Updated Nov 04, 2021 Verified Pass JavaScript-Developer-I Exam in First Attempt Guaranteed
Free JavaScript-Developer-I Sample Questions and 100% Cover Real Exam Questions (Updated 160 Questions)
Average Salary for Salesforce JavaScript-Developer-I Exam Certified Professional
Salesforce JavaScript Developer roles are in great demand nowadays. The average salaries of Salesforce JavaScript Developer I exam Certified professional in:
- Europe - 63,500 Euro
- England - 60,200 POUND
- United State - 129,630 USD
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
- Software/backend developer
- Salesforce developer
- Support engineer
- Web application developer
- Technical Project Manager
- Technical Product Manager
- Full stack developer
- JavaScript programmer
- UI/UX Engineer
Difficulty in Writing of Salesforce JavaScript-Developer-I Exam
As Javascript development observed in nearly all organizations, Salesforce JavaScript-Developer-I is the most successful qualification candidates can get on their resume. Professionals have therefore been known to demonstrate concern. But this JavaScript-Developer-I can be very easy to clear if practitioners study with JavaScript-Developer-I exam dumps and then take the JavaScript-Developer-I practice exams. However, with accurate focusing and proper planning content, candidates will clear the test. With the aid of these materials, aspirants get reasonable idea about the kind of questions they pose in actual certification, the certification questions provides the most-represented JavaScript-Developer-I practice tests. The Salesforce experts check Free4Dump JavaScript-Developer-I dumps. Certification questions also include a test for practise and is an ideal forum for checking the information achieved.
NEW QUESTION 66
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 I== value
- C. Value == Number, NaN
- D. Number , isNaN(value)
- E. Object , is ( value, NaN)
Answer: A,D,E
NEW QUESTION 67
The developer has a function that prints "Hello" to an input name. To test this, thedeveloper created a function that returns "World". However the following snippet does not print " Hello World".
What can the developer do to change the code to print "Hello World" ?
- A. Change line 7 to ) () ;
- B. Change line 9 to sayHello(world) ();
- C. Change line 2 to console.log('Hello' , name() );
- D. Change line 5 to function world ( ) {
Answer: C
NEW QUESTION 68
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 69
Given the following code:
What is the output of line 02?
- A. ''x''
- B. ''null''
- C. ''Undefined''
- D. ''object''
Answer: D
NEW QUESTION 70
A developer has the following array of student test grades:
Let arr - [7, 8, 5, 9]
How should want to double each score and then see an array of the students who scored more than 15 points.
How should the developer implement the request?
- A. Let arr1 = arr .filter ((filter ((val) => ( return val > 15 )) .map (( num => ( return num +2 ));
- B. Let arr1 = arr.mapBy ((num) => return num + 2 )) .filterBy ((val) => ( return val > 15 )) ;
- C. Let arr1 = arr .map ((num => ( num + 2 )) .filterBy ((val => ( val 15 )) ;
- D. Let arr1 = arr.map ((num) => num + 2 .filter ((val) => val 15 );
Answer: D
NEW QUESTION 71
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 button, addCallback (''click'', function ( ) (
- B. Replace line 04 with const input = document. getElementByName ('input') ;
- C. Replace line 04 with button.addEventListener (''onclick'', function ( ) (
- D. Replace line 04 with console.log (input, value);
Answer: D
NEW QUESTION 72
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. Date = new Date (+9) ;
- C. deliveryDate. setDate ( Date . current () + 9 0;
- D. deliveryDate . date = date . current () + 9
Answer: A
NEW QUESTION 73
Refer to the code below:
What is the value of result when the code executes?
- A. 10 - 10
- B. 5 - 10
- C. 10 - 5
- D. 5 - 5
Answer: A
NEW QUESTION 74
Given the code below:
Const copy = JSON.stringify((new String ('false') , new Bolean(false) undefined)); What is the value of copy?
- A. -- [ \'false\'', false, undefined]'' ''
- B. --[ false, ()]-
- C. -- [\''false\", ()""
- D. -- [\''false\'', false, null]" "
Answer: D
NEW QUESTION 75
Why would a developer specify a package as the package.json as a deDepdelivery instead of a depdelivery?
- A. It should be bundled when the package is published.
- B. It is only needed for local development and testing.
- C. Other required packages depended on it for development.
- D. It is required by the application in production.
Answer: B
NEW QUESTION 76
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 77
Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions any that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
Which function can the developer use to obtain the time spent by every one of the three functions?
- A. console.trace()
- B. console. timeLog ()
- C. console.timeStamp ()
- D. console.getTime ()
Answer: B
NEW QUESTION 78
Refer to the code below:
Why does the function bar have access to variable =?
- A. Outer function's scope
- B. Hoisting
- C. Inner function's scope
- D. Prototype chain
Answer: C
NEW QUESTION 79
Which three actions can be done using the JavaSript browser console?
Choose 3 answer
- A. Run code a that is not related to the page.
- B. Display a report showing the performance of a page.
- C. View, change, and debug the JavaScript code of the page.
- D. View and change security cookies
- E. View and change the DOM of the page.
Answer: A,C,E
NEW QUESTION 80
A developer creates a generic function to log custom messages In the console. To do this, the function below is implemented.
Which three console logging methods allow the use of string substitution in line 02?
Choose 3 answers
- A. Log
- B. Assert
- C. Info
- D. error
- E. Message
Answer: B,D,E
NEW QUESTION 81
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 82
The developer has a function that prints ''Hello'' to an input name. To test this, the developer created a function that returns world''.
What can the developer do to change the code to print ''Hello world''?
- A. Change line 7 to ) () ;
- B. Change line 5 to function world () (
- C. Change line 2 to console.log ( 'Hello', name () );
- D. Change line 9 to sayhello (world () ;
Answer: A
NEW QUESTION 83
Which JavaScript method can be used to serialize an object into a string and deserialize a JSON string into an object, respectively?
- A. JSON.encode and JSON decode
- B. JSON,serialize and JSON,desrialize
- C. JSON.Stringify and JSON.parse
- D. JSON.parse and JSON deserialize
Answer: B
NEW QUESTION 84
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. Async runParallel () .then(data);
- B. runParallel ( ). done(function(data){
return data;
}); - C. runParallel () .then(function(data) return data
- D. runParallel () .then(data);
Answer: B,C
NEW QUESTION 85
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 86
Refer to the code below:
let productSKU = '8675309,;
A developer has a requirement to generate SKU numbers that are always 10 characters log, starting with 'sku', and padded with zeros.
Which statement assigned the value skuooooooooo86675309?
- A. productSKU = productSKU. PadEnd (16, '0' padstart ('sku') ;
- B. productSKU = productSKU. Padstart (16, '0' padstart (19, 'sku') ;
- C. productSKU = productSKU. PadEnd (16, '0' padstart (19, 'sku') ;
- D. productSKU = productSKU. Padstart (19, '0' padstart ('sku') ;
Answer: B
NEW QUESTION 87
A developer wants to define a function log to be used a few times on a single-file JavaScript script.
01 // Line 1 replacement
02 console.log('"LOG:', logInput);
03 }
Which two options can correctly replace line 01 and declare the function for use?
Choose 2 answers
- A. function log = (logInput) {
- B. const log(loginInput) {
- C. function leg(logInput) {
- D. const log = (logInput) => {
Answer: C,D
NEW QUESTION 88
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