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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q23-Q28):

NEW QUESTION # 23
A developer creates a class that represents a blog post based on the requirements that a Post should have a body, author, and view count. The code is shown below:

Which statement should be inserted in the placeholder on line 02 to allow for a variable to be sent to a new instance of a port with the three attributes correctly populated?

Answer: B


NEW QUESTION # 24
Refer to the code below:
01 const exec = (item, delay) =>{
02 new Promise(resolve => setTimeout( () => resolve(item), delay)),
03 async function runParallel() {
04 Const (result1, result2, result3) = await Promise.all{
05 [exec ('x', '100') , exec('y', 500), exec('z', '100')]
06 );
07 return `parallel is done: $(result1) $(result2)$(result3)`;
08 }
}
}
Which two statements correctly execute the runParallel () function?
Choose 2 answers

Answer: A,B


NEW QUESTION # 25
Given HTML below:
<div>
<div id ="row-uc"> Universal Container</div>
<div id ="row-aa">Applied Shipping</div>
<div id ="row-bt"> Burlington Textiles </div>
</div>
Which statement adds the priority = account CSS class to the universal Containers row ?

Answer: B


NEW QUESTION # 26
Refer to the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));

When does Promise.finally on line 08 get called?

Answer: B


NEW QUESTION # 27
Refer to code below:
Let a ='a';
Let b;
// b = a;
console.log(b);
What is displayed when the code executes?

Answer: C


NEW QUESTION # 28
......

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