JS-Dev-101 Valid Exam Guide - Interactive JS-Dev-101 Questions

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Salesforce JS-Dev-101 Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q64-Q69):

NEW QUESTION # 64
Given the code below:
const delay = async delay =>{
return new Promise((resolve,reject)=>{
console.log(1);
setTimeout(resolve,deleay);
});
};
const callDelay =async ()=>{
console.log(2);
const yup = await delay(1000);
console.log(3);
}
console.log(4);
callDelay();
console.log(5);
What is logged to the console?

Answer:

Explanation:
4 2 1 5 3

NEW QUESTION # 65
Refer to the code below:
flag();
function flag() {
console.log('flag');
}
const anotherFlag = () => {
console.log('another flag');
}
anotherFlag();
What is result of the code block?

A. The console logs only 'flag'.
B. An error is thrown.
C. The console logs 'flag' and then an error is thrown.
D. The console logs 'flag' and 'another flag'.

Answer: D

Explanation:
Key points:
Function declarations are hoisted (their definitions are available before the line where they appear).
Function expressions assigned to const or let are not hoisted as callable functions, but here anotherFlag is only used after it is defined.
Step-by-step:
flag(); at the top:
flag is a function declaration defined later; due to hoisting, it is available.
It logs 'flag'.
The declaration:
function flag() {
console.log('flag');
}
is already in effect (hoisted before execution).
const anotherFlag = () => { console.log('another flag'); } defines anotherFlag as an arrow function.
anotherFlag(); is called after its definition; this is valid and logs 'another flag'.
No errors occur. The console output is:
flag
another flag
So option D is correct.
Concepts: function hoisting, difference between function declarations and function expressions, execution order.

NEW QUESTION # 66
Which code statement correctly retrieves and returns an object from localStorage?

A. const retrieveFromLocalStorage = () =>{return JSON.stringify(window.localStorage.getItem(storageKey));}
B. constretrieveFromLocalStorage = (storageKey) =>{return window.localStorage[storageKey];}
C. const retrieveFromLocalStorage = (storageKey) =>{return JSON.parse(window.localStorage.getItem(storageKey));}
D. const retrieveFromLocalStorage = (storageKey) =>{return window.localStorage.getItem(storageKey);}

Answer: C

NEW QUESTION # 67
Given the JavaScript below:
function onLoad() {
console.log("Page has loaded!");
}
Where can the developer see the log statement after loading the page in the browser?

A. On the browser JavaScript console
B. In the browser performance tools log
C. On the webpage console log
D. On the terminal console running the web server

Answer: A

Explanation:
console.log() in browser-side JavaScript writes output to the browser's JavaScript console, which is available in the browser's Developer Tools.
In a typical browser (Chrome, Firefox, Edge, etc.), you open DevTools and go to the Console tab.
Any console.log("Page has loaded!"); executed in page JavaScript will appear there.
Why A is correct:
The function onLoad is a client-side function (runs in the browser).
When it executes, the console.log call goes to the browser's JavaScript console, not the server.
Why the others are incorrect:
B . On the terminal console running the web server
That console shows logs from the server-side runtime (e.g., Node.js logs).
This code is clearly browser-side JavaScript (no Node.js or server context shown).
Therefore, the output does not appear in the terminal.
C . In the browser performance tools log
Performance tools (Timeline, Performance tab, etc.) show metrics about rendering, CPU time, network, etc., not generic console.log messages.
console.log messages appear in the Console tab, not in performance logs.
D . On the webpage console log
There is no built-in concept of a "webpage console log" UI rendered on the page itself by default.
Unless you explicitly code something to display logs in the DOM, console.log output is not visible on the page, only in Developer Tools.
Therefore, the correct place to see that log is:
Answe r: A
JavaScript knowledge / Study Guide references (concept names only, no links):
Browser Developer Tools - Console tab
console.log() in client-side JavaScript
Difference between client-side logs and server-side logs

NEW QUESTION # 68
Which actions can be done using the JavaScript browser console?

A. View and change security cookies
B. Display a report showing the performance of a page
C. View and change the DOM of the page
D. Change the DOM and the JavaScript code of the page
E. Run code that's not related to the page

Answer: C,D,E

Explanation:
A: Yes. You can run arbitrary JS in the console (even if it doesn't touch the page).
B: Yes. You can inspect and modify DOM nodes via JS.
C: Performance reports are mainly in the Performance tab, not the console.
D: Yes. You can alter the DOM and redefine or override JS functions/variables at runtime.
E: You can read and set document.cookie, but HttpOnly "security cookies" cannot be read or changed from JS.

NEW QUESTION # 69
......

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