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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 2	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 3	Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q17-Q22):

NEW QUESTION # 17
Correct implementation of try...catch for countsDeep():

A. setTimeout(function() {
try {
countsDeep();
} catch (e) {
handleError(e);
}
}, 1000);
B. try {
setTimeout(function() {
countSheep();
}, 1000);
} catch (e) {
handleError(e);
}
C. try {
setTimeout(function() {
countsDeep();
}, 1000);
} catch (e) {
handleError(e);
}
D. try {
countsDeep();
} handleError (e){
catch(e);
}

Answer: A

Explanation:
Errors thrown inside a setTimeout callback are asynchronous.
A try...catch around setTimeout (options C and D) can't catch errors thrown inside the callback later.
You must put the try...catch inside the timeout callback (option B).
A is nonsense syntax, D also calls countSheep() instead of countsDeep().

NEW QUESTION # 18
Refer to the following code:

Which statement should be added to line 09 for the code to display. The boat has a capacity of 10 people?

A. super (size);
B. this.size = size;
C. ship.size size;
D. super.size = size;

Answer: B

NEW QUESTION # 19
Refer to the code:
01 const exec = (item, delay) =>
02 new Promise(resolve => setTimeout(() => resolve(item), delay));
03
04 async function runParallel() {
05 const [result1, result2, result3] = await Promise.all(
06 [exec('x', '100'), exec('y', '500'), exec('z', '100')]
07 );
08 return `parallel is done: ${result1}${result2}${result3}`;
09 }
Which two statements correctly execute runParallel()?

A. runParallel().then(function(data){
return data;
});
B. async runParallel().then(data);
C. runParallel().done(function(data){
return data;
});
D. runParallel().then(data);

Answer: A,D

Explanation:
Facts about JavaScript Promises:
runParallel() is declared async, which means it always returns a Promise.
Promises are consumed using .then(), .catch(), and .finally().
There is no .done() method in native JavaScript Promises.
The async keyword cannot be placed before a function call (option A is invalid syntax).
Analysis of each option:
A . async runParallel().then(data);
Invalid syntax. async cannot prefix an expression.
B . Valid. Calls the function and attaches a .then() handler.
C . Invalid. .done() is not part of JavaScript Promise API.
D . Valid. Calls runParallel() and chains .then().
Therefore the correct answers are B and D.
JavaScript Knowledge Reference (text-only)
async functions return Promises.
Promises use .then() to retrieve resolved values.
.done() is not part of the standard Promise interface.

NEW QUESTION # 20
01 let a = "*";
02 let b = "**";
/ 7 x = 3;
04 console.log(a);
What is displayed when the code executes?

A. undefined
B. a
C. ReferenceError: a is not defined
D. null

Answer: A

NEW QUESTION # 21
Which two options are core Node.js modules?
Choose 2 answers

A. isotream
B. worker
C. exception
D. http

Answer: A,D

NEW QUESTION # 22
......

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