Prepare JavaScript-Developer-I Question Answers - JavaScript-Developer-I Exam Dumps [Q85-Q110]

Prepare JavaScript-Developer-I Question Answers - JavaScript-Developer-I Exam Dumps

Real Salesforce JavaScript-Developer-I Exam Questions [Updated 2021]

Who should take the Salesforce JavaScript-Developer-I Exam

This course is designed for Javascript developers starting on the Salesforce platform who require programming customizations on front-end and back-end. There are no prerequisites for Salesforce JavaScript Developer I Exam. Typical job roles that align to the Salesforce Certified JavaScript Developer I are as follows:

Technical Project Manager
Web application developer
JavaScript programmer
Salesforce developer
Software/backend developer

How to Study the Salesforce JavaScript-Developer-I Exam

The best study material one can get is the JavaScript-Developer-I practice dumps. To ensure good grades, do attempt the JavaScript-Developer-I practice tests. The JavaScript Developer I from Salesforce typically has 1-2 years of experience as a JavaScript developer with the following JavaScript topics.

Monitor (agnostic platform)
Conversion type (inclusive versus explicit)
Modules
Classes
Objects & Arrays: Data Structures
Asynchronous Programming
Control of Mistake
Functions (more functions in higher order)
Forms of data and operators
Discharge
Activities

To prepare for this test, we advise a combination of practical experience, completion of training courses, pathways and self-study in the areas listed in the examination outline section of this examination guide.

NEW QUESTION 85
Refer to the HTML below:

Which expression outputs the screen width of the element with the ID card-01?

A. Documents.getElementById( 'card-01') . InnerHTML. Length.6
B. Documents.getElementById( 'card-01') .getBoundingClientRect () .width
C. Documents.getElementById( 'card-01') . style,width
D. Documents.getElementById( 'card-01') . width

Answer: B

NEW QUESTION 86
A developer is debugging a web server that uses Node.js. The server hits a runtime error every third request to an important endpoint on the web server.
The developer added a break point to the start script, that is at index, js at the root of the server's source code. The developer wants to make use of Chrome DevTools to debug.
Which command can be run to access DevTools and make sure the breakpoint is hit?

A. Node --inspect -brk index , js
B. Node -- inspect index ,js
C. Node inspect index , js
D. Node -I index , js

Answer: B

NEW QUESTION 87
A developer wants to create an object from a function in the browser using the code below.
What happens due to lack of the new keyword on line 02?

A. The n variable is assigned the correct object but this- remains undefined.
B. Window. === name is assigned to ''hello'' and the variable a n remain undefined.
C. Window. n is assigned the correct object.
D. The a variable is assigned the correct object.

Answer: B

NEW QUESTION 88
A developer implements and calls the following code when an application state change occurs:

If the back button is clicked after this method is executed, what can a developer expect?

A. The page is navigated away from and previous page in the browser's history is loaded.
B. The page reloads and all JavaScript is reinitialized.
C. A popstate event is fired with a state properly that details the application's last state.
D. A navigate event is fired with a state properly that details previous application state.

Answer: A

NEW QUESTION 89
A developer wrote the following code:

The developer has a getNextValue function to execute after handleObjectvalue ( ), but does not want to execute getNextValues ( ) If an error occurs.
How can the developer change the code to ensure this behavior?
A)

B)

C)

A. Option B
B. Option C
C. Option A
D. Option D

Answer: D

NEW QUESTION 90
A developer creates a simple webpage with an input filed. 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:

The developer wrote the JavaScript code below:

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 04 with button, addCallback (''click'', function ( ) (
C. Replace line 04 with const input = document. getElementByName ('input') ;
D. Replace line 04 with button.addEventListener (''onclick'', function ( ) (

Answer: A

NEW QUESTION 91
Cloud Kicks has a class to represent item for sale in an online store, as shown below:

A new business requirement comes in that request a clothingitem class, that should have all of the properties and methods of the item class, but will also have properties that are specific top clothes.
Which line of code properly declares the clothingitem class such that it inherits from item?

A. Class clothing item super item (
B. Class Clothingitem (
C. Class clothingitem extends item (
D. Class clothingitem implements item (

Answer: C

NEW QUESTION 92
Refer to the code below:

What is the value of result when Promise. race executes?

A. Car 1 crashed the race
B. Car 3 completed the race
C. Car 2 completed the race
D. Race is cancelled.

Answer: A

NEW QUESTION 93
A developer has two ways to write a function:

After deciding on an option, the developer creates 1000 monster objects.
How many growl methods are created with Option A and Option B?

A. 1 growl method is created regardless of which option is used.
B. 1000 growl methods are created for Option A. 1 growl method is created for Option B.
C. 1 growl method is created for Option A. 1000 growl methods are created for Option B.
D. 1000 growl methods are created regardless of which option is used.

Answer: B

NEW QUESTION 94
A developer wants to leverage a module to print a price in pretty format, and has imported a method as shown below:
Import printPrice from '/path/PrincePrettyPrint. Js';
Based on the code, what must be true about the printPrice function of the PricePrettyPrint modules for this import to work?

A. printPrice must be an default export
B. printPrice must be named export
C. printPrice must be an all export
D. printPrice must be a multi export

Answer: B

NEW QUESTION 95
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];

Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?

A. Let arr2 = arr1.sort();
B. Let arr2 = arr1;
C. Let arr2 = Array.from(arr1);
D. Let arr2 = arr1.slice(0, 5);

Answer: C,D

NEW QUESTION 96
A developer creates a class that represents a blog post based on the requirements that a Post should have a body, author, and view count. The code is shown below:

Which statement should be inserted in the placeholder on line 02 to allow for a variable to be sent to a new instance of a port with the three attributes correctly populated?

A. Constructor ( ) (
B. Constructor (body, author, viewCount) (
C. Super (body, author, viewCount) (
D. Function Post (body, author, viewCount) (

Answer: B

NEW QUESTION 97
A developer needs to test this functions:

Which two assert statements are valid tests for this function?

A. Console.assert(sum3 ([-3, 2]) -1) ;
B. Console.assert(sum3((1, '2' ]) 12 );
C. Console.assert(sum3([0]) 0) ;
D. Console.assert(sum3 (['hello' 2, 3, 4]) NaN);

Answer: A,B

NEW QUESTION 98
Refer to the HTML below:

Which JavaScript statement results in changing ''Tony'' to ''Mr. T. ''?

A. Document.querySelector (' '#main li:second-child') innerHTML, = Mr, T, ';
B. Document.querySelector (''#main li:nth-child (2) ') , innerHTML = 'Mr . T ';
C. Document.querySelectorAll ('#main # TONY ') , innerHTML = Mr, T , ' ;
D. Document.querySelectorAll ( '#main li, Tony ' ) innerHTNL = Mr, T , ' ;

Answer: C

NEW QUESTION 99
A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current dat. 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's date + 9 days.
Which code meets this new requirements?

A. deliveryDate. setDate (( new Date ()) .getDate () + 9);
B. deliveryDate. setDate ( Date . current () + 9 0;
C. deliveryDate. Date = new Date (+9) ;
D. deliveryDate . date = date . current () + 9

Answer: A

NEW QUESTION 100
Refer to the code below:

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

A. {type ; update ', recordId : '123abc')
B. 'update', {
Detail ; {
recordId, '123abc
)
)
C. 'update', ( recordId ; 123abc'
)
D. 'update' , '123abc'

Answer: B,C

NEW QUESTION 101
Refer to the code below:

After running this code, which result is displayed on the console?

A. > 5
> Undefined
B. > 5
>- 1
C. > True
> False
D. > 5
> 0

Answer: B

NEW QUESTION 102
A developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information the developer has, which code logs an error at boot time with an event?
A)

B)

C)

D)

A. Option C
B. Option B
C. Option D
D. Option A

Answer: A

NEW QUESTION 103
A developer wants to use a module named universalContainerLib and then call functions from it.
How should a developer import every function from the module and then call the functions foo and bar?

A. import + from '/path/universalContainerLib.js''
universalContainersLib.foo( ) ;
universalContainersLib bar ( ) :
B. import (foo,bar) from '/path/universalContainerLib.js''
foo ( ) ;
bar ( ) ;
C. import all from '/path/universalContainerLib.js''
universalContainersLib.foo( ) ;
universalContainersLib bar ( ) :
D. import - as lib from '/path/universalContainerLib.js''
lib.foo( ) ;
lib. bar ( ) ;

Answer: D

NEW QUESTION 104
Refer to the code below:

Which assertion accurately tests the above code?

A. Console, assert (functionalUnderTest (true) , 'ok')
B. Console, assert ( await functionalUnderTest (true) , 'ok
C. Console, assert ( await functionalUnderTest (true) , 'not ok' )
D. Console, assert ( await functionalUnderTest (true) , 'not ok) )

Answer: A

NEW QUESTION 105
Given the code below:

What is the expected output?

A. Line 08 throws an error, therefore line 09 is never executed.
B. Both lines 08 and 09 are executed, and the variables are outputted.
C. Line 08 outputs the variable, but line 09 throws an error.
D. Both lines 06 and 09 are executed, but the values outputted are undefined.

Answer: C

NEW QUESTION 106
Which statement accurately describes the behavior of the async /swait keywords?

A. The associated function sometimes returns a promise.
B. The associated function can only be called via asynchronous methods.
C. The associated class contains some asynchronous functions.
D. The associated function will always return a promise.

Answer: D

NEW QUESTION 107
What are two unique feature of function defined with a fat arror as compared to normal functional definition?
Choose 2 answers

A. The function uses the this from the enclosing scope.
B. The function receives an argument that is always in scope, called parent this, which is the enclosing lexical scope
C. If the function has a single expression in the function body, the expression will be evaluated and implicitly returned.
D. The function generation its own this making it useful for separating the function's scope its enclosing scope

Answer: C

NEW QUESTION 108
Given the following code:

is the output of line 02?

A. ''undefined''
B. ''x''
C. ''null'''
D. ''object''

Answer: D

NEW QUESTION 109
Refer to the code below:

A developer uses a client that makes a GET request that uses a promise to handle the request, getRequest returns a promise.
Which code modification can the developer make to gracefully handle an error?
A)

B)

C)

D)