Free Salesforce Developer JavaScript-Developer-I Ultimate Study Guide (Updated 215 Questions)
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Introduction to Salesforce JavaScript Developer I Exam
The credential Salesforce Accredited JavaScript Developer I is meant for applicants who build JavaScript applications for the web stack on the front-end and/or back-end.This validates both key JavaScript expertise and functional skills for applicants, for example, Lightning Components Platform, and Lightning Web Component technology relevant to JavaScript. Lightning web elements are personalised HTML elements that are designed with traditional HTML and modern JavaScript.
The Salesforce JavaScript Developer I certification requires two parts: the multiple-choice test given by the JavaScript Developer I and the Superbadge Lightning Web Components. In any order, all these credentials can be accessed. A Salesforce Certified Javascript Developer I certification is immediately obtained by adding these two certificates. The qualification applicant for Salesforce JavaScript Accredited Developer I will use the JavaScript language to build front-end or back-end software in one or more frameworks. The applicant will plan, build and evaluate effective , safe and reusable solutions.
The candidate can use JavaScript-specific programming style patterns and can use CSS , HTML, and other languages for integrating JavaScript. With Lightning Web Components, any JavaScript developer can build on Salesforce easily. This means that millions of JavaScript developers around the world will code on Salesforce without learning anything new. Developers can create and deploy brand-new fast apps on Salesforce using the current Lightning Platform development services portfolio and the modern JavaScript language. Salesforce JavaScript Developer I Certificate from Salesforce is designed to help Salesforce partners, customers and employees working on JavaScript as well as the Lightning Component Platform, know-how and knowledge and creation of Lightning web components (LWC's).
NEW QUESTION 95
A developer has the following array of hourly wages:
Let arr = (8, 5, 9, 75, 11, 25, 7, 75, , 13, 25);
For workers making less than $10 an hour rate should be multiple by 1.25 and returned in a new array.
How should the developer implement the request?
- A. let arrl = arr-map((num) => { return ran * 1.25 }).filter((val) -> { return val < 10));
- B. let arrl = arr .rr.acArray ((val) => ( val < 10 )) ,map((num) => { num * 1.25 ));
- C. let arrl = arr.filter((val) => val < 10).map((num) -> num = 1.25);
- D. let arrl = arr.filterBy((val) => val < 10 ).aapBy<(num) -> num = ..25 );
Answer: A
NEW QUESTION 96
Refer to the code below:
Let str = 'javascript';
Str[0] = 'J';
Str[4] = 'S';
After changing the string index values, the value of str is 'javascript'. What is the reason
for this value:
- A. Non-primitive values are immutable.
- B. Primitive values are mutable.
- C. Non-primitive values are mutable.
- D. Primitive values are immutable.
Answer: D
NEW QUESTION 97
developer uses the code below to format a date.
After executing, what is the value of formattedDate?
- A. May 10, 2020
- B. June 10, 2020
- C. November 05, 2020
- D. October 05, 2020
Answer: B
NEW QUESTION 98
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 all from '/path/universalContainerLib.js''
universalContainersLib.foo( ) ;
universalContainersLib bar ( ) : - B. import - as lib from '/path/universalContainerLib.js''
lib.foo( ) ;
lib. bar ( ) ; - C. import + from '/path/universalContainerLib.js''
universalContainersLib.foo( ) ;
universalContainersLib bar ( ) : - D. import (foo,bar) from '/path/universalContainerLib.js''
foo ( ) ;
bar ( ) ;
Answer: B
NEW QUESTION 99
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?
- A. constructor() {
- B. constructor (body, author, viewCount) {
- C. super (body, author, viewCount) {
- D. Function Post (body, author, viewCount) {
Answer: B
NEW QUESTION 100
Refer of the string below:
Const str = 'sa;esforce'=;
Which two statement result in the word 'Sale'?
Choose 2 answers
- A. str, substr(1,5) ;
- B. str, substring (0,5) ;
- C. str, substr(0,5) ;
- D. str, substring(1,5) ;
Answer: B,C
NEW QUESTION 101
Refer to HTML below:
<p> The current status of an Order: <span id ="status"> In Progress </span> </p>.
Which JavaScript statement changes the text 'In Progress' to 'Completed' ?
- A. document.getElementById("#status").innerHTML = 'Completed' ;
- B. document.getElementById("status").Value = 'Completed' ;
- C. document.getElementById("status").innerHTML = 'Completed' ;
- D. document.getElementById(".status").innerHTML = 'Completed' ;
Answer: C
NEW QUESTION 102
Refer to the code below:
Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];
Which two statements result in the array [1, 2, 3, 4, 5] ?
Choose 2 answers
- A. [ ]. Concat.apply ([ ], inArray);
- B. [ ]. concat.apply(inArray, [ ]);
- C. [ ]. concat ( [ ....inArray ] );
- D. [ ]. Concat (... inArray);
Answer: A,D
NEW QUESTION 103
Which statement can a developer apply to increment the browser's navigation history without a page refresh?
Which statement can a developer apply to increment the browser's navigation history without a page refresh?
- A. window.history.state.push(newStateObject);
- B. window.history.pushState(newStateObject);
- C. window.history.replaceState(newStateObject,' ', null);
- D. window.history.pushStare(newStateObject, ' ', null);
Answer: C
NEW QUESTION 104
Refer to the code below:
What is the value result after line 10 executes?
- A. John undefined
- B. John Developer
- C. Undefined Developer
- D. Error: myfather.job is not a function
Answer: D
NEW QUESTION 105
A developer wants to create an object from a function in the browser using the code
below:
Function Monster() { this.name = 'hello' };
Const z = Monster();
What happens due to lack of the new keyword on line 02?
- A. The z variable is assigned the correct object.
- B. Window.m is assigned the correct object.
- C. Window.name is assigned to 'hello' and the variable z remains undefined.
- D. The z variable is assigned the correct object but this.name remains undefined.
Answer: C
NEW QUESTION 106
Cloud Kicks has a class to represent items for sale in an online store, as shown below:
Class Item{
constructor (name, price){
this.name = name;
this.price = price;
}
formattedPrice(){
return 's' + String(this.price);}}
A new business requirement comes in that requests a ClothingItem class that should have all of the properties and methods of the Item class but will also have properties that are specific to clothes.
Which line of code properly declares the clothingItem class such that it inherits from Item?
- A. Class ClothingItem {
- B. Class ClothingItem implements Item{
- C. Class ClothingItem super Item {
- D. Class ClothingItem extends Item {
Answer: D
NEW QUESTION 107
Refer to the following object:
const cat ={
firstName: 'Fancy',
lastName: ' Whiskers',
Get fullName() {
return this.firstName + ' ' + this.lastName;
}
};
How can a developer access the fullName property for cat?
- A. cat.function.fullName()
- B. cat.fullName
- C. cat.get.fullName
- D. cat.fullName()
Answer: B
NEW QUESTION 108
A developer wants to set up a secure web server with Node.js. The developer creates 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 server =require('secure-server');
- C. const tls = require('tls');
- D. const https =require('https');
Answer: D
NEW QUESTION 109
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
- A. 'Update' , (
recordId : '123abc'
( - B. 'Update' , {
Details : {
recordId : '123abc'
}
} - C. 'Update' , '123abc'
- D. { type : 'update', recordId : '123abc' }
Answer: A,B
NEW QUESTION 110
myArraym can have one level, two levels, or more levels.
Which statement flattens myArray when it can be arbitrarily nested?
- A. [ ] .concat {. . .myArray) ;
- B. myArray. join (","). split (",");
- C. myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);
- D. myArray.flat(Infinity);
Answer: C
NEW QUESTION 111
A developer has a web server running with Node.js. The command to start the web server is node server.js. The web server started having latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?
- A. NODE_DEBUG=true node server.js
- B. DEBUG=true node server.js
- C. NODE_DEBUG=http,https node server.js
- D. DEBUG=http, https node server.js
Answer: B
NEW QUESTION 112
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
- A. B
- B. A
- C. D
- D. C
Answer: B
NEW QUESTION 113
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: C
NEW QUESTION 114
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, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.
Which two results occur when running this test on the updated sum3 function?
Choose 2 answers
- A. The line 02 assertion fails.
- B. The line 02 assertion passes.
- C. The line 05 assertion fails.
- D. The line 05 assertion passes.
Answer: B,C
NEW QUESTION 115
Refer to the code below:
What is display when the cod executes?
- A. ReferenceError: b is not defined
- B. Undefined
- C. A
- D. null
Answer: C
NEW QUESTION 116
A developer creates a generic function to log custom messages in the console. To do this, the function below is implemented.
01 function logStatus(status){
02 console./*Answer goes here*/{'Item status is: %s', status};
03 }
Which three console logging methods allow the use of string substitution in line 02?
- A. Assert
- B. Info
- C. Message
- D. Error
- E. Log
Answer: B,D,E
NEW QUESTION 117
Given the expressions var1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is string? Choose 2 answers
- A. String (var1) .concat (var2)
- B. var1 + var2
- C. string.concat (var1 +var2)
- D. var1.toString ( ) var2.toString ( )
Answer: C,D
NEW QUESTION 118
Which option is true about the strict mode in imported modules?
- A. Add the statement use non-strict, before any other statements in the module to enable not-strict mode.
- B. You can only reference notStrict() functions from the imported module.
- C. Add the statement use strict =false; before any other statements in the module to enable not- strict mode.
- D. Imported modules are in strict mode whether you declare them as such or not.
Answer: B
NEW QUESTION 119
GIven a value, which three options can a developer use to detect if the value is NaN?
Choose 3 answers !
- A. value === Number.NaN
- B. Number.isNaN(value)
- C. Object.is(value, NaN)
- D. value == NaN
- E. value ! == value
Answer: B,D
NEW QUESTION 120
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How much Salesforce JavaScript-Developer-I Exam Cost
The price of the Salesforce JavaScript Developer I certification is $200 USD, for more information related to the Salesforce JavaScript-Developer-I Exam please visit Salesforce website.
Benefits in Obtaining Salesforce JavaScript-Developer-I Certification
With the introduction of the Lightning Experience by Salesforce, it is possible to develop cool, looking applications for a wide range of tasks. Admins have been able to create beautiful pages for their objects more than ever, with an interface entirely tailored for each user.For developers, the same application has never before been possible for Salesforce developers to create applications that stretch well beyond Salesforce's declarative features. It's all achieved with the use of a JavaScript application for Lightning & Lightning Web components.
The certification for JavaScript Developer I has just been released and fills a large gap in the certification list for Salesforce. Salesforce Developers who want to prove their Lightning skills, but also new entrants into the Salesforce community, are certified to demonstrate that they know what is relevant. A typical Salesforce 60 multi-choice test is split into two parts and is influenced by a super badge (Similar to Developer II certification).
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