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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Asynchronous JavaScript	- Promises and async/await - Error handling in async workflows - Event loop and concurrency model
Salesforce Platform Integration	- Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript
Testing and Debugging	- Debugging techniques and tools - Unit testing principles
Browser and DOM Interaction	- DOM manipulation and traversal - Browser APIs (fetch, storage, timers) - Event handling and propagation
JavaScript Language Fundamentals	- Functions, scope, and closures - Data types, variables, and operators - ES6+ syntax and features

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q92-Q97):

NEW QUESTION # 92
A developer is wondering whether to use, Promise.then or Promise.catch, especially when a Promise throws an error?
Which two promises are rejected?
Which 2 are correct?

A. New Promise((resolve, reject) => (throw 'cool error here'}).catch(error => console.error(error)) ;
B. Promise.reject('cool error here').then(error => console.error(error));
C. Promise.reject('cool error here').catch(error => console.error(error));
D. New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error)));

Answer: A,C

NEW QUESTION # 93
At Universal Containers, every team has its own way of copyingJavaScript objects. The code snippet shows an Implementation from one team:

What is the output of the code execution?

A. Hello John Doe
B. Hello Dan
C. Hello Dan Doe
D. SyntaxError: Unexpected token in JSON

Answer: D

NEW QUESTION # 94
The developer wants to test the array shown:
const arr = Array(5).fill(0)
Which two tests are the most accurate for this array ?
Choose 2 answers:

A. arr.forEach(elem => console.assert(elem === 0)) ;
B. console.assert( arr.length === 5 );
C. console.assert (arr.length >0);
D. console.assert(arr[0] === 0 && arr[ arr.length] === 0);

Answer: A,B

NEW QUESTION # 95
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.m Is assigned the correct object.
B. The m variable is assigned the correct object but this.name remains undefined.
C. window.name is assigned to 'hello' and the variable = remains undefined.
D. The m variable is assigned the correct object.

Answer: C

NEW QUESTION # 96
A developer receives a comment from the Tech lead that the code below gives an error.

Which line edit should be made to make this code run?

A. 03 if (year == 2019) (
B. 01 let monthname = 'July ';
C. 02 const year = 2020;
D. 02 let year = 2019 ;

Answer: C

NEW QUESTION # 97
......

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