'}}

C. 'Update' , (recordId : '123abc'(

D. 'Update' , '123abc'

정답: B,C

문제4

A team that works on a big project uses npm to deal with projects dependencies.
A developer added a dependency does not get downloaded when they execute npm install.
Which two reasons could be possible explanations for this?
Choose 2 answers

A. The developer added the dependency as a dev dependency, andNODE_ENVIs set to production.

B. The developer missed the option --add when adding the dependency.

C. The developer added the dependency as a dev dependency, andNODE_ENV is set to production.

D. The developer missed the option --save when adding the dependency.

정답: A,C,D

문제5

Which two options are core Node.js modules?
Choose 2 answers

A. http

B. exception

C. worker

D. isotream

정답: A,D

문제6

A developer has the following array of hourly wages:
Let arr = (8, 5, 9, 75, 11, 25, 7, 75, , 13, 25);
For workers making less than $10 an hour rate should be multiple by 1.25 and returned in a new array.
How should the developer implement the request?

A. let arrl = arr.filter((val) => val < 10).map((num) -> num = 1.25);

B. let arrl = arr-map((num) => { return ran * 1.25 }).filter((val) -> { return val < 10));

C. let arrl = arr .rr.acArray ((val) => ( val < 10 )) ,map((num) => { num * 1.25 ));

D. let arrl = arr.filterBy((val) => val < 10 ).aapBy<(num) -> num = ..25 );

정답: B

문제7

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, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.

Which two results occur when running this 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.

정답: B,C

문제8

A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named nag is declared and assigned a value on line 03.

What is the value of msg when getAvailableabilityMessage ("newUserName") is executed and get Availability ("newUserName") returns true?

A. "msg is not defined"

B. "newUserName"

C. "User-name available"

D. undefined

정답: C

문제9

Referto the following code:

Which two statement could be inserted at line 17 to enable the function call on line 18?
Choose 2 answers

A. leo.prototype.roar = ( ) =>( console.log('They\'re pretty good!'); };

B. Object.assign (leo, tony);

C. leo.roar = () => { console.log('They\'re pretty good!'); );

D. Object.assign (leo. Tiger);

정답: B,C

문제10

Refer to the code below:
let timeFunction =() => {
console.log('Timer called.");
};
let timerId = setTimeout (timedFunction, 1000);
Which statement allows a developer to cancel the scheduled timed function?

A. removeTimeout(timedFunction);

B. clearTimeout(timedFunction);

C. removeTimeout(timerId);

D. clearTimeout(timerId);

정답: D

문제11

Whichthree actions can be using the JavaScript browser console?
Choose 3 answers:

A. Run code that is not related to page.

B. Display a report showing the performance of a page.

C. View and change DOM the page.

D. View and change security cookies.

E. view , change, and debug the JavaScript code ofthe page.

정답: A,C,E

문제12

Refer to the code below
let inArray = [[1,2],[3,4,5]];
which two statements results in the array [1,2,3,4,5]?
choose 2 answer

A. [ ].concat.apply([ ],inArray);

B. [ ].concat([...inArray])

C. [ ].concat(...inArray);

D. [ ].concat.apply(inArray,[ ]);

정답: A,C

문제13

Refer to the following array:
Let arr = [ 1,2, 3, 4, 5];
Which three options result in x evaluating as [3, 4, 5] ?
Choose 3 answers.

A. Let x = arr.slice(2,3);

B. Let x= arr.slice(2);

C. Letx= arr.filter((a) => ( return a>2 ));

D. Let x= arr.filter (( a) => (a<2));

E. Let x= arr.splice(2,3);

정답: B,C,E

문제14

A developer uses a parsed JSON string to work with user information as in the block below:
01 const userInformation ={
02 " id " : "user-01",
03 "email" : "[email protected]",
04 "age" : 25
Which two options access the email attribute in the object?
Choose 2 answers

A. userInformation.email

B. userInformation("email")

C. userInformation(email)

D. userInformation.get("email")

정답: A,B

문제15

A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?

A.

B.

C.

D.

정답: A

문제16

A developer needs to test this function:
01const sum3 = (arr) => (
02if (!arr.length) return 0,
03if (arr.length === 1) return arr[0],
04if (arr.length === 2) return arr[0]+ arr[1],
05 return arr[0] + arr[1] + arr[2],
06 );
Which two assert statements are valid tests for the function?
Choose 2 answers

A. console.assert(sum3(0)) == 0);

B. console.assert(sum3(-3, 2 )) == -1);

C. console.assert(sum3(1, '2')) == 12);

D. console.assert(sum3('hello', 2, 3, 4)) === NaN);

정답: B,C

문제17

A developer implements and calls the following code when an application state change occurs:
Const onStateChange =innerPageState) => {
window.history.pushState(newPageState, ' ', null);
}
If the back button is clicked after this method is executed, what can a developer expect?

A. A popstate event is fired with a state property that details the application's last state.

B. A navigate event is fired with a state property that details the previous application state.

C. The page isnavigated away from and the previous page in the browser's history is loaded.

D. The page reloads and all Javascript is reinitialized.

정답: C

문제18

A developer wrote a fizzbuzz function thatwhen passed in a number, returns the following:
'Fizz' if the number is divisible by 3.
'Buzz' if the number is divisible by 5.
'Fizzbuzz' if the number is divisible by both 3 and 5.
Empty string if the number is divisible by neither 3 or 5.
Whichtwo test cases will properly test scenarios for the fizzbuzz function?
Choose 2 answers

A. let res = fizzbuzz(3);console.assert ( res === ' buzz ' )

B. let res = fizzbuzz(Infinity);console.assert ( res === ' ' )

C. let res = fizzbuzz(15);console.assert ( res === ' fizzbuzz ' )

D. let res = fizzbuzz(5);console.assert ( res === ' ' );

정답: A,B,C

최신 JavaScript-Developer-I 무료덤프 - Salesforce Certified JavaScript Developer I

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