Easily To Pass New JavaScript-Developer-I Premium Exam Updated [Jul 26, 2023]
JavaScript-Developer-I Certification All-in-One Exam Guide Jul-2023
In order to take the Salesforce JavaScript-Developer-I Certification Exam, candidates must have a solid understanding of basic JavaScript concepts such as data types, control structures, and functions. They should also be familiar with the Salesforce platform, including Apex, Visualforce, and the Lightning Component Framework. Additionally, candidates should have experience with web development technologies such as HTML, CSS, and JavaScript frameworks like jQuery and AngularJS.
To be eligible for the Salesforce JavaScript-Developer-I exam, candidates must have a basic understanding of JavaScript programming and the Salesforce platform. They must also have experience working with Salesforce tools and technologies, such as Apex, Visualforce, and Lightning Components. The exam consists of multiple-choice questions, and candidates must achieve a passing score to earn the certification.
The Salesforce JavaScript-Developer-I certification exam is a great way to showcase your expertise in building custom applications on the Salesforce platform. This certification is highly valued by employers and can help you stand out in a competitive job market. By passing this exam, you demonstrate your skills in creating custom solutions using Salesforce technologies and your ability to build scalable and secure applications that meet business requirements.
NEW QUESTION # 47
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 - as lib from '/path/universalContainerLib.js''
lib.foo( ) ;
lib. bar ( ) ; - B. import all from '/path/universalContainerLib.js''
universalContainersLib.foo( ) ;
universalContainersLib bar ( ) : - C. import (foo,bar) from '/path/universalContainerLib.js''
foo ( ) ;
bar ( ) ; - D. import + from '/path/universalContainerLib.js''
universalContainersLib.foo( ) ;
universalContainersLib bar ( ) :
Answer: A
NEW QUESTION # 48
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
Function Car (maxSpeed, color){
This.maxspeed =masSpeed;
This.color = color;
Let carSpeed = document.getElementById(' CarSpeed');
Debugger;
Let fourWheels =new Car (carSpeed.value, 'red');
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console ?
Choose 2 answers:
- A. The values of the carSpeed and fourWheels variables
- B. The style, event listeners and other attributes applied to the carSpeed DOM element
- C. A variable displaying the number of instances created for the Car Object.
- D. The information stored in the window.localStorage property
Answer: B,D
NEW QUESTION # 49
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 5 to function world ( ) {
- B. Change line 7 to ) () ;
- C. Change line 9 to sayHello(world) ();
- D. Change line 2 to console.log('Hello' , name() );
Answer: D
NEW QUESTION # 50
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 # 51
Refer to the code:
Given the code above, which three properties are set pet1?
Choose 3 answers:
- A. Name
- B. canTalk
- C. Size
- D. Type
- E. Owner
Answer: B,C,D
NEW QUESTION # 52
Refer to code below:
Let first = 'who';
Let second = 'what';
Try{
Try{
Throw new error('Sad trombone');
}catch (err){
First ='Why';
}finally {
Second ='when';
} catch (err) {
Second ='Where';
}
What are the values for first and second once the code executes ?
- A. First is why and second is where
- B. First is who and second is where
- C. First is Who and second is When
- D. First is why and second is when
Answer: D
NEW QUESTION # 53
Refer to the code:
Given the code above, which three properties are set pet1?
Choose 3 answers:
- A. Name
- B. canTalk
- C. Size
- D. Type
- E. Owner
Answer: B,C,D
NEW QUESTION # 54
A developer copied a JavaScript object:
How does the developer access dan's forstName,lastName? Choose 2 answers
- A. dan, firstName = dan.lastName
- B. dan,firstname ( ) + dan, lastName ( )
- C. dan,name ( )
- D. dan,name
Answer: A,C
NEW QUESTION # 55
A test has a dependency on database.query. During the test the dependency is replaced with an object called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time.
Which two test approaches describe the requirement?
Choose 2 answers
- A. Mocking
- B. Integration
- C. White box
- D. Black box
Answer: A,C
NEW QUESTION # 56
Refer to the expression below:
Let x = ('1' + 2) == (6 * 2);
How should this expression be modified to ensure that evaluates to false?
- A. Let x = ('1' + ' 2') == ( 6 * 2);
- B. Let x = ('1' + 2) == ( 6 * 2);
- C. Let x = (1 + 2 ) == ( 6 / 2);
- D. Let x = (1 + 2) == ( '6' / 2);
Answer: B
NEW QUESTION # 57
Refer to the code below:
Which two function can replace line 01 and return 58 to sum? Choose 2 answers
- A. const addBy = (num1) num1 + num2
- B. Const addby = function (num1) (
Return function (num2) (
}
} - C. const addBy = num1 (num2) => num1 + num2 ;
- D. const addBy = function (num1) {
Return function (num2) {
}
}
Answer: C,D
NEW QUESTION # 58
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 passes.
- B. The line 05 assertion fails.
- C. The line 05 assertion passes.
- D. The line 02 assertion fails.
Answer: A,B
NEW QUESTION # 59
Which code statement correctly retrieves and return an object from localStorage?
A)
B)
C)
D)
- A. Option B
- B. Option C
- C. Option A
- D. Option D
Answer: D
NEW QUESTION # 60
A developer is wondering whether to use, Promise.then or Promise.catch, especially
when a Promise throws an error?
Which two promises are rejected?
Which 2 are correct?
- A. Promise.reject('cool error here').catch(error => console.error(error));
- B. New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error)));
- C. Promise.reject('cool error here').then(error => console.error(error));
- D. New Promise((resolve, reject) => (throw 'cool error here'}).catch(error =>
console.error(error)) ;
Answer: A,D
NEW QUESTION # 61
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..
What is the output when executing the code above
- A. 50
80
50
72 - B. 50
Uncaught TypeError: saleItem,desrcription is not a function
50
80 - C. 50
80
Uncaught Reference Error:this,discount is undefined
72 - D. 50
80
72
Answer: A
NEW QUESTION # 62
A developer has two ways to write a function:
Option A:
function Monster(){
this.growl = ()=>{
console.log('Grr!');
}
}
Option B:
function Monster(){};
Monster.prototype.growl = ()=>{
console.log('Grr!');
}
After deciding on an option, the developer creates 1000 monster objects.
How many growl methods are created with Option A and Option B?
- A. 1000 for Option A, 1 for Option B
- B. 1 methods for both
- C. 1000 for both
- D. 1 for Option A, 1000 for Option B
Answer: B
NEW QUESTION # 63
Refer to the code below:
Const myFunction = arr => {
Return arr.reduce((result, current) =>{
Return result = current;
}, 10};
}
What is the output of this function when called with an empty array ?
- A. Returns NaN
- B. Returns 10
- C. Throws an error
- D. Returns 0
Answer: A
NEW QUESTION # 64
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. Log
- E. Error
Answer: A,B,D
NEW QUESTION # 65
A developer has two ways to write a function:
Option A:
function Monster() {
This.growl = () => {
Console.log ("Grr!");
}
}
Option B:
function Monster() {};
Monster.prototype.growl =() => {
console.log("Grr!");
}
After deciding on an option, the developer creates 1000 monster objects.
How many growl methods are created with Option A Option B?
- A. 1 growl method is created for Option A. 1000 growl methods are created for Option B.
- B. 1000 growl methods are created regardless of which option is used.
- C. 1 growl method is created regardless of which option is used.
- D. 1000 growl method is created for Option A. 1 growl methods are created for Option B.
Answer: D
NEW QUESTION # 66
A developer is trying to handle an error within a function.
Which code segment shows the correct approach to handle an error without propagating it elsewhere?
A)
B)
C)
D)
- A. Option B
- B. Option C
- C. Option A
- D. Option D
Answer: D
NEW QUESTION # 67
A developer is creating a simple webpage with a button. When a user clicks this button
for the first time, a message is displayed.
The developer wrote the JavaScript code below, but something is missing. The
message gets displayed every time a user clicks the button, instead of just the first time.
01 function listen(event) {
02 alert ( 'Hey! I am John Doe') ;
03 button.addEventListener ('click', listen);
Which two code lines make this code work as required?
Choose 2 answers
- A. On line 06, add an option called once to button.addEventListener().
- B. On line 04, use button.removeEventListener(' click" , listen);
- C. On line 04, use event.stopPropagation ( ),
- D. On line 02, use event.first to test if it is the first execution.
Answer: A,B
NEW QUESTION # 68
Refer to the code below:
Which assertion accurately tests the above code?
- A. Console, assert ( await functionalUnderTest (true) , 'ok
- B. Console, assert (functionalUnderTest (true) , 'ok')
- C. Console, assert ( await functionalUnderTest (true) , 'not ok) )
- D. Console, assert ( await functionalUnderTest (true) , 'not ok' )
Answer: B
NEW QUESTION # 69
......
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