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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I Exam |
| Exam Number: | JS-Dev-101 / JavaScript-Developer-I |
| Passing Score: | 65% |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified Lightning Web Components Specialist |
| Available Languages: | English, Japanese |
| Exam Format: | Multiple-choice, Multiple-select |
| Certificate Validity Period: | No expiration; requires regular maintenance via Trailhead modules |
| Exam Duration: | 105 minutes |
| Exam Price: | USD 200 (+ applicable taxes) |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Recommended Training: | Salesforce JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | Salesforce JavaScript-Developer-I Sample Questions |
| Exam Way: | Online proctored or onsite at authorized testing centers |
| Pre Condition: | No formal prerequisites; 1–2 years of JavaScript development experience recommended |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascript-developer-i |
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Salesforce JavaScript-Developer-I Certification Exam covers a range of topics related to JavaScript programming on the Salesforce platform, including data modeling, security, user interface development, and Apex programming. JavaScript-Developer-I exam is designed to test the candidate's ability to design, develop, and deploy custom applications, as well as their knowledge of best practices and industry standards. Passing JavaScript-Developer-I exam indicates that the candidate has a deep understanding of the Salesforce platform and the ability to create effective and efficient solutions using JavaScript programming.
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NEW QUESTION # 84
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?
Answer: D
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 References
* 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 # 85
Refer to the following code:
Which two statement could be inserted at line 17 to enable the function call on line 18?
Choose 2 answers
Answer: B,C
NEW QUESTION # 86
Which statement accurately describes the behaviour of the async/ await keyworks ?
Answer: D
NEW QUESTION # 87
A developer needs to test this functions:
Which two assert statements are valid tests for this function?
Answer: A,D
NEW QUESTION # 88
Refer to the code below:
const pi = 3.1415926;
What is the data type of pi?
Answer: C
Explanation:
In JavaScript, there is only one numeric type for ordinary numbers: number.
* JavaScript number is a double-precision 64-bit binary format (IEEE 754).
* There is no separate float, double, or decimal type in core JavaScript.
So:
typeof pi === ' number ' ;
Hence, the correct answer is:
* A. Number
Options B, C, D are specific numeric types found in other languages (like C, Java, C#), not distinct types in JavaScript.
Study Guide Concepts:
* JavaScript primitive types
* typeof operator and number
* Lack of separate float / double / decimal types in JS
NEW QUESTION # 89
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