Vce JS-Dev-101 File - JS-Dev-101 Study Material

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Salesforce JS-Dev-101 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 2
  • Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
Topic 3
  • Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 4
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 5
  • Variables, Types, and Collections: Covers declaring and initializing variables, working with strings, numbers, dates, arrays, and JSON, along with understanding type coercion and truthy
  • falsy evaluations.
Topic 6
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.

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JS-Dev-101 Study Material - Valid Test JS-Dev-101 Fee

We provide updated and real Salesforce JS-Dev-101 exam questions that are sufficient to clear the Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) exam in one go. The product of PassExamDumps is created by seasoned professionals and is frequently updated to reflect changes in the content of the JS-Dev-101 Exam Questions.

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q46-Q51):

NEW QUESTION # 46
In which situation should a developer include a try .. catch block around their function call ?

Answer: A


NEW QUESTION # 47
Given the JavaScript below:
01 function filterDOM(searchString){
02 const parsedSearchString = searchString && searchString.toLowerCase();
03 document.querySelectorAll('.account').forEach(account => {
04 const accountName = account.innerHTML.toLowerCase();
05 account.style.display = accountName.includes(parsedSearchString) ? /* Insert code here */;
06 });
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?

Answer: A

Explanation:
We have a ternary:
account.style.display = accountName.includes(parsedSearchString)
? /* if true */
: /* if false */;
Requirement:
If the account matches the search string → show it.
If it does not match → hide it.
For display:
Show: 'block' (or similar visible value).
Hide: 'none'.
So we want:
account.style.display = accountName.includes(parsedSearchString)
? 'block'
: 'none';
That corresponds to option A.
Why others are wrong:
B, C use values suitable for visibility, not display.
D ('none' : 'block') inverts the logic, hiding matches and showing non-matches.
________________________________________


NEW QUESTION # 48
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

Answer: C,D


NEW QUESTION # 49
Given the following code:
let x = ('15' + 10) * 2;
What is the value of x?

Answer: C

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge String + Number results in String concatenation When JavaScript evaluates:
'15' + 10
the + operator sees a string on the left ('15') and a number on the right (10).
In JavaScript, when one operand is a string, the + operator performs string concatenation.
Thus:
'15' + 10 → '1510'
After concatenation, multiplication forces numeric conversion
The expression becomes:
'1510' * 2
The * operator always expects numeric operands.
When given a string, JavaScript attempts numeric conversion using the internal ToNumber operation.
'1510' becomes:
1510
Then:
1510 * 2 = 3020
But 3020 is not in the answer choices-however note the answers represent:
A . 1520
B . 50
C . 35
D . 3020
The correct numeric calculation yields 3020, which matches option D.
But wait-did we misread?
Let's double-check:
('15' + 10) * 2
= '1510' * 2
= 3020
Correct value is 3020.
Therefore the right answer is D.
________________________________________
JavaScript Knowledge Reference (text-only)
The + operator concatenates if either operand is a string.
The * operator always performs numeric coercion.
'numberString' * number converts the string to a number before multiplication.


NEW QUESTION # 50
01 class Student {
02 constructor(name) {
03 this._name = name;
04 }
05 displayGrade() {
06 console.log(`${this._name} got 70% on test.`);
07 }
08 }
09
10 class GraduateStudent extends Student {
11 constructor(name) {
12 super(name);
13 this._name = "Graduate Student " + name;
14 }
15 displayGrade() {
16 console.log(`${this._name} got 100% on test.`);
17 }
18 }
19 let student = new GraduateStudent("Jane");
20 student.displayGrade();
```
What is the console output?:

Answer: C


NEW QUESTION # 51
......

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