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

문제1

Refer the code below.
x=3.14;
function myfunction() {
"use strict";
y=x;
}
z=x;
myFunction();

정답:

Z is equal to 3.14
Use strict has effect only on line 5.
Line 5 throws an error

문제2

Refer to the followingcode:

A. Inner message
Outer message

B. Outer message

C. Outer message
Inner message

D. Button message

정답: D

문제3

In the browser, the window object is often used to assign variables that require the broadest scope in an application Node.js application does not have access to the window object by default.
Which two methods areused to address this ?
Choose 2 answers

A. Create a new window object in the root file.

B. Assign variables to module.exports and require them as needed.

C. Use the document object instead of the window object.

D. Assign variables to the global object.

정답: D

문제4

developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information thedeveloper has, which code logs an error at boost with an event?

A. Try{server.start();} catch(error) {console.log('ERROR', error);}

B. Server.catch ((server) => {console.log('ERROR', error);});

C. Server.on ('error', (error) => {console.log('ERROR', error);});

D. Server.error ((server) => {console.log('ERROR', error);});

정답: C

문제5

A developer wants to create an object from a function in the browser using the code below.

What happens due to the lack of the mm keyword on line 02?

A. The m variable is assigned the correct object but this.name remains undefined.

B. window.m Is assigned the correct object.

C. window.name is assigned to 'hello' and the variable = remains undefined.

D. The m variable is assigned the correct object.

정답: C

문제6

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

문제7

The developer wants to test the array shown:
const arr = Array(5).fill(0)
Which two tests are the most accurate for this array ?
Choose 2 answers:

A. console.assert(arr[0] === 0 && arr[ arr.length] === 0);

B. console.assert( arr.length === 5 );

C. arr.forEach(elem => console.assert(elem === 0)) ;

D. console.assert (arr.length >0);

정답: B,C

문제8

Refer to the code below:
Let foodMenu1 = ['pizza', 'burger', 'French fries'];
Let finalMenu = foodMenu1;
finalMenu.push('Garlic bread');
What is the value of foodMenu1 after the code executes?

A. [ 'pizza','Burger', 'French fires']

B. [ 'Garlic bread' , 'pizza','Burger', 'French fires' ]

C. [ 'pizza','Burger', 'French fires', 'Garlic bread']

D. [ 'Garlicbread']

정답: A

문제9

A developer at Universal Containers is creating their new landing pagebased on HTML, CSS, and JavaScript.
The website includes multiple external resources that are loaded when the page is opened.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed when the webpage isloaded and there is no need to wait for the resources to be available.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?

A. windows,addEventListener('onDOMCContentLoaded', personalizeWebsiteContent);

B. windows,addEventListener('load', personalizeWebsiteContent);

C. windows,addEventListener('onload', personalizeWebsiteContent);

D. windows,addEventListener('DOMContent Loaded ', personalizeWebsiteContent);

정답: B

문제10

Given the code below:
FunctionmyFunction(){
A =5;
Var b =1;
}
myFunction();
console.log(a);
console.log(b);
What is the expected output?

A. Line 08thrones an error, therefore line 09 is never executed.

B. Both lines 08 and 09 are executed, and the variables are outputted.

C. Both lines 08 and 09 are executed, but values outputted are undefined.

D. Line 08 outputs the variable, but line 09 throws an error.

정답: D

문제11

Which statement can a developer apply to increment the browser's navigation history without a page refresh?

A. window.history.pushStare(newStateObject, ' ', null);

B. window.history.replaceState(newStateObject,'', null);

C. window.history.pushState(newStateObject);

D. window.history.state.push(newStateObject);

정답: B

문제12

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

A. let x =arr.splice(0, 2);

B. let x arr.filter((a) => (return a <= 2 });

C. let x = arr.filter ((a) => 2 }) ;

D. let x = arr. slice (2);

E. let x = arr. slice (0, 2);

정답: A,B,E

문제13

Which three browser specific APIs are available for developers to persist data between page loads ?
Choose 3 answers

A. localStorage.

B. Global variables

C. IIFEs

D. Cookies

E. indexedDB

정답: A,C,E

문제14

Refer to the code below:

Line 05 causes an error.
What are the values of greeting and salutation once code completes?

A. Greeting is Goodbye and salutation is I say Hello.

B. Greeting is Hello and salutation is Hello, Hello.

C. Greeting is Hello and salutation is I say hello.

D. Greeting is Goodbye and salutation is Hello, Hello.

정답: B

문제15

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

문제16

Refer tothe code below:

What is the value of result after line 10 executes?

A. undefined Developer

B. John Developer

C. John undefined

D. Error: myFather.job is not a function

정답: B

문제17

Given the code below:
Setcurrent URL ();
console.log('The current URL is: ' +url );
functionsetCurrentUrl() {
Url = window.location.href:
What happens when the code executes?

A. The url variable has local scope and line 02 throws an error.

B. The url variable has global scope and line 02 throws an error.

C. The url variable has local scope and line 02 executes correctly.

D. The url variable has global scope and line 02 executes correctly.

정답: D

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

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