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The Salesforce Certified JavaScript Developer (JS-Dev-101) (JavaScript-Developer-I) certification examination is an essential component of professional development, and passing this Salesforce JavaScript-Developer-I test can increase career options and a rise in salary. Nonetheless, getting ready for the Prepare for your JavaScript-Developer-I Exam may be difficult, and many working professionals have trouble locating the JavaScript-Developer-I practice questions they need to succeed in this endeavor.
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-001 |
| Certificate Validity Period: | 1 year (maintenance required via Salesforce certification maintenance modules) |
| Real Exam Qty: | 60 |
| Related Certifications: | Salesforce Certified JavaScript Developer I Salesforce Certified Platform Developer I Salesforce Certified Platform App Builder |
| Available Languages: | English |
| Exam Duration: | 105 minutes |
| Passing Score: | 65% |
| Exam Format: | Multiple Choice, Multiple Select |
| Exam Price: | USD 200 (may vary by region/tax) |
| Recommended Training: | Salesforce Trailhead JavaScript Developer I Prep Salesforce Developer Learning Paths |
| Exam Registration: | Salesforce Credentials Page Salesforce Certification Registration (Webassessor) |
| Sample Questions: | Salesforce JavaScript-Developer-I Sample Questions |
| Exam Way: | Online proctored or onsite testing via Kryterion Webassessor |
| Pre Condition: | No formal prerequisites, but familiarity with JavaScript and Salesforce platform development is strongly recommended. |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascriptdeveloper1 |
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To prepare for the Salesforce JavaScript-Developer-I Exam, candidates should have a strong foundation in programming and JavaScript development, as well as experience working with the Salesforce platform. They can also take advantage of a range of study resources provided by Salesforce, including study guides, practice exams, and training courses. By investing the time and effort to prepare for the exam, developers can improve their skills and knowledge, and demonstrate their expertise to potential employers and clients.
Salesforce JavaScript-Developer-I is a certification exam designed for professionals who want to demonstrate their expertise in using JavaScript and related technologies to develop custom applications on the Salesforce platform. JavaScript-Developer-I exam measures the candidate's knowledge of the fundamental concepts of JavaScript, including data types, control structures, functions, arrays, and objects, as well as their ability to apply this knowledge to solve real-world programming problems.
NEW QUESTION # 98
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: A
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 # 99
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. The pseudocode is below:
There is a new requirement for a developer to implement a description method that will retrun a brief description for item and saleitem.
What is the out when executing the code above?
Answer: A
NEW QUESTION # 100
Given the code below:
const copy = JSON.stringify([ new String(' false '), new Bollean( false ), undefined ]); What is the value of copy?
Answer: C
NEW QUESTION # 101
A developer wants to advocate for a mature, well-supported web framework/library instead of a new one (Minimalist.js).
Which two should be recommended?
Answer: C,D
Explanation:
React and Vue are:
* Mature front-end JavaScript frameworks/libraries.
* Have large communities.
* Are widely supported and used in production across industries.
* Appropriate for building browser-based Single Page Applications.
Express and Koa are server-side frameworks , not front-end SPA frameworks.
The scenario describes building a browser SPA, so the correct seasoned options are React and Vue.
JavaScript Knowledge References (text-only)
* React and Vue are client-side frameworks for SPA development.
* Express and Koa are backend frameworks for Node.js.
NEW QUESTION # 102
What are two unique feature of function defined with a fat arror as compared to normal functional definition?
Choose 2 answers
Answer: A
NEW QUESTION # 103
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