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| Section | Objectives |
|---|---|
| Topic 1: Salesforce Platform Integration | - Lightning Web Components (LWC) JavaScript usage - Security considerations in Salesforce JavaScript - Calling Apex methods from JavaScript |
| Topic 2: Browser and DOM Interaction | - Browser APIs (fetch, storage, timers) - Event handling and propagation - DOM manipulation and traversal |
| Topic 3: JavaScript Language Fundamentals | - ES6+ syntax and features - Data types, variables, and operators - Functions, scope, and closures |
| Topic 4: Testing and Debugging | - Unit testing principles - Debugging techniques and tools |
| Topic 5: Asynchronous JavaScript | - Error handling in async workflows - Promises and async/await - Event loop and concurrency model |
>> JavaScript-Developer-I Practice Mock <<
The Salesforce Certified JavaScript Developer (JS-Dev-101) (JavaScript-Developer-I) certification exam is one of the hottest and most industrial-recognized credentials that has been inspiring beginners and experienced professionals since its beginning. With the JavaScript-Developer-I certification exam successful candidates can gain a range of benefits which include career advancement, higher earning potential, industrial recognition of skills and job security, and more career personal and professional growth.
NEW QUESTION # 119
A developer has an isDeg function that takes one argument, pts. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?
Answer: B
Explanation:
* setInterval(fn, delay, arg1, arg2, ...) calls fn every delay ms, passing extra arguments.
* To call isDeg every 60 seconds with " cat " :
setInterval(isDeg, 60000, ' cat ' );
Why others are wrong:
* A/D: isDeg( ' cat ' ) is called immediately, and its return value is scheduled, not the function.
* C: setTimeout runs once after 60 seconds, not repeatedly.
NEW QUESTION # 120
A developer is trying to handle an error within a function.
Which code segment shows the correct approach to handle an error without propagating it elsewhere?
Answer: A
NEW QUESTION # 121
Refer to the code below:
01 const objBook = {
02 title: ' JavaScript ' ,
03 };
04 Object.preventExtensions(objBook);
05 const newObjBook = objBook;
06 newObjBook.author = ' Robert ' ;
What are the values of objBook and newObjBook respectively?
Answer: B
Explanation:
* Object.preventExtensions(obj) This built-in JavaScript method marks an object so that no new properties can be added to it. Existing properties can still be read and updated, but adding new ones is disallowed.
* const newObjBook = objBook; Both variables reference the same object in memory. JavaScript objects are assigned by reference, not copied.
* newObjBook.author = " Robert " ; Because the object has been marked as non-extensible, JavaScript will not allow new properties to be added. The behavior depends on mode:
* In non-strict mode: the assignment silently fails and does nothing.
* In strict mode: this would throw a TypeError.
Since nothing indicates strict mode, this is non-strict behavior, making the assignment fail silently.
Therefore, the object remains:
{ title: " JavaScript " }
Both objBook and newObjBook point to the same unchanged object.
This matches option A.
JavaScript knowledge references (text-only)
* Object.preventExtensions() prevents adding new properties.
* Assigning an object to another variable copies the reference, not the object.
* Adding a property to a non-extensible object silently fails in non-strict mode.
NEW QUESTION # 122
A 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 turnaround 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?
Answer: D
NEW QUESTION # 123
A developer is setting up a Node,js server and is creating a script at the root of the source code, index,js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.
Which global variable can be used in the script?
Answer: A
NEW QUESTION # 124
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