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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Debugging and Error Handling	7%	- Breakpoints and code inspection - Error handling techniques (try/catch/finally) - Console methods for debugging - Custom error types
Topic 2: Server Side JavaScript	8%	- Core Node.js modules - Node.js fundamentals - Server-side JavaScript implementations - CLI commands - Package management (npm)
Topic 3: Asynchronous Programming	13%	- Async/Await syntax - Asynchronous patterns for business requirements - Event loop and execution flow - Promises (creation, chaining, error handling) - Callbacks
Topic 4: Objects, Functions, and Classes	25%	- Execution flow and context - Function declarations and expressions - Arrow functions - Object creation and manipulation - Modules and decorators - Variable scope and closures - ES6 classes and inheritance - Prototypal inheritance - Higher-order functions
Topic 5: Browser and Events	17%	- DOM manipulation - Browser Developer Tools usage - Event handling and listeners - Event propagation (bubbling and capturing) - Browser-specific APIs - Interacting with forms and user input
Topic 6: Variables, Types, and Collections	23%	- Primitive and complex data types - Arrays and collections - Variable declarations and initialization - Truthy and falsy evaluations - Strings, numbers, and dates - Type coercion and conversion - JSON parsing and manipulation
Topic 7: Testing	7%	- Test effectiveness evaluation - Writing and modifying unit tests - Test coverage and reliability - Unit testing concepts

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The Salesforce JavaScript-Developer-I certification exam offers a great opportunity to advance your career. With the Salesforce Certified JavaScript Developer (JS-Dev-101) certification exam beginners and experienced professionals can demonstrate their expertise and knowledge. After passing the Salesforce Certified JavaScript Developer (JS-Dev-101) (JavaScript-Developer-I) exam you can stand out in a crowded job market. The Salesforce Certified JavaScript Developer (JS-Dev-101) (JavaScript-Developer-I) certification exam shows that you have taken the time and effort to learn the necessary skills and have met the standards in the market.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q33-Q38):

NEW QUESTION # 33
Refer of the string below:
Const str = 'sa;esforce'=;
Which two statement result in the word 'Sale'?
Choose 2 answers

A. str, substr(1,5) ;
B. str, substr(0,5) ;
C. str, substring(1,5) ;
D. str, substring (0,5) ;

Answer: B,D

NEW QUESTION # 34
Refer to the code:
01 const event = new CustomEvent(
02 // Missing code
03 );
04 obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options can be inserted at line 02?

A. { type: ' update ' , recordId: ' 123abc ' }
B. ' update ' , { recordId: ' 123abc ' }
C. ' update ' , { detail: { recordId: ' 123abc ' } }
D. ' update ' , ' 123abc '

Answer: B,C

Explanation:
The correct constructor signature for CustomEvent is:
new CustomEvent(eventName, optionsObject)
Where:
* eventName is a string.
* optionsObject may include:
* detail # used to pass custom data
* bubbles
* cancelable, etc.
Example:
new CustomEvent( ' update ' , {
detail: { recordId: ' 123abc ' }
});
Now evaluate each option:
Option A
{ type: ' update ' , recordId: ' 123abc ' }
Incorrect: The constructor requires (eventName, options), not a single object. type is not used this way.
Option B
' update ' , { detail: { recordId: ' 123abc ' } }
Correct format. detail is the proper place for custom event data.
Option C
' update ' , ' 123abc '
Incorrect: The second argument must be an object (options), not a string.
Option D
' update ' , { recordId: ' 123abc ' }
Acceptable because any extra properties on the options object are still allowed, even though best practice is to use detail.
This still creates a valid CustomEvent, and the event will dispatch successfully.
Thus the two correct answers are B and D .
JavaScript Knowledge References (text-only)
* new CustomEvent(name, options) is the required syntax.
* The detail property of the options object is the standard location for custom data.
* The second argument must be an object; other types are invalid.

NEW QUESTION # 35
developer wants to use a module named universalContainersLib and them call functions from it.
How should a developer import every function from the module and then call the functions foo and bar ?

A. import (foo, bar) from '/path/universalContainersLib.js';
foo();
bar();
B. import * from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();
C. import all from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();
D. import * ad lib from '/path/universalContainersLib.js';
lib.foo();
lib.bar();

Answer: D

NEW QUESTION # 36
Given the code below:

Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?

A. console.group(usersList) ;
B. console.table(usersList) ;
C. console.info(usersList) ;
D. console.groupCol lapsed (usersList) ;

Answer: A

NEW QUESTION # 37
Which statement parses successfully?

A. JSON.parse ("foo");
B. JSON.parse (""foo'");
C. JSON.parse ("foo");
D. JSON. parse (""foo"');

Answer: D

NEW QUESTION # 38
......

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