Practice on 2024 LATEST JavaScript-Developer-I Exam Updated 223 Questions
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Salesforce JavaScript-Developer-I exam covers a wide range of topics, including data modeling, Apex programming, JavaScript development, Visualforce development, and Lightning Component development. Candidates must demonstrate their proficiency in each of these areas to pass the exam. JavaScript-Developer-I exam also tests the candidate's ability to design and develop custom applications using Salesforce tools and technologies.
NEW QUESTION # 112
Given a value, which three options can a developer use to detect of the value is NaN?
Choose 3 answers
- A. Value == NaN
- B. Value == Number, NaN
- C. Object , is ( value, NaN)
- D. Value I== value
- E. Number , isNaN(value)
Answer: A,C,E
NEW QUESTION # 113
Which code statement below correctly persists an object in localStorage?
- A. Const setlocalstorage = (storagekey, jsObject) => (
Window. Localstorage.persist (storagekey, jsObject);
) - B. const setLocalstorage = (jsobject) =>
Windows.localstorage.connectobject(jsObject); - C. const setLocalstorage = (storageKey , jsobject) => (
windows. LocalStorage,setitem(storagekey. jSON,string
) - D. Const setLocalstorage = (jsobject ) => (
Window .localstorage .setitem (jsobject) ;
Answer: B
NEW QUESTION # 114
Refer to the code below:
Let foodMenu1 = ['pizza', 'burger', 'French fries'];
Let finalMenu = foodMenu1;
finalMenu.push('Garlic bread');
What is the value of foodMenu1 after the code executes?
- A. [ 'Garlic bread']
- B. [ 'pizza','Burger', 'French fires', 'Garlic bread']
- C. [ 'pizza','Burger', 'French fires']
- D. [ 'Garlic bread' , 'pizza','Burger', 'French fires' ]
Answer: C
NEW QUESTION # 115
Refer to the code below:
Line 05 causes an error.
What are the values of greeting and salutation once code completes?
- A. Greeting is Goodbye and salutation is I say Hello.
- B. Greeting is Hello and salutation is I say hello.
- C. Greeting is Hello and salutation is Hello, Hello.
- D. Greeting is Goodbye and salutation is Hello, Hello.
Answer: C
NEW QUESTION # 116
Given the code below:
01 function GameConsole (name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log( ` $(this.name) is loading a game : $(gamename) ...`);
07 )
08 function Console 16 Bit (name) {
09 GameConsole.call(this, name) ;
10 }
11 Console16bit.prototype = Object.create ( GameConsole.prototype) ;
12 //insert code here
13 console.log( ` $(this.name) is loading a cartridge game : $(gamename) ...`);
14 }
15 const console16bit = new Console16bit(' SNEGeneziz ');
16 console16bit.load(' Super Nonic 3x Force ');
What should a developer insert at line 15 to output the following message using the
method ?
> SNEGeneziz is loading a cartridge game: Super Monic 3x Force . . .
- A. Console16bit = Object.create(GameConsole.prototype).load = function
(gamename) { - B. Console16bit.prototype.load(gamename) = function() {
- C. Console16bit.prototype.load = function(gamename) {
- D. Console16bit.prototype.load(gamename) {
Answer: C
NEW QUESTION # 117
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') . style,width
- C. Documents.getElementById( 'card-01') . width
- D. Documents.getElementById( 'card-01') .getBoundingClientRect () .width
Answer: D
NEW QUESTION # 118
Refer to the code below:
01 const exec = (item, delay) =>{
02 new Promise(resolve => setTimeout( () => resolve(item), delay)),
03 async function runParallel() {
04 Const (result1, result2, result3) = await Promise.all{
05 [exec ('x', '100') , exec('y', 500), exec('z', '100')]
06 );
07 return `parallel is done: $(result1) $(result2)$(result3)`;
08 }
}
}
Which two statements correctly execute the runParallel () function?
Choose 2 answers
- A. runParallel ( ). done(function(data){
return data;
}); - B. runParallel () .then(data);
- C. runParallel () .then(function(data) return data
- D. Async runParallel () .then(data);
Answer: A,C
NEW QUESTION # 119
Refer to the code below:
Line 05 causes an error.
What are the values of greeting and salutation once code completes?
- A. Greeting is Goodbye and salutation is I say Hello.
- B. Greeting is Hello and salutation is I say hello.
- C. Greeting is Hello and salutation is Hello, Hello.
- D. Greeting is Goodbye and salutation is Hello, Hello.
Answer: C
NEW QUESTION # 120
Refer to the code below:
What is the value result after line 10 executes?
- A. John Developer
- B. John undefined
- C. Error: myfather.job is not a function
- D. Undefined Developer
Answer: C
NEW QUESTION # 121
Given the JavaSript below:
Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?
- A. 'hidden'; 'visible'
- B. 'Visible' ; hidden'
- C. 'Block' ; 'none'
- D. none' ; 'block '
Answer: C
NEW QUESTION # 122
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
- A. Let x = arr.filter( (a) => )return a > 2 )) ;
- B. Let x = arr.aplice (2, 3);
- C. Let x = arr.filter( (a) => ( a < 2)) ;
- D. Let x = arr.alice (2) ;
- E. Let x = arr. Slince (2, 3);
Answer: A,B,D
NEW QUESTION # 123
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
- A.
- B.
- C.
- D.
Answer: C
NEW QUESTION # 124
Refer to the following code block:
What is the console output?
- A. > Jackie got 70% on test.
- B. > Uncaught Reference Error
- C. > Better student Jackie got 100% on test.
- D. > Better student Jackie got 70% on test.
Answer: D
NEW QUESTION # 125
A developer is leading the creation of a new browser application that will serve a single page application. The team wants to use a new web framework Minimalsit.js. The Lead developer wants to advocate for a more seasoned web framework that already has a community around it.
Which two frameworks should the lead developer advocate for?
Choose 2 answers
- A. Angular
- B. Express
- C. Koa
- D. Vue
Answer: A,B
NEW QUESTION # 126
Refer to the code snippet below:
Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i < array.length; i++)
if (array[i] === 4) {
array.splice(i, 1);
}
}
What is the value of array after the code executes?
- A. [1, 2, 3, 5]
- B. [1, 2, 3, 4, 5, 4, 4]
- C. [1, 2, 3, 4, 4, 5, 4]
- D. [1, 2, 3, 4, 5, 4]
Answer: C
Explanation:
NEW QUESTION # 127
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 boost
with an event?
- A. Server.catch ((server) => {
console.log('ERROR', error);
}); - B. Server.error ((server) => {
console.log('ERROR', error);
}); - C. Try{
server.start();
} catch(error) { - D. Server.on ('error', (error) => {
console.log('ERROR', error);
});
Answer: D
Explanation:
console.log('ERROR', error);
}
NEW QUESTION # 128
developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number be?
- A. 1.1.4
- B. 1.2.3
- C. 1.2.0
- D. 2.0.0
Answer: C
NEW QUESTION # 129
developer removes the HTML class attribute from the checkout button, so now it is
simply:
<button>Checkout</button>.
There is a test to verify the existence of the checkout button, however it looks for a button with
class= "blue". The test fails because no such button is found.
Which type of test category describes this test?
- A. False positive
- B. True positive
- C. True negative
- D. False negative
Answer: D
NEW QUESTION # 130
A team that works on a big project uses npm to deal with the project's dependencies.
A developer added a dependency to manipulated dates and pushed the updates to the remote repository. The rest of the team complains that the dependency does not get download when they execute npm install.
Which two reason could be possible explanation for this?
- A. The developer added the dependency as a dev dependency, and NODK_ENV is set to production.
- B. The developer added the dependency as a dev dependency, and NOOK_ENV is set to production.
- C. The developer missed the option -ssve when adding the dependency.
- D. The developer missed the option - add when adding the dependency.
Answer: A,B,C
NEW QUESTION # 131
At Universal Containers, every team has its own way of copying JavaScript objects. The code snippet shows an implementation from one team:
What is the output of the code execution?
- A. Hello John Doe
- B. TypeError: Assignment to constant variable
- C. Hello Dan Doe
- D. TypeError: dan.name is not a function
Answer: D
NEW QUESTION # 132
developer publishes a new version of a package with new features that do not break
backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number
be?
- A. 1.1.4
- B. 1.2.3
- C. 1.2.0
- D. 2.0.0
Answer: C
NEW QUESTION # 133
......
Authentic JavaScript-Developer-I Exam Dumps PDF - Apr-2024 Updated: https://pass4sure.examcost.com/JavaScript-Developer-I-practice-exam.html
