Higher Test Marks with Free Online DEX602 Exam Practice

Assess the CertsIQ’s updated DEX602 exam questions for free online practice of your Program Lightning Web Components test. Our Javascript-Developer-I DEX-602 dumps questions will enhance your chances of passing the Javascript Developer certification exam with higher marks.

Exam Code: DEX602
Exam Questions: 217
Program Lightning Web Components
Updated: 16 Oct, 2025
Question 1

Given the JavaScript below:9Which code should replace the placeholder comment on line 05 to highlight accounts that match the search string'

Options :
Answer: D

Question 2

Which function should a developer use to repeatedly execute code at a fixed interval ?

Options :
Answer: A

Question 3

A developer has two ways to write a function:Option A:function Monster(){this.growl = ()=>{console.log('Grr!');}}Option B:function Monster(){};Monster.prototype.growl = ()=>{console.log('Grr!');}After deciding on an option, the developer creates 1000 monster objects.How many growl methods are created with Option A and Option B?

Options :
Answer: B

Question 4

A developer is creating a simple webpage with a button. When a user clicks this buttonfor the first time, a message is displayed.The developer wrote the JavaScript code below, but something is missing. Themessage gets displayed every time a user clicks the button, instead of just the first time.01 function listen(event) {02 alert ( 'Hey! I am John Doe') ;03 button.addEventListener ('click', listen);Which two code lines make this code work as required?Choose 2 answers

Options :
Answer: C,D

Question 5

Refer to the following code:class Vehicle{constructor(plate){this.plate = plate;}}class Truck extends Vehicle{constructor(plate, weight){//Missing codethis.weight = weight;}displayWeight(){console.log(`The truck ${this.plate} has a weight of ${this.weight}lb.`);}}let myTruck = new Truck('123Ab',5000);myTruck.displayWeight();Which statement should be added to missing code for the code to display 'The truck 123AB has aweight of 5000lb.

Options :
Answer: A

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