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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	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.
Topic 4	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 (Q135-Q140):

NEW QUESTION # 135
A developer needs the function personalizeWebsiteContent to run when the webpage is fully loaded (HTML and all external resources).
Which implementation should be used?

A. Add a handler to the personalizeWebsiteContent script to handle the DOMContentLoaded event
B. Add a listener to the window object to handle the DOMContentLoaded event
C. Add a listener to the window object to handle the load event
D. Add a handler to the personalizeWebsiteContent script to handle the load event

Answer: C

Explanation:
JavaScript defines two main page-loading events:
DOMContentLoaded
Fires when the HTML document has been completely parsed.
External resources like images, stylesheets, iframe contents, etc. may not be loaded yet.
load event on window
Fires when:
HTML is fully parsed
All dependent resources (images, scripts, CSS, fonts, etc.) are fully loaded The requirement states:
"when the webpage is fully loaded (HTML content and all related files)" This aligns exactly with the window load event.
Implementation:
window.addEventListener("load", personalizeWebsiteContent);
This matches option B.
JavaScript knowledge references (text-only)
DOMContentLoaded fires after HTML parsing only.
load fires after all page resources finish loading.
The window object is the correct target for listening to the full load event.

NEW QUESTION # 136
Refer to the code below?
Let searchString = ' look for this ';
Which two options remove the whitespace from the beginning of searchString?
Choose 2 answers

A. searchString.trimEnd();
B. searchString.trimStart();
C. searchString.replace(/*ss*/, '');
D. trimStart(searchString);

Answer: B,C

NEW QUESTION # 137
Refer to the code below:
01 const server = require('server');
02 /* Insert code here */
A developer imports a library that creates a web server. Theimported library uses events and callbacks to start the servers Which code should be inserted at the line 03 to set up an event and start the web server ?

A. Server.start ();
B. server()
C. serve(( port) => (
D. server.on(' connect ' , ( port) => {console.log('Listening on ' , port) ;})
E. console.log( 'Listening on ', port) ;

Answer: D

NEW QUESTION # 138
A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed to do some custom initialization when the webpage is fully loaded with HTML content and all related files.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?

A. window.addEventListener('load', personalizeWebsiteContent);
B. document.addEventListener('DOMContentLoaded', personalizeWebsiteContent);
C. document.addEventListener('onDOMContentLoaded', personalizeWebsiteContent);
D. window.addEventListener('onload', personalizeWebsiteContent);

Answer: A

Explanation:
Two key browser events:
DOMContentLoaded (fired on document):
Fired when the HTML document has been completely loaded and parsed, without waiting for stylesheets, images, and subresources to finish loading.
load (fired on window):
Fired when the entire page is fully loaded, including all dependent resources such as stylesheets and images.
The requirement states:
"... when the webpage is fully loaded with HTML content and all related files." That matches the semantics of the load event on the window object.
So the correct code is:
window.addEventListener('load', personalizeWebsiteContent);
Why others are incorrect:
A: DOMContentLoaded fires earlier, when HTML is parsed, but before all related files (images, some styles, etc.) are guaranteed to be loaded.
B: 'onDOMContentLoaded' is not a valid event name; the event is 'DOMContentLoaded'.
D: When using addEventListener, the event type is 'load', not 'onload'. 'onload' is the name of the handler property (window.onload = ...), not the event string.
Relevant concepts: window.load event, DOMContentLoaded, addEventListener syntax, page load lifecycle.

NEW QUESTION # 139
refer to the exhibit.

Which code change should be done for the console to log the following when 'Click me!' is clicked' > Row log > Table log

A. Remove lines 13 and14
B. Change line 10 to event.stopPropagation (false) ;
C. Remove line 10
D. Change line 14 to elem.addEventListener ('click', printMessage, true);

Answer: C

NEW QUESTION # 140
......

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JS-Dev-101 New Dumps Free & Latest JS-Dev-101 Exam Discount

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Salesforce JS-Dev-101 Exam Syllabus Topics:

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q135-Q140):

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