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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

SectionWeightObjectives
Testing7%- Test effectiveness evaluation
- Writing and modifying unit tests
- Unit testing concepts
- Test coverage and reliability
Debugging and Error Handling7%- Error handling techniques (try/catch/finally)
- Console methods for debugging
- Custom error types
- Breakpoints and code inspection
Browser and Events17%- Event propagation (bubbling and capturing)
- Browser-specific APIs
- Interacting with forms and user input
- DOM manipulation
- Event handling and listeners
- Browser Developer Tools usage
Objects, Functions, and Classes25%- Object creation and manipulation
- Arrow functions
- Execution flow and context
- Modules and decorators
- Variable scope and closures
- Function declarations and expressions
- Higher-order functions
- Prototypal inheritance
- ES6 classes and inheritance
Server Side JavaScript8%- Core Node.js modules
- CLI commands
- Package management (npm)
- Server-side JavaScript implementations
- Node.js fundamentals
Asynchronous Programming13%- Asynchronous patterns for business requirements
- Callbacks
- Event loop and execution flow
- Async/Await syntax
- Promises (creation, chaining, error handling)
Variables, Types, and Collections23%- Truthy and falsy evaluations
- Primitive and complex data types
- Type coercion and conversion
- Arrays and collections
- Variable declarations and initialization
- Strings, numbers, and dates
- JSON parsing and manipulation

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

NEW QUESTION # 81
A test has a dependency on database.query. During the test the dependency is replaced with an object called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time.
Which two test approaches describe the requirement?
Choose 2 answers

Answer: C,D


NEW QUESTION # 82
At Universal Containers, every team has its own way of copyingJavaScript objects. The code snippet shows an Implementation from one team:

What is the output of the code execution?

Answer: A


NEW QUESTION # 83
A developer needs to debug a Node.js web server because a runtime error keeps occurring at one of the endpoints.
The developer wants to test the endpoint on a local machine and make the request against a local server to look at the behavior. In the source code, the server.js file will start the server. The developer wants to debug the Node.js server only using the terminal.
Which command can the developer use to open the CLI debugger in their current terminal window?
(With corrected typing errors: node_inspect # node inspect, node_start_inspect # node start inspect.)

Answer: B


NEW QUESTION # 84
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 ?

Answer: C


NEW QUESTION # 85
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?

Answer: C

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 References (text-only)
* Promise .then() callbacks execute after the current call stack finishes (microtask queue).
* Synchronous logs run immediately, before promise callbacks.


NEW QUESTION # 86
......

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