CRT-600試験無料問題集（225題）「Salesforce Certified JavaScript Developer I 認定」

出題：1

A developer has the function, shown below, that is called when a page loads.

Where can the developer see the log statement after loading the page in the browser?

A. On the webpage console log

B. On the terminal console running the web server

C. In the browser performance tools log

D. On the browser JavaScript console

正解：D 解答を投票する

出題：2

A developer wants to define a function log to be used a few times on a single-file JavaScript script.
01 // Line 1 replacement
02 console.log('"LOG:', logInput);
03 }
Which two options can correctly replace line 01 and declare the function for use?
Choose 2 answers

A. function leg(logInput) {

B. function log = (logInput) {

C. const log = (logInput) => {

D. const log(loginInput) {

正解：A,C 解答を投票する

出題：3

Refer to the HTML below:

Which JavaScript statement results in changing " The Lion."?

A. document.querySelector('$main li:second-child').innerHTML = " The Lion ';

B. document.querySelectorAll('$main $TONY').innerHTML = '" The Lion

C. document.querySelector('$main li.Tony').innerHTML = '" The Lion ';

D. document.querySelector('$main li:nth-child(2)'),innerHTML = " The Lion. ';

正解：B 解答を投票する

出題：4

Refer to the following object.

How can a developer access the fullName property for dog?

A. Dog, get, fullName

B. Dog, function, fullName

C. Dog.fullName

D. Dog.fullName ( )

正解：C 解答を投票する

出題：5

Which function should a developer use to repeatedly execute code at a fixed interval ?

A. setTimeout

B. setInteria

C. setIntervel

D. setPeriod

正解：C 解答を投票する

出題：6

myArraym can have one level, two levels, or more levels.
Which statement flattens myArray when it can be arbitrarily nested?

A. myArray. join (","). split (",");

B. [ ] .concat {. . .myArray) ;

C. myArray.flat(Infinity);

D. myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);

正解：D 解答を投票する

出題：7

Given the code below:

What is logged to the console'

A. 2 5 1 3 4

B. 2 5 3 4 1

C. 1 2 3 4 5

D. 1 2 5 3 4

正解：B 解答を投票する

出題：8

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

正解：A,D,E 解答を投票する

出題：9

developer publishes a new version of a package with new features 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. 1.2.0

B. 2.0.0

C. 1.1.4

D. 1.2.3

正解：A 解答を投票する

出題：10

Refer to the code below:

What is the result when the Promise in the execute function is rejected?

A. Rejected1 Rejected2 Rejected3 Rejected Rejected Rejected4

B. Rejected

C. Rejected Resolved

D. Resolved1 Resolved2 Resolved3 Resolved4

正解：C 解答を投票する

出題：11

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 missed the option --add when adding the dependency.

B. The developer added the dependency as a dev dependency, and
NODE_ENV
Is set to production.

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

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

正解：B,C,D 解答を投票する

出題：12

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 are used to address this ?
Choose 2 answers

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

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

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

D. Assign variables to the global object.

正解：D 解答を投票する

出題：13

Which two console logs output NaN?
Choose 2 answers | |

A. console.log(parseInt ' ("two')) ;

B. console.loeg(10 / 'five');

C. console.log(10 / 0);

D. console.log(10 / Number('5) ) ;

正解：A,D 解答を投票する

出題：14

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.slice(0, 5);

B. Let arr2 = arr1;

C. Let arr2 = arr1.sort();

D. Let arr2 = Array.from(arr1);

正解：A,D 解答を投票する

出題：15

A developer at Universal Containers is creating their new landing page based 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 Is loaded 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('onload', personalizeWebsiteContent);

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

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

正解：D 解答を投票する

出題：16

Refer to the following code: