FREQUENT JAVASCRIPT-DEVELOPER-I UPDATES - JAVASCRIPT-DEVELOPER-I VALID PRACTICE QUESTIONS

Frequent JavaScript-Developer-I Updates - JavaScript-Developer-I Valid Practice Questions

Frequent JavaScript-Developer-I Updates - JavaScript-Developer-I Valid Practice Questions

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Salesforce JavaScript-Developer-I (Salesforce Certified JavaScript Developer I) Exam is a certification exam that tests the candidate's knowledge and skills in JavaScript development on the Salesforce platform. JavaScript-Developer-I exam is designed for individuals who have experience in developing custom applications using JavaScript and are looking to enhance their skills and knowledge in Salesforce development. JavaScript-Developer-I exam covers various topics such as Apex, Visualforce, and Lightning Web Components.

Salesforce Certified JavaScript Developer I exam is a highly recognized certification that demonstrates a developer's ability to design, develop, and maintain custom applications using JavaScript in the Salesforce platform. Salesforce Certified JavaScript Developer I Exam certification exam is created to test the knowledge and skills of developers in areas like Apex, Visualforce, and Lightning components.

Salesforce Certified JavaScript Developer I (JS-Developer-I) Certification Exam is designed to evaluate the knowledge and skills of developers in building custom applications on the Salesforce platform using JavaScript. Salesforce Certified JavaScript Developer I Exam certification exam is intended for those developers who have a good understanding of JavaScript and its various frameworks and libraries. JavaScript-Developer-I Exam is also useful for developers who want to enhance their skills and knowledge in building custom applications on the Salesforce platform.

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Salesforce Certified JavaScript Developer I Exam Sample Questions (Q142-Q147):

NEW QUESTION # 142
Refer to the code below:

Which value can a developer expect when referencing country,capital,cityString?

  • A. undefined
  • B. 'London'
  • C. 'NaN'
  • D. An error

Answer: C


NEW QUESTION # 143
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
* Will establish a web socket connection and handle receipt of messages to the server
* Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?

  • A. try{
    ws.connect (( ) => {
    console.log('connected to client'); });
  • B. ws.on ('connect', ( ) => {
    console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
    });
  • C. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
  • D. ws.connect (( ) => {
    console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};

Answer: C

Explanation:
} catch(error) { console.log('ERROR' , error); };
}


NEW QUESTION # 144
Which javascript methods can be used to serialize an object into a string and deserialize
a JSON string into an object, respectively?

  • A. JSON.stringify and JSON.parse
  • B. JSON.parse and JSON.deserialize
  • C. JSON.serialize and JSON.deserialize
  • D. JSON.encode and JSON.decode

Answer: A


NEW QUESTION # 145
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?
A)

B)

C)

D)

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

Answer: C


NEW QUESTION # 146
Refer to the code below:
Async funct on functionUnderTest(isOK) {
If (isOK) return 'OK' ;
Throw new Error('not OK');
)
Which assertion accuretely tests the above code?

  • A. Console.assert (await functionUnderTest(true), ' not OK ')
  • B. Console.assert (await functionUnderTest(true), 'OK')
  • C. Console.assert (await functionUnderTest(true), ' not OK ')
  • D. Console.assert (await functionUnderTest(true), ' OK ')

Answer: B


NEW QUESTION # 147
......

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