Latest JavaScript-Developer-I Study Guides 2023 - With Test Engine PDF
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Salesforce JavaScript-Developer-I certification exam is a multiple-choice exam that measures the candidate's knowledge of JavaScript development principles, best practices, and techniques specific to the Salesforce platform. JavaScript-Developer-I exam consists of 60 multiple-choice questions, and candidates have 105 minutes to complete it. JavaScript-Developer-I exam is available in English and Japanese and can be taken online or in-person at a proctored testing center.
NEW QUESTION # 123
A developer wants to create a simple image upload in the browser using the File API. The HTML is below:
The JavaScript portion is:
In lines 04 and 08, which code allows the user to select an image from their local computer, and to display the image in the browser?
- A. 04 const reader = new File ( ) ;
08 if (file) ,reader, readerAsDataURL (file) ; - B. 04 const reader = new FileReader ( ) ;
08 if (file) reader , createAsDataURL (file) ; - C. 04 const reader = new FileReader ( ) ;
08 if (file) URL , createObjectURL (file) ; - D. 04 const reader = new File ( ) ;
08 if (file) URL , createObjectURL (file) ;
Answer: D
NEW QUESTION # 124
Refer to code below:
console.log(0);
setTimeout(() => (
console.log(1);
});
console.log(2);
setTimeout(() => {
console.log(3);
), 0);
console.log(4);
In which sequence will the numbers be logged?
- A. 0
- B. 02431
- C. 02413
- D. 01234
Answer: C
NEW QUESTION # 125
Refer the code below.
x=3.14;
function myfunction() {
"use strict";
y=x;
}
z=x;
myFunction();
Answer:
Explanation:
See the Answer below in explanation:
Explanation
Z is equal to 3.14
Use strict has effect only on line 5.
Line 5 throws an error
NEW QUESTION # 126
A developer is creating a simple webpage with a button. When a user clicks this button
for the first time, a message is displayed.
The developer wrote the JavaScript code below, but something is missing. The
message 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
- A. On line 02, use event.first to test if it is the first execution.
- B. On line 06, add an option called once to button.addEventListener().
- C. On line 04, use event.stopPropagation ( ),
- D. On line 04, use button.removeEventListener(' click" , listen);
Answer: B,D
NEW QUESTION # 127
Given the code below:
What happens when the code executes?
- A. The ur1 variables has local scope and line 02 throws an error.
- B. The ur1 variable has global scope and line 02 throws an error.
- C. The ur1 variable has local scope and line 02 executes correctly.
- D. The ur1 variable has global scope and line 02 executes correctly.
Answer: D
NEW QUESTION # 128
Which code statement correctly retrieves and return an object from localStorage?
A)
B)
C)
D)
- A. Option A
- B. Option D
- C. Option B
- D. Option C
Answer: B
NEW QUESTION # 129
A developer has an ErrorMandler module that contains multiple functions.
What kind of export should be leveraged so that multiple function can be used?
- A. Named
- B. Multi
- C. default
- D. All
Answer: A
NEW QUESTION # 130
A developer removes the HTML class attributes from the check button, so now it is simply:
<button>checkout<button>.
There is a test verify the existence of the checkout button, however it look for a button with class'' blue''. The test fails because no such button is f.
Which type of test category describes this test?
- A. False negative
- B. True positive
- C. True negative
- D. False positive
Answer: B
NEW QUESTION # 131
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below:
All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.
- A. Use the DOM inspector to prevent the load event to be fired.
- B. Use the browser to execute a script that removes all the element containing the class ad-library-item.
- C. Use the browser console to execute a script that prevents the load event to be fired.
- D. Use the DOM inspector to remove all the elements containing the class ad-library-item.
Answer: B
NEW QUESTION # 132
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?
- A. > 5 >undefined
- B. > true > false
- C. > 5 > -1
- D. > 5 > 0
Answer: A
Explanation:
NEW QUESTION # 133
Given the following code:
document.body.addEventListener(' click ', (event) => {
if (/* CODE REPLACEMENT HERE */) {
console.log('button clicked!');
)
});
Which replacement for the conditional statement on line 02 allows a developer to
correctly determine that a button on page is clicked?
- A. event.target.nodeName == 'BUTTON'
- B. button.addEventListener('click')
- C. e.nodeTarget ==this
- D. Event.clicked
Answer: A
NEW QUESTION # 134
A developer creates a simple webpage with an input field. When a user enters text in the input field and clicks the button, the actual value of the field must be displayed in the console.
Here is the HTML file content:
<input type =" text" value="Hello" name ="input">
<button type ="button" >Display </button> The developer wrote the javascript code below:
Const button = document.querySelector('button');
button.addEvenListener('click', () => (
Const input = document.querySelector('input');
console.log(input.getAttribute('value'));
When the user clicks the button, the output is always "Hello".
What needs to be done to make this code work as expected?
- A. Replace line 04 with console.log(input .value);
- B. Replace line 02 with button.addCallback("click", function() {
- C. Replace line 03 with const input = document.getElementByName('input');
- D. Replace line 02 with button.addEventListener("onclick", function() {
Answer: A
NEW QUESTION # 135
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array. The test passes:
A different developer made changes to the behavior of sum3 to instead sum all of the number present In the array.
Which two results occur when running the test on the updated sum3 function?
Choose 2 answers
- A. The line 02 assertion passes.
- B. The line 05 assertion fails.
- C. The line 02 assertion fails.
- D. The line 05 assertion passes.
Answer: A,B
NEW QUESTION # 136
Refer to the code below:
Let searchString = ' Look for this ';
Which two options remove the whitespace from the beginning of searchString? Choose 2 answers
- A. trimStart (searchString) ;
- B. searchString. trimEnd ( ) ;
- C. searchString. trimstart ( ) ;
- D. searchString. Replace (/^\a\a'/' ' ') ;
Answer: C,D
NEW QUESTION # 137
Given the JavaScript below:
Which code should replace the placeholder comment on line 05 to highlight accounts that match the search string'
- A. 'none1 : "yellow'
- B. 'yellow : 'none'
- C. null : 'yellow'
- D. 'yellow' : null
Answer: B
NEW QUESTION # 138
developer wants to use a module named universalContainersLib and them call functions
from it.
How should a developer import every function from the module and then call the fuctions foo
and bar ?
- A. import (foo, bar) from '/path/universalContainersLib.js';
foo();
bar(); - B. import all from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar(); - C. import * ad lib from '/path/universalContainersLib.js';
lib.foo();
lib.bar(); - D. import * from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();
Answer: C
NEW QUESTION # 139
......
To prepare for the Salesforce JavaScript-Developer-I Exam, candidates should have a strong foundation in programming and JavaScript development, as well as experience working with the Salesforce platform. They can also take advantage of a range of study resources provided by Salesforce, including study guides, practice exams, and training courses. By investing the time and effort to prepare for the exam, developers can improve their skills and knowledge, and demonstrate their expertise to potential employers and clients.
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