JavaScript-Developer-I PDF Download Apr-2023 Salesforce Test To Gain Brilliante Result!
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NEW QUESTION 51
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,name ( )
- C. dan,firstname ( ) + dan, lastName ( )
- D. dan,name
Answer: A,B
NEW QUESTION 52
Which statement parses successfully?
- A. JSON. parse (""foo"');
- B. JSON.parse (""foo'");
- C. JSON.parse ("foo");
- D. JSON.parse ("foo");
Answer: A
NEW QUESTION 53
Refer to code below:
console.log(0);
setTimeout(() => (
console.log(1);
});
console.log(2);
setTimeout(() => {
console.log(3);
), 0);
console.log(4);
In which sequence will the numbers be logged?
- A. 02431
- B. 0
- C. 01234
- D. 02413
Answer: A
NEW QUESTION 54
Refer to the following code:
What is the value of output on line 11?
- A. [''foo'', ''bar'']
- B. [1, 2]
- C. An error will occur due to the incorrect usage of the for...of statement on line 07.
- D. [''foo'':1, ''bar'':2'']
Answer: C
NEW QUESTION 55
Refer to the following code:
Let sampletext = 'The quick brown fox Jumps';
A developer need to determine if a certain substring is part of a string.
Which three expressions return true for the give substring? Choose 3 answers
- A. sampleText.inclides (fox');
- B. sampleText.indexof ('quick') 1== -1;
- C. sampleText.substing ('fox');
- D. sampleText.includes (fox' , 3);
- E. sampleText.includes (quick', 4);
Answer: D
NEW QUESTION 56
A developer wrote a fizzbuzz function that when passed in a number, returns the following:
* 'Fizz' if the number is divisible by 3.
* 'Buzz' if the number is divisible by 5.
* 'Fizzbuzz' if the number is divisible by both 3 and 5.
* Empty string if the number is divisible by neither 3 or 5.
Which two test cases will properly test scenarios for the fizzbuzz function?
Choose 2 answers
- A. let res = fizzbuzz(5);
console.assert ( res === ' ' ); - B. let res = fizzbuzz(Infinity);
console.assert ( res === ' ' ) - C. let res = fizzbuzz(15);
console.assert ( res === ' fizzbuzz ' ) - D. let res = fizzbuzz(3);
console.assert ( res === ' buzz ' )
Answer: B,C,D
NEW QUESTION 57
A developer is leading the creating of a new browser application that will server a single page application. The team wants to use a new web framework Minialist.js. The lead developer wants to advocate for a more seasoned wen framework that already has a community around it.
Which two frameworks should the load developer advocate for?
- A. Koa
- B. Vue
- C. Express
- D. Angular
Answer: C,D
NEW QUESTION 58
Refer the code below.
x=3.14;
function myfunction() {
"use strict";
y=x;
}
z=x;
myFunction();
Answer:
Explanation:
Z is equal to 3.14
Use strict has effect only on line 5.
Line 5 throws an error
NEW QUESTION 59
Refer to the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));
When does Promise.finally on line 08 get called?
- A. When resolved and settled
- B. When rejected
- C. WHen resolved
- D. When resolved or rejected
Answer: D
NEW QUESTION 60
A developer needs to debug a Node.js web server because a runtime error keeps occurring at one of the endpoints.
The developer wants to test the endpoint on a local machine and make the request against a local server to look at the behavior. In the source code, the server, js file will start the server. the developer wants to debug the Node.js server only using the terminal.
Which command can the developer use to open the CLI debugger in their current terminal window?
- A. node start inspect server,js
- B. node -i server.js
- C. node inspect server,js
- D. node server,js inspect
Answer: C
NEW QUESTION 61
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
- A.
- B.
- C.
- D.
Answer: A
NEW QUESTION 62
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 console.log (input, value);
- B. Replace line 04 with button.addEventListener (''onclick'', function ( ) (
- C. Replace line 04 with const input = document. getElementByName ('input') ;
- D. Replace line 04 with button, addCallback (''click'', function ( ) (
Answer: A
NEW QUESTION 63
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.timeStamp ()
- B. console.getTime ()
- C. console. timeLog ()
- D. console.trace()
Answer: C
NEW QUESTION 64
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.splice(2,3);
- C. Let x= arr.filter (( a) => (a<2));
- D. Let x= arr.slice(2);
- E. Let x = arr.slice(2,3);
Answer: A,B,D
NEW QUESTION 65
Refer to the code below:
What is the output of this function when called with an empty array?
- A. Return 0
- B. Return 5
- C. Return NaN
- D. Return Infinity
Answer: B
NEW QUESTION 66
A class was written to represent items for purchase in an online store, and a second class
Representing items that are on sale at a discounted price. THe constructor sets the name to the
first value passed in. The pseudocode is below:
Class Item {
constructor(name, price) {
... // Constructor Implementation
}
}
Class SaleItem extends Item {
constructor (name, price, discount) {
...//Constructor Implementation
}
}
There is a new requirement for a developer to implement a description method that will return a
brief description for Item and SaleItem.
Let regItem =new Item('Scarf', 55);
Let saleItem = new SaleItem('Shirt' 80, -1);
Item.prototype.description = function () { return 'This is a ' + this.name;
console.log(regItem.description());
console.log(saleItem.description());
SaleItem.prototype.description = function () { return 'This is a discounted ' +
this.name; }
console.log(regItem.description());
console.log(saleItem.description());
What is the output when executing the code above ?
- A. This is a Scarf
This is a Shirt
This is a discounted Scarf
This is a discounted Shirt - B. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt - C. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is aScarf
This is a discounted Shirt - D. This is aScarf
Uncaught TypeError: saleItem.description is not a function
This is a Shirt
This is a did counted Shirt
Answer: B
NEW QUESTION 67
Refer to the following code block:
What is the console output?
- A. > Uncaught Reference Error
- B. > Better student Jackie got 70% on test.
- C. > Jackie got 70% on test.
- D. > Better student Jackie got 100% on test.
Answer: D
NEW QUESTION 68
Universal Container(UC) just launched a new landing page, but users complain that the
website is slow. A developer found some functions that cause this problem. To verify this, the
developer decides to do everything and log the time each of these three suspicious functions
consumes.
console.time('Performance');
maybeAHeavyFunction();
thisCouldTakeTooLong();
orMaybeThisOne();
console.endTime('Performance');
Which function can the developer use to obtain the time spent by every one of the three
functions?
- A. console.timeStamp()
- B. console.trace()
- C. console.getTime()
- D. console.timeLog()
Answer: D
NEW QUESTION 69
......
How to Prepare for Salesforce JavaScript Developer I Exam
Preparation Guide for Salesforce JavaScript Developer I Exam
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