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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 2	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 3	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 4	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 5	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 6	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q75-Q80):

NEW QUESTION # 75
Which two console logs output NaN?

A. console.log(10 / 'five');
B. console.log(10 / Number('5'));
C. console.log(10 / 0);
D. console.log(parseInt('two'));

Answer: A,D

Explanation:
Recall:
NaN stands for "Not-a-Number".
Arithmetic involving non-numeric values that cannot be converted to numbers often results in NaN.
Check each:
A . 10 / 0
In JavaScript, dividing a positive number by 0 results in Infinity, not NaN.
So this logs Infinity.
B . parseInt('two')
parseInt tries to parse a numeric prefix from the string.
'two' does not start with numeric digits, so parseInt('two') returns NaN.
The console log prints NaN.
C . 10 / Number('5')
Number('5') → 5.
10 / 5 → 2.
Logs 2, not NaN.
D . 10 / 'five'
'five' is coerced to a number using Number('five'), which is NaN.
10 / NaN → NaN.
Logs NaN.
So the console logs that output NaN are from B and D.
Relevant concepts: NaN, Infinity, parseInt, Number() coercion, arithmetic with invalid numeric values.

NEW QUESTION # 76
JavaScript:
01 function Tiger() {
02 this.type = 'Cat';
03 this.size = 'large';
04 }
05
06 let tony = new Tiger();
07 tony.roar = () => {
08 console.log('They\'re great!');
09 };
10
11 function Lion() {
12 this.type = 'Cat';
13 this.size = 'large';
14 }
15
16 let leo = new Lion();
17 // Insert code here
18 leo.roar();
Which two statements could be inserted at line 17 to enable line 18?

A. Object.assign(leo, Tiger);
B. leo.prototype.roar = () => { console.log('They\'re pretty good!'); };
C. leo.roar = () => { console.log('They\'re pretty good!'); };
D. Object.assign(leo, tony);

Answer: C,D

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge There are two valid ways to ensure leo.roar() exists:
Directly assign a roar function to leo (Option A).
Assigning a property to an instance object creates a new method on that instance.
leo.roar = () => { console.log('They\'re pretty good!'); };
After this, calling leo.roar() is valid.
Copy tony's properties into leo using Object.assign (Option B).
Object.assign(target, source) copies enumerable own properties from the source object into the target object.
Since tony.roar exists, executing:
Object.assign(leo, tony);
copies roar into leo, making leo.roar() valid.
Why the other answers are incorrect:
Option C:
Object.assign(leo, Tiger) copies properties from the function object Tiger, not from Tiger.prototype and not from a Tiger instance. Tiger (the function) has no roar property, so nothing useful is copied.
Option D:
leo.prototype is undefined because leo is an instance, not a constructor function. Only constructor functions have a .prototype property. This line would cause an error.
________________________________________
JavaScript Knowledge Reference (text-only)
Instances have their own properties and do not contain a .prototype property.
Object.assign(target, source) copies own enumerable properties of the source object.
Assigning a function as a property of an object creates a callable method.

NEW QUESTION # 77
Which three browser specific APIs are available for developers to persist data between page loads?

A. localStorage
B. IIFEs
C. cookies
D. indexedDB
E. global variables

Answer: A,C,D

Explanation:
We want mechanisms that persist data between page loads (i.e., after refresh or navigation), in the browser.
A . localStorage
Part of the Web Storage API.
Data persists across page reloads and browser restarts (until explicitly cleared).
Scoped per origin (protocol + host + port).
This is a correct persistent storage API.
B . indexedDB
A low-level, client-side NoSQL database in the browser.
Stores large amounts of structured data and persists across reloads and sessions.
This is also a correct persistent API.
C . cookies
Small key/value pairs stored by the browser and often sent with HTTP requests.
Can have expiration dates and persist across page loads and sessions.
They are a traditional persistence mechanism in browsers.
So cookies also qualify.
D . global variables
Global JS variables exist only for the life of the current page context.
When the page is refreshed or navigated away, they are lost.
They do not persist between page loads.
E . IIFEs (Immediately Invoked Function Expressions)
A pattern for creating a new scope, not a persistence mechanism.
Variables inside an IIFE are still lost when the page reloads.
Thus, the three persistent browser APIs are:
localStorage
indexedDB
cookies

NEW QUESTION # 78
Which statement parses successfully?

A. JSON.parse (""foo'");
B. JSON.parse ("foo");
C. JSON. parse (""foo"');
D. JSON.parse ("foo");

Answer: C

NEW QUESTION # 79
Refer the following code

what is the value of array after code executes?

Answer:

Explanation:
See the Answer below in explanation

NEW QUESTION # 80
......

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