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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Related Certifications: | Lightning Web Components Specialist Superbadge Salesforce Certified JavaScript Developer I |
| Exam Price: | $200 USD |
| Available Languages: | English |
| Certificate Validity Period: | Lifetime (No renewal required) |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| Exam Format: | Multiple Choice, Multiple Select |
| Exam Duration: | 105 minutes |
| Passing Score: | 65% |
| Sample Questions: | Salesforce JS-Dev-101 Sample Questions |
| Exam Way: | Online (Proctored) |
| Pre Condition: | Completion of the Lightning Web Components Specialist Superbadge is required to earn the full credential, though it can be completed before or after the exam. |
| Official Syllabus URL: | https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi |
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NEW QUESTION # 95
01 let a = "*";
02 let b = "**";
/ 7 x = 3;
04 console.log(a);
What is displayed when the code executes?
Answer: C
NEW QUESTION # 96
Given the code:
01 function GameConsole(name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log('${this.name} is loading a game: ${gamename}....');
07 }
08
09 function Console16bit(name) {
10 GameConsole.call(this, name);
11 }
12
13 Console16bit.prototype = Object.create(GameConsole.prototype);
14
15 // insert code here
16 console.log('${this.name} is loading a cartridge game: ${gamename}....');
17 }
18
19 const console16bit = new Console16bit('SNEGeneziz');
20 console16bit.load('Super Monic 3x Force');
What should a developer insert at line 15?
Answer: C
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge A subclass created by:
Console16bit.prototype = Object.create(GameConsole.prototype);
inherits all prototype methods from GameConsole, including load.
To override the inherited method, the correct syntax is to assign a new function to the method name on the prototype:
Console16bit.prototype.load = function(gamename) {
console.log(`${this.name} is loading a cartridge game: ${gamename}....`);
};
Why the other options are wrong:
A assigns something to the constructor function itself, not to the prototype method. Invalid.
B attempts to call a function in the left-hand side of an assignment; invalid syntax.
C also uses invalid syntax-prototype methods cannot be defined this way.
D is the correct definition of a prototype method override.
________________________________________
JavaScript Knowledge Reference (text-only)
Methods are overridden by assigning functions to Subclass.prototype.methodName.
Object.create() establishes prototype inheritance.
Constructor functions require prototype method attachment using assignment syntax.
NEW QUESTION # 97
A developer has an is Dog function that takes one argument cat. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?
Answer:
Explanation:
setInterval(isDog, 60000,'cat');
NEW QUESTION # 98
A developer is required to write a function that calculates the sum of elements in an array but is getting undefined every time the code is executed. The developer needs to find what is missing in the code below.
01 const sumFunction = arr => {
02 return arr.reduce((result, current) => {
03 //
04 result += current;
05 //
06 }, 10);
07 };
Which line replacement makes the code work as expected?
Answer: C
Explanation:
In a reduce callback, you must return the new accumulator value.
Currently:
(result, current) => {
result += current;
// no return
}
This returns undefined each time, so the accumulator becomes undefined on the next iteration, leading to incorrect results.
Fix by returning result:
const sumFunction = arr => {
return arr.reduce((result, current) => {
result += current;
return result; // line 05
}, 10);
};
Option D correctly adds the return.
Options A/B/C do not fix the missing return in the reducer and therefore do not resolve the core issue.
________________________________________
NEW QUESTION # 99
Which actions can be done using the JavaScript browser console?
Answer: C
Explanation:
The correct answer is B because the JavaScript browser console allows developers to interact with the current web page using JavaScript commands. Through the console, you can access the document object, inspect DOM elements, read their properties, and modify the structure or content of the page.
For example:
document.body.style.backgroundColor = "lightblue";
This changes the page's background color.
Another example:
document.querySelector("h1").textContent = "Updated Heading";
This changes the text of the first <h1> element on the page.
The DOM, or Document Object Model, is the browser's JavaScript representation of the HTML page. Since the console runs JavaScript in the context of the current page, it can be used to inspect and modify DOM elements directly.
Why the other options are incorrect:
A is not the best answer because although you can type general JavaScript expressions in the console, the browser console is mainly connected to the current page's execution environment. The question is asking about practical browser-console actions related to a page.
C is incorrect because performance reports are usually generated through tools such as the Performance panel or Lighthouse in browser developer tools, not directly through the JavaScript console.
D is incorrect because the console can modify the DOM and runtime values, but it does not permanently change the original JavaScript source code of the page. Any changes made through the console are temporary and disappear when the page reloads.
E is incorrect because security-protected cookies, such as HttpOnly cookies, cannot be viewed or changed using JavaScript. This is an intentional browser security feature that prevents client-side scripts from accessing sensitive cookie data.
Therefore, the best verified answer is B.
NEW QUESTION # 100
......
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