JavaScript-Developer-I Exam Guide and JavaScript-Developer-I Exam Prep - JavaScript-Developer-I Exam Torrent

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q82-Q87):

NEW QUESTION # 82
A developer wants to create an object from a function in the browser using the code below.

What happens due to the lack of the mm keyword on line 02?

A. window.name is assigned to 'hello' and the variable = remains undefined.
B. The m variable is assigned the correct object.
C. window.m Is assigned the correct object.
D. The m variable is assigned the correct object but this.name remains undefined.

Answer: A

NEW QUESTION # 83
Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as [1, 2]?
Choose 3 answer

A. let x = arr. slice (0, 2);
B. let x = arr.filter ((a) => 2 }) ;
C. let x =arr.splice(0, 2);
D. let x arr.filter((a) => (return a <= 2 });
E. let x = arr. slice (2);

Answer: A,C,D

NEW QUESTION # 84
A developer is trying to handle an error within a function.
Which code segment shows the correct approach to handle an error without propagating it elsewhere?

Answer: A

NEW QUESTION # 85
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly insidethe DOM, like the one in the code below:

All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.

A. Use the browser console to execute a scriptthat prevents the load event to be fired.
B. Use the DOM inspector to remove all the elements containing the class ad-library-item.
C. Use the browser to execute a script that removes all the element containing the class ad-library-item.
D. Use the DOM inspector to prevent the load eventto be fired.

Answer: C

NEW QUESTION # 86
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.

Which two results occur when running this test on the updated sum3 function?
Choose 2 answers

A. The line 02 assertion fails.
B. The line 05 assertion fails.
C. The line 02 assertion passes.
D. The line 05 assertion passes.

Answer: B,C

NEW QUESTION # 87
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