Salesforce Developers JS-Dev-101 certkingdom exam torrent & JS-Dev-101 practice dumps

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Section	Weight	Objectives
Objects, Functions, and Classes	25%	- ES6 classes, inheritance, modules, decorators - Function types, scope, closures, arrow functions - Object creation, properties, prototypes
Server Side JavaScript	8%	- Node.js fundamentals and core modules - Package management and CLI tools
Browser and Events	17%	- DOM selection and manipulation - Event handling, propagation, listeners - Browser APIs and developer tools
Debugging and Error Handling	7%	- Console usage, breakpoints and debugging techniques - Error types and handling strategies
Testing	7%	- Test coverage and improvement - Unit test structure and effectiveness
Variables, Types, and Collections	23%	- Data types, type coercion, truthy/falsy values - JSON parsing and manipulation - Variable declaration and scope - Strings, numbers, dates, arrays and methods
Asynchronous Programming	13%	- Callbacks, promises, async/await - Event loop and execution flow

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q37-Q42):

NEW QUESTION # 37
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 05 assertion passes.
B. The line 02 assertion fails.
C. The line 02 assertion passes.
D. The line 05 assertion fails.

Answer: C,D

NEW QUESTION # 38
Refer to code below:
Let a ='a';
Let b;
// b = a;
console.log(b);
What is displayed when the code executes?

A. A
B. Undefined
C. ReferenceError: b is not defined
D. Null

Answer: B

NEW QUESTION # 39
A developer at Universal Containers is creating their new landing pagebased on HTML, CSS, and JavaScript. The website includes multiple external resources that are loaded when the page is opened.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed when the webpage isloaded and there is no need to wait for the resources to be available.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?

A. windows,addEventListener('load', personalizeWebsiteContent);
B. windows,addEventListener('onDOMCContentLoaded', personalizeWebsiteContent);
C. windows,addEventListener('onload', personalizeWebsiteContent);
D. windows,addEventListener('DOMContent Loaded ', personalizeWebsiteContent);

Answer: A

NEW QUESTION # 40
Which statement accurately describes the behaviour of the async/ await keyworks ?

A. The associated sometimes returns a promise.
B. The associated function will always return a promise
C. Theassociated function can only be called via asynchronous methods
D. The associated class contains some asynchronous functions.

Answer: A

NEW QUESTION # 41
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?

Answer: B

NEW QUESTION # 42
......

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