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Salesforce JS-Dev-101 Exam Syllabus Topics:

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

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Quiz Salesforce - Authoritative JS-Dev-101 - Salesforce Certified JavaScript Developer - Multiple Choice Certification Materials

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q87-Q92):

NEW QUESTION # 87
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.getTime()
B. console.timeStamp()
C. console.timeLog()
D. console.trace()

Answer: C

NEW QUESTION # 88
01 function Monster() { this.name = 'hello'; };
02 const m = Monster();
What happens due to the missing new keyword?

A. window.m is assigned the correct object.
B. The m variable is assigned the correct object.
C. window.name is assigned to 'hello' and the variable m remains undefined.
D. The m variable is assigned the correct object but this.name remains undefined.

Answer: C

Explanation:
In JavaScript, when calling a constructor function without new:
const m = Monster();
the following happens:
The function executes as a normal function, not as a constructor.
Inside a regular function (in non-strict mode), this refers to the global object:
In a browser: window
So the line:
this.name = 'hello';
becomes:
window.name = 'hello';
Since Monster() does not return anything, its return value is undefined:
const m = undefined;
Therefore:
m is undefined
window.name becomes "hello"
This matches option B.
JavaScript Knowledge Reference (text-only)
Calling a function without new uses the global object as this in non-strict mode.
Constructor functions must use new to create a new object.
Functions without an explicit return return undefined.

NEW QUESTION # 89
A developer has the function, shown below, that is called when a page loads.
function onload() {
console.log("Page has loaded!");
}
Where can the developer see the log statement after loading the page in the browser?

A. Browser performance toots
B. Terminal running the web server.
C. On the webpage.
D. Browser javaScript console

Answer: D

NEW QUESTION # 90
A developer is creating a simple webpage with a button. When a userclicks this button for the first time, a message is displayed.
The developer wrote the JavaScript code below, but something is missing. The message gets displayed every time a user clicks the button, instead of just the first time.
01 functionlisten(event) {
02 alert ( 'Hey! I am John Doe') ;
03 button.addEventListener ('click', listen);
Which two code lines make this code work as required?
Choose 2 answers

A. On line 06, add an option called once to button.addEventListener().
B. On line 02, use event.first to test if it is the first execution.
C. On line 04, useevent.stopPropagation ( ),
D. On line 04, use button.removeEventListener(' click" , listen);

Answer: A,D

NEW QUESTION # 91
Which statement accurately describes the behavior of the async/await keywords?

A. The associated function can only be called via asynchronous methods.
B. The associated class contains some asynchronous functions.
C. The associated function is asynchronous, but acts like synchronous code.
D. The associated function sometimes returns a promise.

Answer: C

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge When async is added to a function:
async function example() {}
JavaScript guarantees:
The function always returns a Promise, regardless of what is returned inside.
Inside the function, await pauses execution until a Promise resolves.
Code appears synchronous even though it uses asynchronous behavior.
Analysis of each option:
A incorrect:
Not "sometimes"-an async function always returns a Promise.
B incorrect:
Async functions can be called just like normal functions.
C incorrect:
Async/await has nothing to do with classes specifically.
D correct:
This is the standard description:
"Async functions behave asynchronously but allow writing code that looks synchronous."
________________________________________
JavaScript Knowledge Reference (text-only)
async functions always return Promises.
await pauses execution of the async function.
Async/await syntax creates synchronous-looking code on top of asynchronous operations.

NEW QUESTION # 92
......

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