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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Topic	Details
Topic 1	Objects, Functions, and Classes: In this section, the focus is on applying object-oriented principles, functions, and classes. As a Salesforce JavaScript programmer, you will need to locate optimal function implementations and understand how to structure objects and classes for business solutions. You will also be tested on your ability to use JavaScript modules and decorators, while analyzing variable scope and execution flow.
Topic 2	Browser and Events: The topic will challenge your ability to work with events, event handlers, and the DOM. You will need to demonstrate how to manage event propagation and utilize browser-specific APIs. Additionally, proficiency in using browser developer tools to investigate code behavior will be tested, making it crucial for you to understand browser interactions thoroughly.
Topic 3	Asynchronous Programming: Asynchronous programming is a key concept in JavaScript, and this section tests your understanding of event loops, asynchronous code execution, and handling promises. Salesforce JavaScript programmer will need to demonstrate their ability to implement asynchronous solutions for business requirements.
Topic 4	Debugging and Error Handling: This section will measure the ability of JavaScript programmer to properly handle errors and debug JavaScript code. You will be expected to apply debugging techniques, such as using the console and breakpoints, to resolve issues. Proper error handling is crucial, and the exam will evaluate your skills in managing and correcting errors efficiently within your code.
Topic 5	Server Side JavaScript: This section focuses on Node.js and server-side JavaScript. Salesforce JavaScript programmers will be tested on their ability to identify appropriate Node.js implementations and commands for given scenarios. Additionally, you will need to recognize which Node.js core modules, libraries, and package management solutions fit specific requirements, reflecting your understanding of server-side development with JavaScript.
Topic 6	Testing: In the topic, you will be required to evaluate unit tests and improve them. The exam will assess your ability to identify ineffective tests and modify them to make them more robust and accurate. This topic ensures that you can write and maintain effective tests, a crucial skill for ensuring code quality and reliability in professional environments.

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q46-Q51):

NEW QUESTION # 46
Refer to the code below:

What are the values for first and second once the executes?

A. First is who and second is when.
B. First is why and second is where.
C. First is why and second is when.
D. First is who and second is where.

Answer: B

NEW QUESTION # 47
A developer executes:
document.cookie;
document.cookie = ' key=John Smith ' ;
What is the behavior?

A. Cookies are not read because line 01 should be document.cookies, but the key value is set and all cookies are wiped.
B. Cookies are read and the key value is set, the remaining cookies are unaffected.
C. Cookies are read, but the key value is not set because the value is not URL encoded.
D. Cookies are read and the key value is set, and all cookies are wiped.

Answer: B

NEW QUESTION # 48
Refer to the code below:
Let textvalue = '1984';
Which code segment shows a correct way to convert this string to an integer?

A. Let numberValue = (Number) textvalue;
B. Let numberValue = Number(textvalue);
C. Let numberValue = Integer ( textValue );
D. Let numberValue = textValue. Tointeger ( ) ;

Answer: B

NEW QUESTION # 49
Which two implementations of utils.js support foo and bar?

A. const foo = () = > { return ' foo ' ; };
const bar = () = > { return ' bar ' ; };
export default { foo, bar };
B. const foo = () = > { return ' foo ' ; };
const bar = () = > { return ' bar ' ; };
export { foo, bar };
C. import { foo, bar } from " ./helpers/utils.js " ;
export { foo, bar };
D. export default class {
foo() { return ' foo ' ; }
bar() { return ' bar ' ; }
}

Answer: B,C

Explanation:
The correct answers are A and C because both use named exports for foo and bar.
A module can export multiple values by name:
export { foo, bar };
This allows another file to import them like this:
import { foo, bar } from ' ./utils.js ' ;
Option A is correct because it defines both functions locally and exports both of them as named exports.
const foo = () = > { return ' foo ' ; };
const bar = () = > { return ' bar ' ; };
export { foo, bar };
Option C is also correct after correcting the typing issue so that both foo and bar are imported first:
import { foo, bar } from " ./helpers/utils.js " ;
export { foo, bar };
This is called re-exporting. The module imports foo and bar from another module, then exports them again from utils.js.
Option B is not the best answer for named access because it exports one default object:
export default { foo, bar };
That would require a default import first:
import utils from ' ./utils.js ' ;
utils.foo();
utils.bar();
It does not directly support named imports in the same way as:
import { foo, bar } from ' ./utils.js ' ;
Option D exports a default class. Its foo() and bar() are class instance methods, not named exported functions.
It would require usage like:
import Utils from ' ./utils.js ' ;
const utils = new Utils();
utils.foo();
utils.bar();
So for direct multiple function exports, the correct implementations are A and C .

NEW QUESTION # 50
Refer to the following array:
Let arr1 = [1, 2, 3, 4, 5];
Which two lines of codes result in a second array, arr2, being created such that arr2 is not a reference to arr1? Choose 2 answers

A. Let arr2 = arr1;
B. Let arr2 = arr1 .slice (0, 5);
C. Let arr2 = arr1 sort ();
D. Let arr2 = Array. From (arr1) ;

Answer: A,C

NEW QUESTION # 51
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