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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q54-Q59):

NEW QUESTION # 54
Given the following code:
document.body.addEventListener(' click ', (event) => {
if (/* CODE REPLACEMENT HERE */) {
console.log('button clicked!');
)
});
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?

Answer: B


NEW QUESTION # 55
Given the code below:
01 function Person() {
02 this.firstName = ' John ' ;
03 }
04
05 Person.proto = {
06 job: x = > ' Developer '
07 });
08
09 const myFather = new Person();
10 const result = myFather.firstName + ' ' + myFather.job();
What is the value of result when line 10 executes?

Answer: B

Explanation:
* Person.proto is being set, but JavaScript uses Person.prototype for the prototype chain, not Person.proto.
* Therefore, job is not on Person.prototype, and instances of Person do not have job via prototype.
* myFather is created with new Person(), so:
* myFather.firstName is ' John ' .
* myFather.job is undefined.
Attempting to call myFather.job() results in:
TypeError: myFather.job is not a function
So option A is correct.


NEW QUESTION # 56
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: D


NEW QUESTION # 57
bar, awesome is a popular JavaScript module. the versions publish to npm are:

Teams at Universal Containers use this module in a number of projects. A particular project has the package, json definition below.

A developer runs this command: npm install.
Which version of bar .awesome is installed?

Answer: D


NEW QUESTION # 58
Refer to the code below:

What is the value of result after line 10 executes?

Answer: A


NEW QUESTION # 59
......

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