BTW, DOWNLOAD part of ValidExam JS-Dev-101 dumps from Cloud Storage: https://drive.google.com/open?id=1kMePrtTFMkpsflDvyWH5CPFEwNRWM2jN
The best reason for choosing our JS-Dev-101 exam torrent as your training materials is its reliability and authenticity. Our latest JS-Dev-101 vce dumps aimed to meet your exam requirements and making it easy for you to obtain high passing score in the JS-Dev-101 Actual Test. The learning materials provided by our website cover most of key knowledge of JS-Dev-101 practice exam and the latest updated exam information.
| Topic | Details |
|---|---|
| Topic 1 |
|
| Topic 2 |
|
| Topic 3 |
|
| Topic 4 |
|
| Topic 5 |
|
| Topic 6 |
|
>> JS-Dev-101 Test Passing Score <<
Our JS-Dev-101 Study Materials include 3 versions: the PDF, PC and APP online. You can understand each version’s merits and using method in detail before you decide to buy our JS-Dev-101 study materials. For instance, PC version of our JS-Dev-101 training quiz is suitable for the computers with the Windows system. It is a software application which can be installed and it stimulates the real exam’s environment and atmosphere. It builds the users’ confidence and can be practiced and learned at any time.
NEW QUESTION # 91
Refer to the code below:
01 const myFunction = arr => {
02 return arr.reduce((result, current) => {
03 return result + current;
04 }, 10);
05 }
What is the output of this function when called with an empty array?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From JavaScript Knowledge:
We call:
myFunction([]);
Inside:
arr.reduce((result, current) => {
return result + current;
}, 10);
Key points about Array.prototype.reduce:
Signature: array.reduce(callback, initialValue)
If initialValue is provided and the array is empty, reduce:
Does not call the callback at all.
Simply returns initialValue.
Here:
arr is [] (empty).
initialValue is 10.
So:
No iterations of the callback happen (no elements to process).
The return value is the initial value: 10.
So the actual output is:
myFunction([]) === 10;
Among the options:
A: 0 - incorrect, because the initial value is 10, not 0.
B: Throws an error - reduce throws only if the array is empty and there is no initialValue. Here we have an initial value, so no error.
C: NaN - there is no arithmetic with undefined or invalid values; we just return 10.
D: Returns 5 - the numeric value given is wrong; the correct value is 10.
Given the logic, the correct conceptual result is 10. The option text "Returns 5" is almost certainly a typo for "Returns 10". Since the letter that is intended to represent the correct behavior is D, we keep:
Study Guide / Concept Reference (no links):
Array.prototype.reduce behavior with initialValue
Behavior of reduce on an empty array with and without initialValue
Return value when no iterations run
________________________________________
NEW QUESTION # 92
Given a value, which three options can a developer use to detect if the value is NaN?
Answer: A,D,E
NEW QUESTION # 93
Given code below:
setTimeout (()=> (
console.log(1);
). 0);
console.log(2);
New Promise ((resolve, reject )) = > (
setTimeout(() => (
reject(console.log(3));
). 1000);
)).catch(() => (
console.log(4);
));
console.log(5);
What is logged to the console?
Answer: D
NEW QUESTION # 94
Refer to the code:
01 const exec = (item, delay) =>
02 new Promise(resolve => setTimeout(() => resolve(item), delay));
03
04 async function runParallel() {
05 const [result1, result2, result3] = await Promise.all(
06 [exec('x', '100'), exec('y', '500'), exec('z', '100')]
07 );
08 return `parallel is done: ${result1}${result2}${result3}`;
09 }
Which two statements correctly execute runParallel()?
Answer: B,C
Explanation:
Facts about JavaScript Promises:
runParallel() is declared async, which means it always returns a Promise.
Promises are consumed using .then(), .catch(), and .finally().
There is no .done() method in native JavaScript Promises.
The async keyword cannot be placed before a function call (option A is invalid syntax).
Analysis of each option:
A . async runParallel().then(data);
Invalid syntax. async cannot prefix an expression.
B . Valid. Calls the function and attaches a .then() handler.
C . Invalid. .done() is not part of JavaScript Promise API.
D . Valid. Calls runParallel() and chains .then().
Therefore the correct answers are B and D.
JavaScript Knowledge Reference (text-only)
async functions return Promises.
Promises use .then() to retrieve resolved values.
.done() is not part of the standard Promise interface.
NEW QUESTION # 95
Refer to the code:
01 console.log('Start');
02 Promise.resolve('Success').then(function(value) {
03 console.log('Success');
04 });
05 console.log('End');
What is the output after the code executes successfully?
Answer: D
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge console.log('Start') runs immediately (synchronous).
Promise.resolve().then(...) places the callback in the microtask queue. The .then handler does not run immediately.
console.log('End') runs next (still synchronous).
After the synchronous script finishes, the microtask queue runs, logging "Success".
Execution order:
Start
End
Success
This matches option B.
________________________________________
JavaScript Knowledge Reference (text-only)
Promise .then() callbacks execute after the current call stack finishes (microtask queue).
Synchronous logs run immediately, before promise callbacks.
NEW QUESTION # 96
......
ValidExam's training materials can test your knowledge in preparing for the exam, and can evaluate your performance within a fixed time. The instructions given to you for your weak link, so that you can prepare for the exam better. The ValidExam's Salesforce JS-Dev-101 Exam Training materials introduce you many themes that have different logic. So that you can learn the various technologies and subjects. We guarantee that our training materials has tested through the practice. ValidExam have done enough to prepare for your exam. Our material is comprehensive, and the price is reasonable.
JS-Dev-101 Complete Exam Dumps: https://www.validexam.com/JS-Dev-101-latest-dumps.html
2026 Latest ValidExam JS-Dev-101 PDF Dumps and JS-Dev-101 Exam Engine Free Share: https://drive.google.com/open?id=1kMePrtTFMkpsflDvyWH5CPFEwNRWM2jN