JS-Dev-101 Valid Exam Cram - JS-Dev-101 Exams Dumps

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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
  • Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 3
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 4
  • 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 5
  • Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
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 Exams Dumps - JS-Dev-101 Questions

The prominent benefits of Salesforce Certified JavaScript Developer - Multiple Choice certification exam are validation of skills, updated knowledge, more career opportunities, instant rise in salary, and advancement of the career. Obviously, every serious professional wants to gain all these advantages. With the Salesforce JS-Dev-101 Certification Exam, you can achieve this goal nicely and quickly.

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q132-Q137):

NEW QUESTION # 132
Given a value, which two options can a developer use to detect if the value is NaN?

Answer: B,C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
We already know NaN is special: it is not equal to itself.
Check each:
A . value === Number.NaN
Number.NaN is NaN.
NaN === NaN is always false.
This will never be true; cannot reliably detect NaN.
B . value == NaN
NaN == NaN is also always false.
Again, this never detects NaN.
C . isNaN(value)
Global isNaN converts its argument to a number and then checks if the result is NaN.
This can detect NaN, but it may also return true for non-number values that coerce to NaN, such as isNaN('foo').
Regardless, it is a standard way to detect if a value is "NaN-like" in JavaScript.
D . Object.is(value, NaN)
Object.is(NaN, NaN) returns true.
This is a strict way to detect a value that is exactly NaN (no coercion).
Therefore, among the given choices, the two viable ways to detect NaN are:
isNaN(value)
Object.is(value, NaN)
________________________________________


NEW QUESTION # 133
Given the code below:
const copy = JSON.stringify([ newString(' false '), new Bollean( false ), undefined ]); What is the value of copy?

Answer: D


NEW QUESTION # 134
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: B,D


NEW QUESTION # 135
Refer to the code below:
01 function changeValue(param) {
02 param = 5;
03 }
04 let a = 10;
05 let b = a;
06
07 changeValue(b);
08 const result = a + ' - ' + b;
What is the value of result when the code executes?

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
We must understand pass-by-value for primitives in JavaScript.
Initial values:
let a = 10;
let b = a; // b gets a copy of the value 10
So:
a is 10
b is 10 (independent copy)
Function call:
changeValue(b);
Function definition:
function changeValue(param) {
param = 5;
}
param receives the value of b, which is 10.
Inside the function, param is a local variable.
param = 5; changes only this local copy.
It does not affect b outside the function.
After the function call:
a is still 10.
b is still 10.
Result:
const result = a + ' - ' + b;
a is 10.
b is 10.
String concatenation: '10 - 10'.
So result is:
"10 - 10"
Therefore, the correct option is:
Study Guide Concepts:
Primitive values (numbers, strings, booleans) are passed by value
Function parameters as local variables
String concatenation with +
Difference between mutating references vs primitives
________________________________________


NEW QUESTION # 136
Refer to the followingcode:

Answer: D


NEW QUESTION # 137
......

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