Salesforce JavaScript-Developer-I新版題庫上線 & JavaScript-Developer-I題庫資訊

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Browser and DOM Interaction	- Event handling and propagation - Browser APIs (fetch, storage, timers) - DOM manipulation and traversal
JavaScript Language Fundamentals	- Data types, variables, and operators - ES6+ syntax and features - Functions, scope, and closures
Testing and Debugging	- Debugging techniques and tools - Unit testing principles
Salesforce Platform Integration	- Lightning Web Components (LWC) JavaScript usage - Security considerations in Salesforce JavaScript - Calling Apex methods from JavaScript
Asynchronous JavaScript	- Promises and async/await - Event loop and concurrency model - Error handling in async workflows

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最新的 Salesforce Developer JavaScript-Developer-I 免費考試真題 (Q100-Q105):

問題 #100
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?

A)

B)

C)

D)

A. Option A
B. Option D
C. Option C
D. Option B

答案：A

問題 #101
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 = arr1 .slice (0, 5);
B. Let arr2 = arr1;
C. Let arr2 = Array. From (arr1) ;
D. Let arr2 = arr1 sort ();

答案：B,D

問題 #102
Refer to the following code:

What is returned by the function call on line 13?

A. Undefined value.
B. Null value
C. Undefined
D. Line 13 throws an error.

答案：D

問題 #103
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 the developer has, which code logs an error at boost with an event?

A. Try{
server.start();
} catch(error) {
console.log('ERROR', error);
}
B. Server.error ((server) => {
console.log('ERROR', error);
});
C. Server.catch ((server) => {
console.log('ERROR', error);
});
D. Server.on ('error', (error) => {
console.log('ERROR', error);
});

答案：D

問題 #104
Universal Container(UC) just launched a new landing page, but users complain that the
website is slow. A developer found some functions that cause this problem. To verify this, the
developer decides to do everything and log the time each of these three suspicious functions
consumes.
console.time('Performance');
maybeAHeavyFunction();
thisCouldTakeTooLong();
orMaybeThisOne();
console.endTime('Performance');
Which function can the developer use to obtain the time spent by every one of the three
functions?

A. console.timeStamp()
B. console.getTime()
C. console.trace()
D. console.timeLog()

答案：D

問題 #105
......

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