Valid Salesforce JS-Dev-101 Questions: 100% Authentic [2026]

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	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 2	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 3	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q109-Q114):

NEW QUESTION # 109
developer is trying to convince management that their team will benefit from using Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the teamhas already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Choose 3 answers:

A. Executes server-side JavaScript code to avoid learning a new language.
B. Ensures stabilitywith one major release every few years.
C. Uses non-blocking functionality for performant requesthandling .
D. Installs with its own package manager to install and manage third-party libraries.
E. Performs a static analysis on code before execution to look for runtime errors.

Answer: C,D,E

NEW QUESTION # 110
Given the followingcode, what is the value of x?
let x = '15' + (10 * 2);

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

Answer: C

NEW QUESTION # 111
Which option istrue about the strict mode in imported modules?

A. Add the statement use non-strict, before any other statements in the module to enablenot-strict mode.
B. Imported modules are in strict mode whether you declare them as such or not.
C. Add the statement use strict =false; before any other statements in the module to enablenot- strict mode.
D. You can only reference notStrict() functions from the imported module.

Answer: B

NEW QUESTION # 112
A class was written to represent items for purchase in an online store, and a second class representing items that are on sale at a discounted price. The constructor sets the name to the first value passed in. There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem.
01 let regItem = new Item('Scarf', 55);
02 let saleItem = new SaleItem('Shirt', 80, .1);
03 Item.prototype.description = function() { return 'This is a ' + this.name; }
04 console.log(regItem.description());
05 console.log(saleItem.description());
06
07 SaleItem.prototype.description = function() { return 'This is a discounted ' + this.name; } What is the output when executing the code above?

A. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is a Shirt
This is a discounted Shirt
B. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt
C. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is a Scarf
This is a discounted Shirt
D. This is a Scarf
This is a Shirt
This is a discounted Scarf
This is a discounted Shirt

Answer: B

Explanation:
Comprehensive and Detailed
Assuming SaleItem inherits from Item via prototype (e.g. SaleItem.prototype = Object.create(Item.prototype)):
Lines 01-02: create regItem and saleItem.
Line 03: define Item.prototype.description.
Now both regItem and saleItem (via inheritance) have a description method from Item.prototype.
Line 04: regItem.description() → 'This is a Scarf'.
Line 05: saleItem.description() → 'This is a Shirt' (same method, but this.name is 'Shirt').
Line 07: SaleItem.prototype.description = ... overrides description only for SaleItem instances going forward.
If we imagine calling regItem.description() and saleItem.description() again after line 07:
regItem.description() still uses Item.prototype.description → 'This is a Scarf'.
saleItem.description() now uses SaleItem.prototype.description → 'This is a discounted Shirt'.
Those four lines correspond to option B.
________________________________________

NEW QUESTION # 113
Refer to the code below:
01 let timedFunction = () => {
02 console.log('Timer called.');
03 };
04
05 let timerId = setInterval(timedFunction, 1000);
Which statement allows a developer to cancel the scheduled timed function?

A. removeInterval(timedFunction);
B. removeInterval(timerId);
C. clearInterval(timedFunction);
D. clearInterval(timerId);

Answer: D

Explanation:
Comprehensive and Detailed Explanation From JavaScript Knowledge:
The code:
let timerId = setInterval(timedFunction, 1000);
setInterval schedules timedFunction to run every 1000 ms.
It returns an interval ID (here stored in timerId), which is used to cancel the interval later.
To cancel:
Use clearInterval(timerId);
This is the standard browser (and Node.js) API:
let id = setInterval(fn, delay);
clearInterval(id); stops future executions of that interval.
Check other options:
B . removeInterval(timerId);
There is no removeInterval function in the standard JavaScript timer API.
C . removeInterval(timedFunction);
Again, no such function; and timers are cancelled by ID, not by the callback function reference.
D . clearInterval(timedFunction);
clearInterval expects the ID returned by setInterval, not the callback function.
Passing the function does not cancel the timer.
Therefore, the correct statement is:
Answe r: A
Study Guide / Concept Reference (no links):
Timer APIs: setInterval and clearInterval
Relationship between timer ID and cancellation
Difference between interval ID and callback function
Basic async timing patterns in JavaScript

NEW QUESTION # 114
......

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