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Salesforce JavaScript-Developer-I Certification Exam is designed for developers who have a strong foundation in JavaScript and are looking to specialize in Salesforce development. JavaScript-Developer-I exam measures the candidate's knowledge of Salesforce development concepts, including Apex, Visualforce, and Lightning Components, as well as their proficiency in JavaScript programming. Salesforce Certified JavaScript Developer (JS-Dev-101) certification is intended to demonstrate the candidate's ability to design, develop and test custom applications on the Salesforce platform.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q142-Q147):

NEW QUESTION # 142
A developer needs to debug a Node.js web server because a runtime error keeps occurring at one of the endpoints.
The developer wants to test the endpoint on a local machine and make the request against a local server to look at the behavior. In the source code, the server.js file will start the server. The developer wants to debug the Node.js server only using the terminal.
Which command can the developer use to open the CLI debugger in their current terminal window?
(With corrected typing errors: node_inspect # node inspect, node_start_inspect # node start inspect.)

A. node start inspect server.js
B. node server.js --inspect
C. node inspect server.js
D. node -i server.js

Answer: C

Explanation:
Node.js includes a built-in command-line (CLI) debugger . To use it directly in the terminal, the standard command is:
node inspect server.js
This:
* Starts server.js under the Node.js inspector.
* Opens the CLI debugger right in the terminal window where you ran the command.
* Lets you interactively:
* Step through code
* Set breakpoints
* Inspect variables
* Continue execution, etc.
Why B is correct:
Option B (corrected to node inspect server.js) is exactly the standard Node.js command to run a script under the CLI debugger in the current terminal.
* It does not rely on any external GUI tools.
* You stay entirely in the terminal to debug.
Why the other options are incorrect:
* A. node start inspect server.js
* There is no start subcommand like this in standard Node.js CLI.
* This is not a valid Node.js debugging command.
* C. node server.js --inspect
* This starts Node.js with the Inspector protocol enabled and is typically used to connect external tools like Chrome DevTools or VS Code.
* It does not open the CLI debugger in the current terminal. Instead, it opens a debugging port that other tools attach to.
* The question specifically says "only using the terminal" and "open the CLI debugger in their current terminal window", which points to node inspect, not --inspect.
* D. node -i server.js
* -i starts Node in interactive REPL mode , optionally after running a script.
* This is for an interactive shell, not the Node debugger.
* It does not provide breakpoint/step/next/continue debugging features like the CLI debugger.
Therefore, the only option that opens the Node.js CLI debugger in the current terminal is:
The answer: B
JavaScript / Node.js knowledge / Study Guide references (concept names only, no links):
* Node.js CLI debugger: node inspect < script >
* Node.js inspector protocol: node --inspect
* Difference between CLI debugger and DevTools-based debugging
* Node.js command-line options and subcommands

NEW QUESTION # 143
Given the following code:
Let x =('15' + 10)*2;
What is the value of a?

A. 0
B. 1
C. 2
D. 3

Answer: B

NEW QUESTION # 144
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array. The test passes:
01 let res = sum3([1, 2, 3]);
02 console.assert(res === 6);
03
04 res = sum3([1, 2, 3, 4]);
05 console.assert(res === 6);
A different developer made changes to the behavior of sum3 to instead sum all of the numbers present in the array.
Which two results occur when running the test on the updated sum3 function?

A. The line 02 assertion fails.
B. The line 05 assertion passes.
C. The line 05 assertion fails.
D. The line 02 assertion passes.

Answer: C,D

Explanation:
New behavior: sum3 now returns the sum of all elements .
* Line 01: sum3([1, 2, 3]) # 1 + 2 + 3 = 6
* Assertion on line 02: res === 6 # passes.
* Line 04: sum3([1, 2, 3, 4]) # 1 + 2 + 3 + 4 = 10
* Assertion on line 05: res === 6 # 10 === 6 is false, so the assertion fails.
So:
* Line 02 assertion passes # D.
* Line 05 assertion fails # C.

NEW QUESTION # 145
Consider type coercion, what does the following expression evaluate to?
True + 3 + '100' + null

A. '3100null'
B. 0
C. 1
D. '4100null'

Answer: D

NEW QUESTION # 146
A developer is trying to handle an error within a function.
Which code segment shows the correct approach to handle an error without propagating it elsewhere?

Answer: D

NEW QUESTION # 147
......

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