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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	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
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	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q133-Q138):

NEW QUESTION # 133
Refer to the code:
01 console.log('Start');
02 Promise.resolve('Success').then(function(value) {
03 console.log('Success');
04 });
05 console.log('End');
What is the output after the code executes successfully?

A. Success
Start
End
B. Start
End
Success
C. Start
Success
End
D. End
Start
Success

Answer: B

Explanation:
console.log('Start') runs immediately (synchronous).
Promise.resolve().then(...) places the callback in the microtask queue. The .then handler does not run immediately.
console.log('End') runs next (still synchronous).
After the synchronous script finishes, the microtask queue runs, logging "Success".
Execution order:
Start
End
Success
This matches option B.
JavaScript Knowledge Reference (text-only)
Promise .then() callbacks execute after the current call stack finishes (microtask queue).
Synchronous logs run immediately, before promise callbacks.

NEW QUESTION # 134
A team at Universal Containers works on a big project and uses yarn to manage the project's dependencies.
A developer added a dependency to manipulate dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get downloaded when they execute yarn.
What could be the reason for this?

A. The developer added the dependency as a dev dependency, and YARN_ENV is set to production.
B. The developer missed the option --add when adding the dependency.
C. The developer added the dependency as a dev dependency, and NODE_ENV is set to production.
D. The developer missed the option --save when adding the dependency.

Answer: C

Explanation:
In JavaScript server-side development using Node.js, dependency management is typically handled through package managers such as npm or yarn. These tools categorize installed packages into:
dependencies - required for running the application in any environment
devDependencies - required only during development (testing tools, build tools, documentation generators, etc.) When a package is installed using:
yarn add <package> --dev
it is placed under the "devDependencies" section of package.json.
Behavior of Production Mode
Node.js uses the environment variable:
NODE_ENV=production
When this environment variable is set to production, both npm and Yarn follow the standard Node.js convention and skip installing devDependencies. This is done to optimize production builds and reduce deployment size. This is a known and documented behavior in Node.js package management tools.
Therefore, if:
The developer added the date-manipulation library as a dev dependency, and Other team members execute yarn in an environment where NODE_ENV=production is set, then Yarn will not install that dependency because devDependencies are intentionally excluded in production mode.
This explains the behavior described in the question.
Why the Other Options Are Incorrect
Option A:
"YARN_ENV is set to production" is incorrect because Yarn does not use the variable YARN_ENV for dependency installation behavior. Node.js tools use NODE_ENV, not YARN_ENV.
Option B:
This is incorrect because Yarn automatically writes dependencies into package.json. Unlike older npm versions, there is no need for the --save flag.
Option D:
There is no such option as --add. The correct syntax is simply:
yarn add <package>
Missing an option that does not exist cannot be the cause.
JavaScript Knowledge Reference
Node.js uses the environment variable NODE_ENV to determine production or development mode.
Package managers (npm and Yarn) follow the rule that when NODE_ENV=production, only "dependencies" are installed and "devDependencies" are skipped.
Yarn automatically persists installed packages to package.json without requiring --save.
Yarn uses the command yarn add to add dependencies; there is no --add flag.

NEW QUESTION # 135
Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as [1,2]?
Choose 3 answer

A. let x = arr.filter ((a) => 2 }) ;
B. let x =arr.splice(0, 2);
C. let x = arr. slice (0, 2);
D. let x = arr. slice (2);
E. let x arr.filter((a) => (return a <= 2 });

Answer: B,C,E

NEW QUESTION # 136
Which statement accurately describes the behavior of the async/await keywords?

A. The associated function sometimes returns a promise.
B. The associated function can only be called via asynchronous methods.
C. The associated function is asynchronous, but acts like synchronous code.
D. The associated class contains some asynchronous functions.

Answer: C

Explanation:
When async is added to a function:
async function example() {}
JavaScript guarantees:
The function always returns a Promise, regardless of what is returned inside.
Inside the function, await pauses execution until a Promise resolves.
Code appears synchronous even though it uses asynchronous behavior.
Analysis of each option:
A incorrect:
Not "sometimes"-an async function always returns a Promise.
B incorrect:
Async functions can be called just like normal functions.
C incorrect:
Async/await has nothing to do with classes specifically.
D correct:
This is the standard description:
"Async functions behave asynchronously but allow writing code that looks synchronous." JavaScript Knowledge Reference (text-only) async functions always return Promises.
await pauses execution of the async function.
Async/await syntax creates synchronous-looking code on top of asynchronous operations.

NEW QUESTION # 137
Refer to code below:
Let productSKU = '8675309' ;
A developer has a requirement to generate SKU numbers that are always 19 characters lon, starting with 'sku', and padded with zeros.
Which statement assigns the values sku0000000008675309 ?

A. productSKU = productSKU .padEnd (16. '0').padstart(19, 'sku');
B. productSKU = productSKU .padStart (19. '0').padstart('sku');
C. productSKU = productSKU .padStart (16. '0').padstart(19, 'sku');
D. productSKU = productSKU .padEnd (16. '0').padstart('sku');

Answer: C

NEW QUESTION # 138
......

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