Updated Free Salesforce JS-Dev-101 Test Engine Questions with 149 Q&As [Q60-Q80]

Q60. Refer to the following array:
let arr = [1, 2, 3, 4, 5];
Which two lines of code result in a second array, arr2, created such that arr2 is a reference to arr?

Q61. Refer to the code snippet:
Function getAvailabilityMessage(item) {
If (getAvailability(item)){
Var msg =”Username available”;
}
Return msg;
}
A developer writes this code to return a message to user attempting to register a new username. If the username is available, variable.
What is the return value of msg hen getAvailabilityMessage (“newUserName” ) is executed and getAvailability(“newUserName”) returns false?

Q62. A developer has a module that contains multiple functions.
What kind of export should be leveraged so that multiple functions can be used?

Q63. A developer creates a simple webpage with an input field. When a user enters text and clicks the button, the actual value must be displayed in the console:
HTML:
<input type=”text” value=”Hello” name=”input”>
<button type=”button”>Display</button>
JavaScript:
01 const button = document.querySelector(‘button’);
02 button.addEventListener(‘click’, () => {
03 const input = document.querySelector(‘input’);
04 console.log(input.getAttribute(‘value’));
05 });
When the user clicks the button, the output is always “Hello”.
What needs to be done to make this code work as expected?

Q64. Given the JavaScript below:
01 function filterDOM(searchString){
02 const parsedSearchString = searchString && searchString.toLowerCase();
03 document.querySelectorAll(‘.account’).forEach(account => {
04 const accountName = account.innerHTML.toLowerCase();
05 account.style.display = accountName.includes(parsedSearchString) ? /* Insert code here */;
06 });
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?

Q65. Refer to the code below:
let productSKU = ‘8675309’;
A developer has a requirement to generate SKU numbers that are always 19 characters long, starting with ‘sku’, and padded with zeros.
Which statement assigns the value sku000000008675309?

Q66. Which two code snippets show working examples of a recursive function?

Q67. A developer wrote a fizzbuzz function thatwhen passed in a number, returns the following:
* ‘Fizz’ if the number is divisible by 3.
* ‘Buzz’ if the number is divisible by 5.
* ‘Fizzbuzz’ if the number is divisible by both 3 and 5.
* Empty string if the number is divisible by neither 3 or 5.
Whichtwo test cases will properly test scenarios for the fizzbuzz function?
Choose 2 answers

Q68. static delay = async delay => {
return new Promise(resolve => {
setTimeout(resolve, delay);
});
};
static asyncCall = async () => {
await delay(1000);
console.log(1);
};
console.log(2);
asyncCall();
console.log(3);
Assume delay and asyncCall are in scope as functions.
What is logged to the console?

Q69. Refer to the code below (corrected to use a template literal on line 08):
01 let car1 = new Promise((_, reject) =>
02 setTimeout(reject, 2000, “Car 1 crashed in”)
03 );
04 let car2 = new Promise(resolve =>
05 setTimeout(resolve, 1500, “Car 2 completed”)
06 );
07 let car3 = new Promise(resolve =>
08 setTimeout(resolve, 3000, “Car 3 completed”)
09 );
10
11 Promise.race([car1, car2, car3])
12 .then(value => {
13 let result = `${value} the race.`;
14 })
15 .catch(err => {
16 console.log(“Race is cancelled.”, err);
17 });
What is the value of result when Promise.race executes?

Q70. Given the following code:
let x = (’15’ + 10) * 2;
What is the value of x?

Q71. Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
01 console.time(‘Performance’);
02
03 maybeAHeavyFunction();
04
05 thisCouldTakeTooLong();
06
07 orMaybeThisOne();
08
09 console.endTime(‘Performance’);
Which function can the developer use to obtain the time spent by every one of the three functions?

Q72. Refer to the followingcode:
class Vehicle{
constructor(plate){
this.plate = plate;
}
}
class Truck extends Vehicle{
constructor(plate, weight){
//Missing code
this.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 a weight of 5000lb.

Q73. Refer to the code below:
01 x = 3.14;
02
03 function myFunction() {
04 ‘use strict’;
05 y = x;
06 }
07
08 z = x;
09 myFunction();
Considering the implications of ‘use strict’ on line 04, which three statements describe the execution of the code?

Q74. Refer to the code below:
function changeValue(param) {
Param =5;
}
Let a =10;
Let b =5;
changeValue(b);
Const result = a+ ” – “+ b;
What is the value of result when code executes?

Q75. Code:
01 let array = [1, 2, 3, 4, 4, 5, 4, 4];
02 for (let i = 0; i < array.length; i++) {
03 if (array[i] === 4) {
04 array.splice(i, 1);
05 i–;
06 }
07 }
What is the value of array after execution?

Q76. Given the HTML below:

Which statement adds the priority-account css class to the Applied Shipping row?

Q77. Refer to the following array:
Let arr = [ 1,2, 3, 4, 5];
Which three options result in x evaluating as [3, 4, 5] ?
Choose 3 answers.

Q78. Refer to the code below:
let inArray = [ [1, 2], [3, 4, 5] ];
Which two statements result in the array [1, 2, 3, 4, 5]?
(With corrected typing errors: usArray → inArray, .. → ….)

Q79. Refer to code below:
function Person() {
this.firstName = ‘John’;
}
Person.prototype ={
Job: x => ‘Developer’
};
const myFather = new Person();
const result=myFather.firstName + ‘ ‘ + myFather.job();
What is the value of the result after line 10 executes?

Q80. Refer to code below:
Function muFunction(reassign){
Let x = 1;
var y = 1;
if( reassign ) {
Let x= 2;
Var y = 2;
console.log(x);
console.log(y);}
console.log(x);
console.log(y);}
What is displayed when myFunction(true) is called?