Valid Salesforce JavaScript-Developer-I Exam Papers & Test JavaScript-Developer-I Dumps Demo

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Topic 1: Salesforce Platform Integration	- Calling Apex methods from JavaScript - Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage
Topic 2: Asynchronous JavaScript	- Error handling in async workflows - Event loop and concurrency model - Promises and async/await
Topic 3: Testing and Debugging	- Debugging techniques and tools - Unit testing principles
Topic 4: Browser and DOM Interaction	- Browser APIs (fetch, storage, timers) - Event handling and propagation - DOM manipulation and traversal
Topic 5: 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 (Q52-Q57):

NEW QUESTION # 52
A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?
A)

B)

C)

D)

A. Option
B. Option
C. Option
D. Option

Answer: B

NEW QUESTION # 53
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. Promise.reject('cool error here').catch(error => console.error(error));
B. Promise.reject('cool error here').then(error => console.error(error));
C. New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error)));
D. New Promise((resolve, reject) => (throw 'cool error here'}).catch(error => console.error(error)) ;

Answer: A,D

NEW QUESTION # 54
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..

What is the output when executing the code above

A. 50
80
50
72
B. 50
80
Uncaught Reference Error:this,discount is undefined
72
C. 50
80
72
D. 50
Uncaught TypeError: saleItem,desrcription is not a function
50
80

Answer: A

NEW QUESTION # 55
Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as (3, 4, 5)?
Choose 3 answers

A. Let x = arr.filter( (a) => ( a < 2)) ;
B. Let x = arr.aplice (2, 3);
C. Let x = arr.alice (2) ;
D. Let x = arr.filter( (a) => )return a > 2 )) ;
E. Let x = arr. Slince (2, 3);

Answer: B,C,D

NEW QUESTION # 56
Given the code below:
Function myFunction(){
A =5;
Var b =1;
}
myFunction();
console.log(a);
console.log(b);
What is the expected output?

A. Both lines 08 and 09 are executed, and the variables are outputted.
B. Line 08 outputs the variable, but line 09 throws an error.
C. Both lines 08 and 09 are executed, but values outputted are undefined.
D. Line 08 thrones an error, therefore line 09 is never executed.

Answer: B

NEW QUESTION # 57
......

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