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Salesforce Certified JavaScript Developer I Exam Questions
Salesforce Certified JavaScript Developer I (Page 5 )

Updated On: 10-Mar-2026
Page 5 of 46
PDF with 224 Questions

A developer wants to iterate through an array of objects and count the objects and count the objects whose property value, name, starts with the letterN. Const arrObj = [{"name" : "Zach"} , {"name" : "Kate"},{"name" : "Alise"},{"name" : "Bob"},{"name" :
"Natham"},{"name" : "nathaniel"}
Refer to the code snippet below:
01 arrObj.reduce(( acc, curr) => {
02 //missing line 02
02 //missing line 03
04 ). 0);
Which missing lines 02 and 03 return the correct count?

  1. Const sum = curr.startsWith(`N') ? 1: 0;Return acc +sum
  2. Const sum = curr.name.startsWith(`N') ? 1: 0;Return acc +sum
  3. Const sum = curr.startsWIth(`N') ? 1: 0;Return curr+ sum
  4. Const sum =curr.name.startsWIth(`N') ? 1: 0;Return curr+ sum

Answer(s): B



A developer creates a class that represents a blog post based on the requirement that a Post should have a body author and view count.
The Code shown Below:
Class Post{

// Insert code here
This.body =body
This.author = author;
this.viewCount = viewCount;
}
}
Which statement should be inserted in the placeholder on line 02 to allow for a variable to be set to a new instanceof a Post with the three attributes correctly populated?

  1. super (body, author, viewCount) {
  2. Function Post (body, author, viewCount) {
  3. constructor (body, author, viewCount) {
  4. constructor() {

Answer(s): C



Which three options show valid methods for creating a fat arrow function? Choose 3 answers

  1. x => ( console.log(` executed ') ; )
  2. [ ] => ( console.log(` executed ') ;)
  3. ( ) => ( console.log(` executed ') ;)
  4. X,y,z => ( console.log(` executed ') ;)
  5. (x,y,z) => ( console.log(` executed ') ;)

Answer(s): A,E



Refer to the code below:
const event = new CustomEvent(

//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this? Choose 2 answers

  1. `Update' , (recordId : `123abc'(
  2. `Update' , `123abc'
  3. { type : `update', recordId : `123abc' }
  4. `Update' , {Details : {recordId : `123abc'}}

Answer(s): A,D



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

  1. Double
  2. Number
  3. Decimal
  4. Float

Answer(s): B



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Viewing questions 21 - 25 out of 224 questions



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