Free Salesforce JS-Dev-101 Exam Questions

Become Salesforce Certified with updated JS-Dev-101 exam questions and correct answers

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Total 217 Questions | Updated On: Jun 17, 2026

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Question 1

A developer at Universal Containers creates a new landing page based on HTML, CSS, andJavaScript TO ensure that visitors have a good experience, a script named personaliseContextneeds to be executed when the webpage is fully loaded (HTML content and all related files ), inorder to do some custom initialization.Which statement should be used to call personalizeWebsiteContent based on the abovebusiness requirement?

A : document.addEventListener(''onDOMContextLoaded', personalizeWebsiteContext);

B : window.addEventListener('load',personalizeWebsiteContext);

C : window.addEventListener('onload', personalizeWebsiteContext);Document.addEventListener('''DOMContextLoaded' , personalizeWebsiteContext);

D : Document.addEventListener('''DOMContextLoaded' , personalizeWebsiteContext);

Answer: B

Question 2

Refer to the code below:Const pi = 3.1415326,What is the data type of pi?

A : Double

B : Number

C : Decimal

D : Float

Answer: B

Question 3

A developer is working on an ecommerce website where the delivery date is dynamicallycalculated based on the current day. The code line below is responsible for this calculation.Const deliveryDate = new Date ();Due to changes in the business requirements, the delivery date must now be today'sdate + 9 days.Which code meets this new requirement?

A : deliveryDate.setDate(( new Date ( )).getDate () +9);

B : deliveryDate.setDate( Date.current () + 9);

C : deliveryDate.date = new Date(+9) ;

D : deliveryDate.date = Date.current () + 9;

Answer: A

Question 4

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 :