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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
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
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
  • Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 5
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 6
  • 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.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q104-Q109):

NEW QUESTION # 104
A Developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three number in the array, The test passes:
Let res = sum2([1, 2, 3 ]) ;
console.assert(res === 6 );
Res = sum3([ 1, 2, 3, 4]);
console.assert(res=== 6);
A different developer made changes to the behavior of sum3 to instead sum all of the numbers present in the array. The test passes:
Which two results occur when running the test on the updated sum3 function ?
Choose 2 answers

Answer: C,D


NEW QUESTION # 105
Given the following code:
Let x =('15' + 10)*2;
What is the value of a?

Answer: B


NEW QUESTION # 106
Refer to the code below:
Const resolveAfterMilliseconds = (ms) => Promise.resolve (
setTimeout ((=> console.log(ms), ms ));
Const aPromise = await resolveAfterMilliseconds(500);
Const bPromise = await resolveAfterMilliseconds(500);
Await aPromise, wait bPromise;
What is the result of running line 05?

Answer: D


NEW QUESTION # 107
Refer to the code below
let inArray = [[1,2],[3,4,5]];
which two statements results in the array [1,2,3,4,5]?
choose 2 answer

Answer: A,B


NEW QUESTION # 108
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?

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
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:
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 # 109
......

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