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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 2	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 3	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 4	Variables, Types, and Collections: Covers declaring and initializing variables, working with strings, numbers, dates, arrays, and JSON, along with understanding type coercion and truthy falsy evaluations.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q26-Q31):

NEW QUESTION # 26
Refer to the code below:
flag();
function flag() {
console.log('flag');
}
const anotherFlag = () => {
console.log('another flag');
}
anotherFlag();
What is result of the code block?

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

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Key points:
Function declarations are hoisted (their definitions are available before the line where they appear).
Function expressions assigned to const or let are not hoisted as callable functions, but here anotherFlag is only used after it is defined.
Step-by-step:
flag(); at the top:
flag is a function declaration defined later; due to hoisting, it is available.
It logs 'flag'.
The declaration:
function flag() {
console.log('flag');
}
is already in effect (hoisted before execution).
const anotherFlag = () => { console.log('another flag'); } defines anotherFlag as an arrow function.
anotherFlag(); is called after its definition; this is valid and logs 'another flag'.
No errors occur. The console output is:
flag
another flag
So option D is correct.
Concepts: function hoisting, difference between function declarations and function expressions, execution order.

NEW QUESTION # 27
A 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.
Which code logs an error at boot time with an event?

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

Answer: B

Explanation:
Event-driven Node-style APIs expose events via .on(eventName, handler).
To listen for error events:
server.on('error', (error) => {
console.log('ERROR', error);
});
A and B assume methods .error or .catch that don't exist on typical event emitters.
C only catches synchronous errors from server.start(), not async event-based errors.
________________________________________

NEW QUESTION # 28
Refer to the following code:
function test (val) {
If (val === undefined) {
return 'Undefined values!' ;
}
if (val === null) {
return 'Null value! ';
}
return val;
}
Let x;
test(x);
What is returned by the function call on line 13?

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

Answer: C

NEW QUESTION # 29
Refer to the code below:
function changeValue(param) {
Param =5;
}
Let a =10;
Let b =5;
changeValue(b);
Const result = a+ " - "+ b;
What is the value of result when code executes?

A. 10 - 5
B. 10 -10
C. 5 -5
D. 5 - 10

Answer: B

NEW QUESTION # 30
Which three options show valid methods for creating a fat arrow function?
Choose 3 answers

A. ( ) => ( console.log(' executed ') ;)
B. x => ( console.log(' executed ') ; )
C. (x,y,z) => ( console.log(' executed ') ;)
D. X,y,z => ( console.log(' executed ') ;)
E. [ ] => ( console.log(' executed ') ;)

Answer: B,C

NEW QUESTION # 31
......

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