2024 Valid JavaScript-Developer-I Real Exam Questions (Updated) 100% Dumps & Practice Exam
[UPDATED 2024] Salesforce JavaScript-Developer-I Questions Prepare with Free Demo of PDF
Salesforce JavaScript-Developer-I certification exam is designed to test the knowledge and expertise of JavaScript developers who work with Salesforce. Salesforce Certified JavaScript Developer I Exam certification is highly valuable for professionals looking to advance their career in the Salesforce ecosystem. JavaScript-Developer-I exam covers a wide range of topics related to JavaScript and Salesforce including Apex, Visualforce, Lightning Components, and more.
NEW QUESTION # 55
A developer has the function, shown below, that is called when a page loads.
Where can the developer see the log statement after loading the page in the browser?
- A. On the browser JavaScript console
- B. In the browser performance tools log
- C. On the webpage console log
- D. On the terminal console running the web server
Answer: A
NEW QUESTION # 56
Refer to the following code:
class Vehicle{
constructor(plate){
this.plate = plate;
}
}
class Truck extends Vehicle{
constructor(plate, weight){
//Missing code
this.weight = weight;
}
displayWeight(){
console.log(`The truck ${this.plate} has a weight of ${this.weight}lb.`);
}
}let myTruck = new Truck('123Ab',5000);
myTruck.displayWeight();
Which statement should be added to missing code for the code to display 'The truck 123AB has a weight of 5000lb.
- A. super.plate = plate
- B. this.plate = plate
- C. super(plate)
- D. Vehicle.plate = plate
Answer: C
NEW QUESTION # 57
In the browser, the window object is often used to assign variables that require the broadest scope in an application Node.js application does not have access to the window object by default.
Which two methods are used to address this ?
Choose 2 answers
- A. Use the document object instead of the window object.
- B. Assign variables to module.exports and require them as needed.
- C. Create a new window object in the root file.
- D. Assign variables to the global object.
Answer: D
NEW QUESTION # 58
Considering type coercion, What does the following expression evaluate to?
True + '13 ' + NaN
- A. 113NaN
- B. 0
- C. 'true13NaN'
- D. 'true13'
Answer: A
NEW QUESTION # 59
Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as [1, 2]?
Choose 3 answer
- A. let x arr.filter((a) => (return a <= 2 });
- B. let x = arr. slice (2);
- C. let x = arr. slice (0, 2);
- D. let x =arr.splice(0, 2);
- E. let x = arr.filter ((a) => 2 }) ;
Answer: A,C,D
NEW QUESTION # 60
A developer wants to use a module called DataPrettyPrint. This module exports one default functioncalled printDate ().
How can a developer import and use the printDate() function?
- A.
- B.
- C.
- D.
Answer: A
NEW QUESTION # 61
Which three browser specific APIs are available for developer to persist data between page loads?
Choose 3 answers
- A. IIFEs
- B. localStorage
- C. cookies
- D. indexedDB
- E. global variables
Answer: A,B,D
NEW QUESTION # 62
Refer to the following code:
What is the output of line 11?
- A. ["foo:1", "bar:2"]
- B. ["bar", "foo"]
- C. [1,2]
- D. ["foo", "bar"]
Answer: D
NEW QUESTION # 63
Given the following code:
let x = null;
console.log(typeof x);
What is the output?
- A. "x"
- B. "null"
- C. "undefined"
- D. "object"
Answer: D
NEW QUESTION # 64
Which code statement below correctly persists an objects inlocal Storage ?
- A. const setLocalStorage = (storageKey, jsObject) => {window.localStorage.setItem(storageKey, JSON.stringify(jsObject));}
- B. const setLocalStorage = (storageKey, jsObject) => {window.localStorage.persist(storageKey, jsObject);}
- C. const setLocalStorage = ( jsObject) =>{window.localStorage.connectObject(jsObject));}
- D. const setLocalStorage= ( jsObject) => {window.localStorage.setItem(jsObject);}
Answer: A
NEW QUESTION # 65
What are two unique feature of function defined with a fat arror as compared to normal functional definition?
Choose 2 answers
- A. If the function has a single expression in the function body, the expression will be evaluated and implicitly returned.
- B. The function uses the this from the enclosing scope.
- C. The function receives an argument that is always in scope, called parent this, which is the enclosing lexical scope
- D. The function generation its own this making it useful for separating the function's scope its enclosing scope
Answer: A
NEW QUESTION # 66
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 Dan Doe
- B. Hello Dan
- C. SyntaxError: Unexpected token in JSON
- D. Hello John Doe
Answer: C
NEW QUESTION # 67
Given the following code:
What will be the first four numbers logged?
- A. 0123
- B. 0012
- C. 0122
- D. 0112
Answer: C
NEW QUESTION # 68
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 04, use event.stopPropagation ( ),
- B. On line 02, use event.first to test if it is the first execution.
- C. On line 06, add an option called once to button.addEventListener().
- D. On line 04, use button.removeEventListener(' click" , listen);
Answer: C,D
NEW QUESTION # 69
Which javascript methods can be used to serialize an object into a string and deserialize
a JSON string into an object, respectively?
- A. JSON.stringify and JSON.parse
- B. JSON.encode and JSON.decode
- C. JSON.serialize and JSON.deserialize
- D. JSON.parse and JSON.deserialize
Answer: A
NEW QUESTION # 70
A developer has the function, shown below, that is called when a page loads.
Where can the developer see the log statement after loading the page in the browser?
- A. On the browser JavaScriptconsole
- B. In the browser performance tools log
- C. On the webpage console log
- D. On the terminal console running the web server
Answer: A
NEW QUESTION # 71
Which statement phrases successfully?
- A. JSON.parse ( " foo " );
- B. JSON.parse ( ' foo ' );
- C. JSON.parse( " ' foo ' " );
- D. JSON.parse(' " foo " ');
Answer: D
NEW QUESTION # 72
Refer to the code below:
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a specific element, myElement on the page had been clicked?
Answer:
Explanation:
event.target.id =='myElement'
NEW QUESTION # 73
Refer to the code below:
for(let number =2 ; number <= 5 ; number += 1 ) {
// insert code statement here
}
The developer needs to insert a code statement in the location shown. The code
statement has these requirements:
1. Does require an import
2. Logs an error when the boolean statement evaluates to false
3. Works in both the browser and Node.js
Which meet the requirements?
- A. console.error(number % 2 === 0);
- B. console.assert(number % 2 === 0);
- C. assert (number % 2 === 0);
- D. console.debug(number % 2 === 0);
Answer: A
NEW QUESTION # 74
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?
- A. > true > false
- B. > 5 >undefined
- C. > 5 > 0
- D. > 5 > -1
Answer: B
Explanation:
NEW QUESTION # 75
Which statement can a developer apply to increment the browser's navigation history without a page refesh?
- A. Window.history,pushState.(newStateObject);
- B. Window.history,state,push.(newStateObject, ' ' null;
- C. Window.history,state,push.(newStateObject);
- D. Window.history,pushState.(newStateObject, ' ', null)) ;
Answer: B
NEW QUESTION # 76
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. Info
- C. error
- D. Assert
- E. Message
Answer: C,D,E
NEW QUESTION # 77
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Salesforce Certified JavaScript Developer I certification is highly valued in the industry, and it provides numerous benefits to professionals. Salesforce Certified JavaScript Developer I Exam certification can help developers to enhance their career opportunities, increase their earning potential, and get recognized as experts in the industry. Salesforce Certified JavaScript Developer I Exam certification also provides access to a wide range of resources, including training, support, and networking opportunities.
Salesforce JavaScript-Developer-I certification exam is designed to test the knowledge of developers who use JavaScript on the Salesforce platform. JavaScript-Developer-I exam is intended for those who build custom applications and functionality using the Salesforce Lightning Component Framework and Apex. JavaScript-Developer-I exam is also suitable for those who have experience with web development and JavaScript and are looking to expand their credentials with Salesforce.
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