Verified JavaScript-Developer-I Exam Dumps Q&As - Provide JavaScript-Developer-I with Correct Answers
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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:
- Front end developer
- Support engineer
- Technical Product Manager
- Full stack developer
- Salesforce developer
- UI/UX Engineer
- JavaScript programmer
- Technical Project Manager
- Software/backend developer
- Web application developer
NEW QUESTION 81
Which three statements are true about promises?
The executor of a new promise runs automatically.
- A. A pending promise can become fulfilled, settled or rejected.
- B. A settled promises can become resolved.
- C. A promise has a . then 90 method.
- D. A fulfilled or rejected promise will not change states.
Answer: B,C,D
NEW QUESTION 82
Refer to the code below:
Which code executes syhello once, two minutes from now?
- A. SetTimeout (sayhello( ), 120000) ;
- B. SetInterval (sayhello, 120000) ;
- C. SetTimeout (sayhello, 120000) ;
- D. delay (sayhello, 120000) ;
Answer: A
NEW QUESTION 83
A developer wants to set up a secure web server with Node.js. The developer create a directory locally called app-server, and the first file is app-server/index, js.
Without using any third-party libraries, what should the developer add to index, js to create the secure web server?
- A. Const http = require ('http');
- B. Const http = require ('https') ;
- C. Const tls = require ('tls') ;
- D. Const server = require ( 'secure-server') ;
Answer: B
NEW QUESTION 84
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
Will establish a web socket connection and handle receipt of messages to the server Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?
- A. ws.connect (( ) => {
console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }}; - B. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
- C. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
}); - D. try{
ws.connect (( ) => {
console.log('connected to client'); });
} catch(error) { console.log('ERROR' , error); };
}
Answer: B
NEW QUESTION 85
A developer has a formatName function that takes two arguments, firstName and lastName and returns a string. They want to schedule the function to run once after five seconds.
What is the correct syntax to schedule this function?
- A. setTimeout (formatName('John', ''Doe'), 5000);
- B. setTimout(() => { formatName("John', 'Doe') }, 5000);
- C. setTimeout (formatName(), 5000, "John", "BDoe");
- D. setTimeout ('formatName', 5000, 'John", "Doe');
Answer: D
NEW QUESTION 86
Teams at Universal Containers (CU) work on multiple JavaScript projects at the same time. UC us thinking about reusability and how each team can benefit from the work of others.
Going open-source or public is not an option at this time.
Which option is available to UC with npm?
- A. Private registries are not supported by spm, but packages can be installed vis URL.
- B. Private packages can be scoped, and scopes can be associated to a private registries.
- C. Private packages are not supported, but they can use another package manager like yarm.
- D. Private register are not supported by npm, but packages can be installed via git.
Answer: C
NEW QUESTION 87
Given two expressions var1 and var2, what are two valid ways to return the logical AND of the two expression and ensure it is data type Boolean? Choose 2 answers
- A. Var1 && var2
- B. Var1. Toboolean ( ) && var2, to Boolean ( )
- C. Boolean (var1 && var2)
- D. Boolean (var1) && Boolean (var2)
Answer: B,C
NEW QUESTION 88
A developer creates an object where its properties should be immutable and prevent properties from being added or modified.
Which method should be used to execute this business requirement?
- A. Object. filebase ( )
- B. Object. Lock ( )
- C. Object const ( )
- D. Object. real ( )
Answer: A
NEW QUESTION 89
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 = Array.from(arr1);
- B. Let arr2 = arr1.slice(0, 5);
- C. Let arr2 = arr1.sort();
- D. Let arr2 = arr1;
Answer: A,B
NEW QUESTION 90
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)
- A. Option C
- B. Option A
- C. Option B
- D. Option D
Answer: B
NEW QUESTION 91
Refer to the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));
When does Promise.finally on line 08 get called?
- A. When rejected
- B. When resolved and settled
- C. When resolved or rejected
- D. WHen resolved
Answer: C
NEW QUESTION 92
Refer to the following code that performs a basis mathematical operation on a provided input:
How should line o2 be written to ensure that x evaluated to 6 in the line below?
Let x calculate (''g'');
- A. Return Number (num + 10) / 3;
- B. Return Number (num + 10) / 3;
- C. Return integer (num + 10) / 3;
- D. Return Number (num) + 10) / 3);
Answer: D
NEW QUESTION 93
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
* Will establish a web socket connection and handle receipt of messages to the server
* Will be imported with require, and made available with a variable called ws.
The developer also wants to add error logging if a connection fails.
Given this information, which code segment show the correct way to set up a client two events that listen at execution time?
A)
B)
C)
D)
- A. Option A
- B. Option C
- C. Option B
- D. Option D
Answer: D
NEW QUESTION 94
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. A popstate event is fired with a state properly that details the application's last state.
- B. The page is navigated away from and previous page in the browser's history is loaded.
- C. A navigate event is fired with a state properly that details previous application state.
- D. The page reloads and all JavaScript is reinitialized.
Answer: B
NEW QUESTION 95
Which statement accurately describes the behavior of the async /swait keywords?
- A. The associated class contains some asynchronous functions.
- B. The associated function will always return a promise.
- C. The associated function can only be called via asynchronous methods.
- D. The associated function sometimes returns a promise.
Answer: B
NEW QUESTION 96
Refer to the following code that imports a module named Utills,
Which two implementations of Utill, je export foo and bar such that the code above runs without error?
Choose 2 answers
- A. //FooUtill.js and barUtils, js exist
Import (foo) from ,/Path/footUtils.js,:
Export (foo, bar) - B. Const foo = ( ) => ( return 'foo; ; )
Const bar => => { return 'bar ';}
Export default foo, bar; - C. Const foo = () => ( return 'foo ' ; )
Const bar => ( return 'bar' ; )
Export (foo, bar) - D. Export default class (
Foo ( ) ( return 'foo ,; )
Bar ( ) ( return ;bar ; )
Answer: D
NEW QUESTION 97
Refer to the code below:
Considering the implementations of 'use strict' on line 04, which three statements describes the executes of the code? Choose 3 answers
- A. 'use strict' has an effect only on line 05.
- B. 'use strict' has an effect between line 04 and the end of the file.
- C. Z is equal to 3,14.
- D. 'use strict , is hoisted, so it has an effect on all lines.
- E. Line 05 throws an error.
Answer: C,D,E
NEW QUESTION 98
Refer to the code below:
Which code change should be made for the console to log only Row log when 'Click mel' is clicking?
- A. Add event,stopPropagation (); to printMessage function.
- B. Add event,stopPropagation (); to printMessage function.
- C. Add event,stopPropagation (); to window,onLoad event hadler.
- D. Add event,stopPropagation (); to window.onLoad event hadler.
Answer: A,D
NEW QUESTION 99
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 browser to execute a script that removes all the element containing the class ad-library-item.
- B. Use the DOM inspector to remove all the elements 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 prevent the load event to be fired.
Answer: A
NEW QUESTION 100
......
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.
Conversion type (inclusive versus explicit)
Scope of Variables
Functions (more functions in higher order)
Classes
JavaScript on the backend
Strings
Discharge
Control of Mistake
Forms of data and operators
Objects & Arrays: Data Structures
Monitor (agnostic platform)
Asynchronous Programming
Item Model Document
Activities
Modules
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.
Topics of Salesforce JavaScript Developer I Exam
Aspirants must know the exam topics before they start of preparation. Because it will help them to prepare for the below concepts Salesforce JavaScript-Developer-I exam will include the following topics:
1. Variable, Types, and Collection: 23%
Scenario based coding Variables Creation and Initialization JSON object understanding
2. Object, Functions, and Classes: 25%
Implementation of different functions Understanding of different modules of Javascript Scope of variables and their execution flow
3. Browser and Events: 17%
Handling and propagation of events Development tools of browsers Understanding of browser specific APIs
4. Asynchronous Programming: 13%
Asynchrounous programming different concepts Monitoring and management of different loops
5. Server Side Javascript: 8%
Implementation of Node.js Understanding of Node.js CLI commands
6. Testing: 7%
Unit Testing effectiveness of different tests
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