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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Topic 1: Asynchronous JavaScript	- Promises and async/await - Event loop and concurrency model - Error handling in async workflows
Topic 2: Browser and DOM Interaction	- DOM manipulation and traversal - Event handling and propagation - Browser APIs (fetch, storage, timers)
Topic 3: Salesforce Platform Integration	- Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript - Security considerations in Salesforce JavaScript
Topic 4: JavaScript Language Fundamentals	- Data types, variables, and operators - Functions, scope, and closures - ES6+ syntax and features
Topic 5: Testing and Debugging	- Unit testing principles - Debugging techniques and tools

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q141-Q146):

NEW QUESTION # 141
Refer to the following code that imports a module named utils:
import (foo, bar) from '/path/Utils.js';
foo() ;
bar() ;
Which two implementations of Utils.js export foo and bar such that the code above runs without
error?
Choose 2 answers

A. // FooUtils.js and BarUtils.js exist
Import (foo) from '/path/FooUtils.js';
Import (boo) from ' /path/NarUtils.js';
B. const foo = () => { return 'foo' ; }
const bar = () => { return 'bar' ; }
export { bar, foo }
C. Export default class {
foo() { return 'foo' ; }
bar() { return 'bar' ; }
}
D. const foo = () => { return 'foo';}
const bar = () => {return 'bar'; }
Export default foo, bar;

Answer: B,C

NEW QUESTION # 142
Given the following code:
Let x = ('15' +10) +2;
What is the value of x?

A. 0
B. 1
C. 2
D. 3

Answer: B

NEW QUESTION # 143
What is the result of the code block?

A. The console logs 'flag' and then an error is thrown.
B. An error is thrown.
C. The console logs 'flag' and another flag.
D. The console logs only 'flag'.

Answer: A

NEW QUESTION # 144
Refer to the code below:
01 new Promise((resolve, reject) = > {
02 const fraction = Math.random();
03 if (fraction > 0.5) reject( ' fraction > 0.5, ' + fraction);
04 resolve(fraction);
05 })
06 .then(() = > console.log( ' resolved ' ))
07 .catch((error) = > console.error(error))
08 .finally(() = > console.log( ' when am I called? ' ));
When does Promise.finally on line 08 get called?

A. When resolved
B. When rejected
C. When resolved or rejected
D. When resolved and settled

Answer: C

Explanation:
Behavior of Promise.prototype.finally:
* .finally(handler) registers a callback that runs when the promise is settled , meaning:
* Either fulfilled (resolved) , or
* rejected .
Important points:
* The finally callback does not receive the promise's value or error (unlike then and catch).
* It is executed after the promise is settled, but before the resolution value or rejection reason is passed further down the chain.
* It runs in both success and failure paths.
In the given code:
* The promise may either:
* Call reject( ' fraction > 0.5, ' + fraction) if fraction > 0.5, or
* Call resolve(fraction) otherwise.
In both cases:
* If it resolves , .then(() = > console.log( ' resolved ' )) runs, and then .finally(...) is executed.
* If it rejects , .catch((error) = > console.error(error)) runs, and then .finally(...) is executed.
So .finally runs:
* Not just "when rejected".
* Not just "when resolved".
* But whenever the promise is resolved or rejected .
Therefore, the correct choice is:
* D. When resolved or rejected .

NEW QUESTION # 145
Refer to the code below:
Const myFunction = arr => {
Return arr.reduce((result, current) =>{
Return result = current;
}, 10};
}
What is the output of this function when called with an empty array ?

A. Returns 10
B. Throws an error
C. Returns NaN
D. Returns 0

Answer: A

NEW QUESTION # 146
......

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