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Certified JavaScript Developer I: Salesforce Certified JavaScript Developer I

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Last Updated
February - 2025
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English
6 Quizzes
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The Certified JavaScript Developer I exam is a crucial step for anyone looking to validate their expertise in JavaScript development. To increase your chances of success, practicing with real exam questions shared by those who have already passed can be incredibly helpful. In this guide, we’ll provide practice test questions and answers, offering insights directly from successful candidates.

Why Use Certified JavaScript Developer I Practice Test?

  • Real Exam Experience: Our practice tests accurately mirror the format and difficulty of the actual Certified JavaScript Developer I exam, providing you with a realistic preparation experience.
  • Identify Knowledge Gaps: Practicing with these tests helps you pinpoint areas that need more focus, allowing you to study more effectively.
  • Boost Confidence: Regular practice builds confidence and reduces test anxiety.
  • Track Your Progress: Monitor your performance to see improvements and adjust your study plan accordingly.

Key Features of Certified JavaScript Developer I Practice Test

  • Up-to-Date Content: Our community regularly updates the questions to reflect the latest exam objectives and industry trends.
  • Detailed Explanations: Each question comes with detailed explanations, helping you understand the correct answers and learn from any mistakes.
  • Comprehensive Coverage: The practice tests cover all key topics of the Certified JavaScript Developer I exam, including ES6, JavaScript frameworks, and asynchronous programming.
  • Customizable Practice: Tailor your study experience by creating practice sessions based on specific topics or difficulty levels.

Exam Details

  • Exam Number: JavaScript Developer I
  • Exam Name: Certified JavaScript Developer I Exam
  • Length of Test: 90 minutes
  • Exam Format: Multiple-choice and scenario-based questions
  • Exam Language: English
  • Number of Questions in the Actual Exam: 60 questions
  • Passing Score: 70%

Use the member-shared Certified JavaScript Developer I Practice Tests to ensure you're fully prepared for your certification exam. Start practicing today and take a significant step towards achieving your certification goals!

Related questions

Question 1

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myArraym can have one level, two levels, or more levels.

Which statement flattens myArray when it can be arbitrarily nested?

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Question 2

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Refer to the code below:

let sayHello = () => {

console.log ('Hello, world!');

};

Which code executes sayHello once, two minutes from now?

setTimeout(sayHello, 12000);
setTimeout(sayHello, 12000);
setInterval(sayHello, 12000);
setInterval(sayHello, 12000);
setTimeout(sayHello(), 12000);
setTimeout(sayHello(), 12000);
delay(sayHello, 12000);
delay(sayHello, 12000);
Suggested answer: A
asked 23/09/2024
Robert Aghten
34 questions

Question 3

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Given the code below:

const delay = sync delay => {

Return new Promise((resolve, reject) => {

setTimeout (resolve, delay);});};

const callDelay =async () =>{

const yup =await delay(1000);

console.log(1);

What is logged to the console?

1 2 3
1 2 3
1 3 2
1 3 2
2 1 3
2 1 3
2 3 1
2 3 1
Suggested answer: D
asked 23/09/2024
Jaques Rautenbach
36 questions

Question 4

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Refer to the code below:

01 const server = require('server');

02 /* Insert code here */

A developer imports a library that creates a web server. The imported library uses events and callbacks to start the servers Which code should be inserted at the line 03 to set up an event and start the web server ?

Server.start ();
Server.start ();
server.on(' connect ' , ( port) => { console.log('Listening on ' , port) ;})
server.on(' connect ' , ( port) => { console.log('Listening on ' , port) ;})
server()
server()
serve(( port) => (
serve(( port) => (
console.log( 'Listening on ', port) ;
console.log( 'Listening on ', port) ;
Suggested answer: B
asked 23/09/2024
adnan ayyash
43 questions

Question 5

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Given the expressions var1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is string? Choose 2 answers

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Question 6

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Refer to the following code:

<html lang="en">

<body>

<div onclick = "console.log('Outer message') ;">

<button id ="myButton">CLick me<button>

</div>

</body>

<script>

function displayMessage(ev) {

ev.stopPropagation();

console.log('Inner message.');

}

const elem = document.getElementById('myButton');

elem.addEventListener('click' , displayMessage);

</script>

</html> What will the console show when the button is clicked?

Outer message
Outer message
Outer messageInner message
Outer messageInner message
Inner messageOuter message
Inner messageOuter message
Inner message
Inner message
Suggested answer: D
asked 23/09/2024
Abbas Jabbari
42 questions

Question 7

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Refer to the code below:

Async funct on functionUnderTest(isOK) {

If (isOK) return 'OK' ;

Throw new Error('not OK');

)

Which assertion accurately tests the above code?

Console.assert (await functionUnderTest(true), ' OK ')
Console.assert (await functionUnderTest(true), ' OK ')
Console.assert (await functionUnderTest(true), ' not OK ')
Console.assert (await functionUnderTest(true), ' not OK ')
Console.assert (await functionUnderTest(true), ' not OK ')
Console.assert (await functionUnderTest(true), ' not OK ')
Console.assert (await functionUnderTest(true), 'OK')
Console.assert (await functionUnderTest(true), 'OK')
Suggested answer: D
asked 23/09/2024
Nivi Kolatte
39 questions

Question 8

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Refer to the code below:

01 let car1 = new promise((_, reject) =>

02 setTimeout(reject, 2000, "Car 1 crashed in"));

03 let car2 = new Promise(resolve => setTimeout(resolve, 1500, "Car 2 completed")); 04 let car3 = new Promise(resolve => setTimeout (resolve, 3000, "Car 3 Completed")); 05 Promise.race([car1, car2, car3]) 06 .then(value => ( 07 let

result = $(value) the race. `; 08 )) 09 .catch( arr => ( 10 console.log("Race is cancelled.", err); 11 )); What is the value of result when Promise.race executes?

Car 3 completed the race.
Car 3 completed the race.
Car 1 crashed in the race.
Car 1 crashed in the race.
Car 2 completed the race.
Car 2 completed the race.
Race is cancelled.
Race is cancelled.
Suggested answer: C
asked 23/09/2024
samer salami
34 questions

Question 9

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Given the code below:

Salesforce Certified JavaScript Developer I image Question 189 63860 09232024002545000000

What is logged to the console'

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Question 10

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Considering the implications of 'use strict' on line 04, which three statements describe the execution of the code?

Choose 3 answers

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