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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Variables, Types, and Collections	23%	- Array methods and data manipulation - JSON parsing and usage - Variable declaration and initialization - Type coercion and conversion rules - Truthy and falsy values - Working with strings, numbers, dates, and booleans
Topic 2: Debugging and Error Handling	7%	- Debugging tools and breakpoints - Error types and exception handling - Defensive programming practices - Console methods and logging
Topic 3: Server-Side JavaScript	8%	- Core Node.js modules - Node.js fundamentals and runtime - Command-line tools and scripts - Module system and require/import
Topic 4: Objects, Functions, and Classes	25%	- Closures and execution context - Object creation, properties, and methods - Decorators and advanced function patterns - Modules and imports/exports - Class syntax, inheritance, and prototypes - Function definitions, parameters, and scope
Topic 5: Browsers and Events	17%	- Window and document object properties - Document Object Model (DOM) manipulation - Browser APIs and Web Storage - Event handling, propagation, and delegation - Script loading and execution order
Topic 6: Testing	7%	- Test doubles and mocks - Testing frameworks and assertions - Unit testing concepts - Code coverage and best practices
Topic 7: Asynchronous Programming	13%	- Callbacks and callback hell - Async/await syntax - Fetch API and HTTP requests - Promises and chaining - Event loop and micro/macro tasks

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q81-Q86):

NEW QUESTION # 81
A developer at Universal Containers is creating their new landing page basedon HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed when the webpage is fully loaded (HTML content and all related files), in order to do some custom initializations.
Which implementation should be used to call Fe:s:-a;::eHec5;te::.-.ter.: based on the business requirement above?

A. Add a handler to the personalizeWebsiteContent script to handlethe load event
B. Add a handler to the personalizeWebsiteContent script tohandle the DOMContentLoaded event
C. Add a listener to the window object to handle the lead event
D. Add a listener to thewindow object to handle the DOMContentLoaded event

Answer: C

NEW QUESTION # 82
A developer has a web server running with Node.js. The command to start the web server is node server.js.
The web server started having
latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?

A. NODE_DEBUG=true node server.js
B. NODE_DEBUG=http,https node server.js
C. DEBUG=http, https node server.js
D. DEBUG=true node server.js

Answer: D

NEW QUESTION # 83
HTML:
< p > The current status of an Order: < span id= " status " > In Progress < /span > < /p > Which JavaScript statement changes ' In Progress ' to ' Completed ' ?

A. document.getElementById( " .status " ).innerHTML = ' Completed ' ;
B. document.getElementById( " status " ).Value = ' Completed ' ;
C. document.getElementById( " #status " ).innerHTML = ' Completed ' ;
D. document.getElementById( " status " ).innerHTML = ' Completed ' ;

Answer: D

Explanation:
To select an element by ID, JavaScript uses:
document.getElementById( " status " )
The ID must be passed without any selector prefixes (no dot, no hash).
Then, to update the text inside:
element.innerHTML = ' Completed ' ;
Why the others are wrong:
* A uses " .status " which would match a CSS class, not an ID.
* B incorrectly prepends #, which is used in CSS selectors but not in getElementById.
* D attempts to use .Value with capital V, which is incorrect for DOM text; .value only applies to form elements.
Thus, option C is correct.
JavaScript Knowledge References (text-only)
* getElementById takes a raw ID string with no prefixes.
* innerHTML updates an element's displayed HTML content.

NEW QUESTION # 84
A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client.
The team wants a web server that runs on Node.Js, and they want to use thenew web framework Minimalist.Js.
The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?
Choose 2 answers

A. Koa
B. Gatsby
C. Angular
D. Express

Answer: B,C

NEW QUESTION # 85
A developer is wondering whether to use, Promise.then or Promise.catch, especially when a Promise throws an error?
Which two promises are rejected?
Which 2 are correct?

A. New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error)));
B. New Promise((resolve, reject) => (throw 'cool error here'}).catch(error => console.error(error)) ;
C. Promise.reject('cool error here').then(error => console.error(error));
D. Promise.reject('cool error here').catch(error => console.error(error));

Answer: B,D

NEW QUESTION # 86
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