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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Testing	7%	- Test coverage and reliability - Writing and modifying unit tests - Test effectiveness evaluation - Unit testing concepts
Debugging and Error Handling	7%	- Error handling techniques (try/catch/finally) - Breakpoints and code inspection - Console methods for debugging - Custom error types
Variables, Types, and Collections	23%	- Strings, numbers, and dates - Truthy and falsy evaluations - Primitive and complex data types - Variable declarations and initialization - JSON parsing and manipulation - Arrays and collections - Type coercion and conversion
Objects, Functions, and Classes	25%	- Object creation and manipulation - Higher-order functions - Modules and decorators - ES6 classes and inheritance - Variable scope and closures - Prototypal inheritance - Arrow functions - Function declarations and expressions - Execution flow and context
Server Side JavaScript	8%	- CLI commands - Node.js fundamentals - Package management (npm) - Server-side JavaScript implementations - Core Node.js modules
Browser and Events	17%	- Browser-specific APIs - DOM manipulation - Event propagation (bubbling and capturing) - Event handling and listeners - Browser Developer Tools usage - Interacting with forms and user input
Asynchronous Programming	13%	- Callbacks - Promises (creation, chaining, error handling) - Asynchronous patterns for business requirements - Async/Await syntax - Event loop and execution flow

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q64-Q69):

NEW QUESTION # 64
Refer to the code:

Given the code above, which three properties are set pet1?
Choose 3 answers:

A. Size
B. Name
C. Type
D. Owner
E. canTalk

Answer: A,C,E

NEW QUESTION # 65
What are two unique features of functions defined with a fat arrow as compared to normal function definition?
Choose 2 answers

A. If the function has a single expression in the function body, the expression will be evaluated and implicit returned.
B. The function generated its own this making it useful for separating the function's scope from its enclosing scope.
C. The function receives an argument that is always in scope, called parentThis, which is the enclosing lexical scope.
D. The function uses the this from the enclosing scope.

Answer: A,B

NEW QUESTION # 66
A developer wrote the following code:
01 let X = object.value;
02
03 try {
04handleObjectValue(X);
05 } catch (error) {
06 handleError(error);
07 }
Thedeveloper has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs.
How can the developer change the code to ensure this behavior?

A. 03 try{04 handleObjectValue(x);05 } catch(error){06 handleError(error);07 } finally {08 getNextValue();10 }
B. 03 try{04 handleObjectValue(x);05 } catch(error){06 handleError(error);07 }08 getNextValue();
C. 03 try {04 handleObjectValue(x)05 ........................
D. 03 try{04 handleObjectValue(x);05 }catch(error){06 handleError(error);07 } then {08 getNextValue();09 }

Answer: C

NEW QUESTION # 67
Refer to the code below:
01 const objBook = {
02 title: ' JavaScript ' ,
03 };
04 Object.preventExtensions(objBook);
05 const newObjBook = objBook;
06 newObjBook.author = ' Robert ' ;
What are the values of objBook and newObjBook respectively?

A. { author: " Robert " }
{ author: " Robert " , title: " JavaScript " }
B. { author: " Robert " , title: " JavaScript " }
undefined
C. { author: " Robert " , title: " JavaScript " }
{ author: " Robert " , title: " JavaScript " }
D. { title: " JavaScript " }
{ title: " JavaScript " }

Answer: D

Explanation:
* Object.preventExtensions(obj) This built-in JavaScript method marks an object so that no new properties can be added to it. Existing properties can still be read and updated, but adding new ones is disallowed.
* const newObjBook = objBook; Both variables reference the same object in memory. JavaScript objects are assigned by reference, not copied.
* newObjBook.author = " Robert " ; Because the object has been marked as non-extensible, JavaScript will not allow new properties to be added. The behavior depends on mode:
* In non-strict mode: the assignment silently fails and does nothing.
* In strict mode: this would throw a TypeError.
Since nothing indicates strict mode, this is non-strict behavior, making the assignment fail silently.
Therefore, the object remains:
{ title: " JavaScript " }
Both objBook and newObjBook point to the same unchanged object.
This matches option A.
JavaScript knowledge references (text-only)
* Object.preventExtensions() prevents adding new properties.
* Assigning an object to another variable copies the reference, not the object.
* Adding a property to a non-extensible object silently fails in non-strict mode.

NEW QUESTION # 68
Refer to the code below:

What is the output if this function when called with an empty array?

A. Retruns 0
B. Return NaN
C. Throws an error
D. Return 10

Answer: D

NEW QUESTION # 69
......

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