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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Exam Price: | $200 USD |
| Related Certifications: | Lightning Web Components Specialist Superbadge Salesforce Certified JavaScript Developer I |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Exam Duration: | 105 minutes |
| Exam Format: | Multiple Choice, Multiple Select |
| Available Languages: | English |
| Passing Score: | 65% |
| Certificate Validity Period: | Lifetime (No renewal required) |
| Sample Questions: | Salesforce JS-Dev-101 Sample Questions |
| Exam Way: | Online (Proctored) |
| Pre Condition: | Completion of the Lightning Web Components Specialist Superbadge is required to earn the full credential, though it can be completed before or after the exam. |
| Official Syllabus URL: | https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi |
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NEW QUESTION # 44
A developer is leading the creation of a new browser application that will serve a single page application. The team wants to use a new web framework Minimalsit.js.The Lead developer wants to advocate for a more seasoned web framework that already has a community around it.
Which two frameworks should the lead developer advocate for?
Choose 2 answers
Answer: A,D
NEW QUESTION # 45
Refer to the code below:
01 <html lang="en">
02 <table onclick="console.log('Table log');">
03 <tr id="row1">
04 <td>Click me!</td>
05 </tr>
06 </table>
07 <script>
08 function printMessage(event) {
09 console.log('Row log');
10 event.stopPropagation();
11 }
12
13 let elem = document.getElementById('row1');
14 elem.addEventListener('click', printMessage, false);
15 </script>
16 </html>
Which code change should be done for the console to log the following when "Click me!" is clicked?
Row log
Table log
Answer: D
Explanation:
Current behavior:
Clicking <td> triggers the click event on row1, then bubbles up to <table>.
printMessage runs, logs "Row log", then event.stopPropagation() stops the event from bubbling to the table.
So "Table log" never appears.
To allow the table's inline onclick to run after the row handler:
Remove the propagation stop:
function printMessage(event) {
console.log('Row log');
// event.stopPropagation(); // remove this
}
Now the event bubbles:
printMessage logs "Row log".
The table's onclick runs, logging "Table log".
Option A only changes capture/bubble phase but still stops propagation. C does nothing meaningful (stopPropagation takes no arguments). B removes the row handler entirely.
________________________________________
NEW QUESTION # 46
Which option is true about the strict mode in imported modules?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
In JavaScript, ES modules (files imported using import / export) have special semantics:
All code inside a module is automatically executed in strict mode.
This is specified by the ECMAScript standard and does not require the explicit "use strict"; directive.
Effects:
You do not need to write "use strict"; at the top of a module file.
You cannot turn strict mode off for module code.
All module top-level code is treated as strict.
Now evaluate each option:
Option A:
Add the statement use non-strict; before any other statements in the module to enable notstrict mode.
There is no use non-strict; directive in JavaScript.
The only directive recognized by engines is "use strict";.
You cannot explicitly enable a "non-strict" mode with such a string.
Option B:
Imported modules are in strict mode whether you declare them as such or not.
This matches the language specification.
ES modules are always in strict mode, automatically.
This is true.
Option C:
Add the statement use strict = false; before any other statements in the module to enable notstrict mode.
use strict = false; is not a directive; it is parsed as a normal expression, and does not affect strict mode.
There is no supported way to disable strict mode in modules.
Option D:
A developer can only reference notStrict() functions from the imported module.
There is no special notStrict() restriction in modules.
Functions exported/imported in modules are simply subject to strict mode rules like the rest of the module's code.
Therefore, the only correct statement is:
Study Guide / Concept Reference (no links):
ES modules (import / export)
Automatic strict mode in modules
"use strict"; directive for scripts vs modules
Inability to disable strict mode in ES module code
________________________________________
NEW QUESTION # 47
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
Answer: D
NEW QUESTION # 48
Refer to the code below:
01 const server = require('server');
02
03 // Insert code here
A developer imports a library that creates a web server. The imported library uses events and callbacks to start the server.
Which code should be inserted at line 03 to set up an event and start the web server?
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
The question specifies:
The library "uses events and callbacks to start the server".
We want to "set up an event and start the web server".
Option C:
server((port) => { console.log('Listening on', port); });
This:
Calls server(...), which (by design in such libraries) typically starts the web server.
Passes a callback function that receives port when the server is ready.
Inside the callback, it logs "Listening on <port>".
This matches the "events and callbacks" description: the callback is invoked when the server has started listening.
Why others are incorrect:
A . server.on('connect', ...)
Assumes server is an event emitter instance with a 'connect' event, which is not given. Also, this line alone would not start the server.
B . server.start();
Assumes a start method exists; the question says the library "uses events and callbacks to start," implying invocation with a callback, not a plain start() call.
D . server();
Might start the server, but does not "set up an event" or callback to know when or where it is listening.
Therefore, C aligns with the described usage.
Concepts: callback-based APIs, starting servers with callbacks, event/callback style vs simple method calls.
NEW QUESTION # 49
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