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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	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 3	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 4	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 5	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 6	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 (Q126-Q131):

NEW QUESTION # 126
Value of true + 3 + '100' + null:

A. "2200null"
B. 0
C. "4100null"
D. "4100"

Answer: C

NEW QUESTION # 127
A developer has a fizzbuzz function that, when passed in a number, returns the following:
- 'fizz' if the number is divisible by 3.
- 'buzz' if the number is divisible by 5.
- 'fizzbuzz' if the number is divisible by both 3 and 5.
- empty string if the number is divisible by neither 3 or 5.
Which two test cases properly test scenarios for the fizzbuzz function?
Choose 2 answers

A. let res = fizzbuzz(NaN);
console.assert(isNaN(res));
B. let res = fizzbuzz(15);
console.assert(res === 'fizzbuzz');
C. let res = fizzbuzz(Infinity);
console.assert(res === '');
D. let res = fizzbuzz(3);
console.assert(res === 'buzz');

Answer: B,C

NEW QUESTION # 128
Considering type coercion, what does the following expression evaluate to?
True + '13' + NaN

A. ' 113Nan '
B. ' true13 '
C. 0
D. ' true13NaN '

Answer: D

NEW QUESTION # 129
A developer needs to test this function:
01const sum3 = (arr) => (
02if (!arr.length) return 0,
03if (arr.length === 1) return arr[0],
04if (arr.length === 2) return arr[0]+ arr[1],
05 return arr[0] + arr[1] + arr[2],
06 );
Which two assert statements are valid tests for the function?
Choose 2 answers

A. console.assert(sum3(1, '2')) == 12);
B. console.assert(sum3(0)) == 0);
C. console.assert(sum3('hello', 2, 3, 4)) === NaN);
D. console.assert(sum3(-3, 2 )) == -1);

Answer: A,D

NEW QUESTION # 130
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
- Will establish a web socket connection and handle receipt of messages to the server
- Will be imported with `require`, and made available with a variable called `ws`.
The developer also wants to add error logging if a connection fails.
Given this information, which code segment shows the correct way to set up a client with two events that listen at execution time?

A. ws.on('connect', () => {
console.log('Connected to client');
});
ws.on('error', (error) => {
console.log('ERROR', error);
});
B. ws.on('connect', () => {
console.log('Connected to client');
});
ws.on('error', (error) => {
console.log('ERROR', error);
});
C. ws.connect(() => {
console.log('Connected to client');
}).catch((error) => {
console.log('ERROR', error);
});
D. try {
ws.connect(() => {
console.log('Connected to client');
});
} catch(error) {
console.log('ERROR', error);

Answer: A,B

Explanation:
}

NEW QUESTION # 131
......

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