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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 2	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 3	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 4	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 5	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q130-Q135):

NEW QUESTION # 130
Why would a developerspecify a package.jason as a developed forge instead of a dependency ?

A. It should be bundled when the package is published.
B. It is required by the application in production.
C. Other required packages depend on it for development.
D. It is only needed for local development and testing.

Answer: D

NEW QUESTION # 131
A developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning formats, what should the new package version number be?

A. 1.2.3
B. 1.1.4
C. 1.2.0
D. 2.0.0

Answer: C

Explanation:
The correct answer is D.
Semantic versioning usually follows this format:
MAJOR.MINOR.PATCH
For the version:
1.1.3
The parts are:
1 = MAJOR
1 = MINOR
3 = PATCH
A package version should be updated based on the type of change:
MAJOR version changes when there are breaking changes.
MINOR version changes when new features are added in a backward-compatible way.
PATCH version changes when backward-compatible bug fixes are added.
The question says the developer added new features that do not break backward compatibility. That means the minor version should increase.
Starting version:
1.1.3
Increase the minor version from 1 to 2, and reset the patch version to 0:
1.2.0
Why the other options are incorrect:
A . 1.2.3 is incorrect because when the minor version increases, the patch version should reset to 0.
B . 1.1.4 is incorrect because that would represent a patch update, usually for bug fixes, not new features.
C . 2.0.0 is incorrect because that would represent a major version update, usually for breaking changes.
D . 1.2.0 is correct because it represents a backward-compatible feature release.
Therefore, the verified answe r is D.

NEW QUESTION # 132
Refer the code below.
x=3.14;
function myfunction() {
"use strict";
y=x;
}
z=x;
myFunction();

Answer:

Explanation:
See the Answer below in explanation

NEW QUESTION # 133
A Node.js server library uses events and callbacks. The developer wants to log any issues the server has at boot time.
Which code logs an error with an event?

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

Answer: A

Explanation:
console.log('ERROR', error);
}
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Node.js event-based modules use the EventEmitter pattern.
The correct syntax for listening to events is:
emitter.on('eventName', callback)
The server library emits an 'error' event, which must be listened to using .on.
Option analysis:
A: .catch is for Promises, not EventEmitters.
B: .error is not an EventEmitter method.
C: Correct. Listens to the 'error' event.
D: try...catch only captures synchronous errors, not event-based asynchronous errors.
Therefore, the correct answer is option C.
________________________________________
JavaScript Knowledge Reference (text-only)
The EventEmitter API uses on(event, handler) to listen for events.
Errors emitted asynchronously cannot be caught with try...catch.
The 'error' event is standard for Node.js modules to signal operational errors.

NEW QUESTION # 134
A developer wants to use a module named universalContainerslib and then call functions from it. How should a developer import every function from the module and then call the functions foo and bar?

A. import * from '/path/universalContainerslib.js';
universalContainerslib.foo();
universalContainerslib.bar();
B. import {foo, bar} from '/path/universalContainerslib.js';
foo();
bar();
C. import * as lib from '/path/universalContainerslib.js';
lib.foo();
lib.bar();
D. import all from '/path/universalContainerslib.js';
universalContainerslib.foo();
universalContainerslib.bar();

Answer: C

Explanation:
import * as lib from '...' imports all named exports from the module into the namespace object lib.
You then call:
lib.foo();
lib.bar();
Option D correctly imports only foo and bar, not every function. The question explicitly says "import every function... and then call foo and bar", so A best matches.
Options B and C are invalid syntax or reference the wrong identifier.
________________________________________

NEW QUESTION # 135
......

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