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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer - Multiple Choice |
| Exam Number: | JS-Dev-101 |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Available Languages: | English, Japanese |
| Related Certifications: | Salesforce Certified Platform Developer I Salesforce Certified Developer |
| Passing Score: | 65% |
| Certificate Validity Period: | Does not expire; requires maintenance updates |
| Exam Price: | USD 200 |
| Exam Duration: | 105 minutes |
| Exam Format: | Multiple select, Multiple choice |
| Recommended Training: | Trailhead JavaScript Developer I Certification Prep |
| Exam Registration: | Salesforce Certification Registration |
| Sample Questions: | Salesforce JS-Dev-101 Sample Questions |
| Exam Way: | Online proctored or onsite at authorized testing centers |
| Pre Condition: | No formal prerequisites; recommended: strong JavaScript fundamentals, ES6+ experience, web development familiarity |
| Official Syllabus URL: | https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101 |
>> JS-Dev-101 Practice Online <<
We strongly recommend using our JS-Dev-101 exam dumps to prepare for the Salesforce JS-Dev-101 certification. It is the best way to ensure success. With our Salesforce JS-Dev-101 Practice Questions, you can get the most out of your studying and maximize your chances of passing your Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) exam.
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NEW QUESTION # 118
Given two expressions, `exp1` and `exp2`, which two valid ways to return the logical AND of the two expressions and ensure it is a boolean?
Answer: B,C
NEW QUESTION # 119
Refer to the following code (correcting the missing template literal backticks):
let codeName = 'Bond';
let sampleText = `The name is ${codeName}, Jim ${codeName}`;
A developer is trying to determine if a certain substring is part of a string.
Which three code statements return true?
Answer: A,B,C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
First, compute sampleText:
let codeName = 'Bond';
let sampleText = `The name is ${codeName}, Jim ${codeName}`;
The template literal evaluates to:
"The name is Bond, Jim Bond"
Now evaluate each statement:
Option A: sampleText.includes('Jim');
String.prototype.includes(substring) returns true if substring occurs anywhere in the string.
sampleText clearly contains "Jim" ("The name is Bond, Jim Bond").
So this returns true.
Option B: sampleText.includes('The', 1);
includes(searchString, position) starts searching from the given position index.
"The name is Bond, Jim Bond" has "The" starting at index 0.
Starting search at index 1 means "The" at index 0 is not considered, and there is no second "The".
So this returns false.
Option C: sampleText.includes('Jim', 4);
"Jim" appears after "The name is Bond, " which is longer than 4 characters; the index of "Jim" is well past 4.
So when searching from index 4, "Jim" is still found.
This returns true.
Option D: sampleText.indexOf('Bond') !== -1;
String.prototype.indexOf(substring) returns:
-1 if the substring is not found,
Otherwise, the starting index of the first occurrence.
"Bond" appears twice in "The name is Bond, Jim Bond".
So sampleText.indexOf('Bond') is some non-negative index (for the first occurrence).
Therefore indexOf('Bond') !== -1 is true.
Option E: sampleText.substring('Jim');
substring expects numeric indexes: substring(startIndex, endIndex?).
If given a string "Jim" as the argument, JavaScript coerces it to a number:
Number('Jim') → NaN
NaN for startIndex is treated as 0.
So sampleText.substring('Jim') is effectively sampleText.substring(0), which returns the full string "The name is Bond, Jim Bond".
This is a string, not a boolean. The question asks "which code statements return true?" This statement returns a string, not the boolean value true.
Thus, the three statements that actually return true (boolean) are:
Study Guide / Concept Reference (no links):
Template literals and ${} interpolation
String.prototype.includes(searchString, position?)
String.prototype.indexOf(substring) and checking for !== -1
String.prototype.substring(start, end?) and argument coercion
Boolean vs non-boolean return types in string methods
________________________________________
NEW QUESTION # 120
A developer at Universal Containers is creating their new landing pagebased on HTML, CSS, and JavaScript. The website includes multiple external resources that are loaded when the page is opened.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed when the webpage isloaded and there is no need to wait for the resources to be available.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?
Answer: A
NEW QUESTION # 121
Refer to the code snippet:
01 function getAvailableilityMessage(item) {
02 if (getAvailableility(item)) {
03 var msg = "Username available";
04 }
05 return msg;
06 }
What is the return value of msg when getAvailableilityMessage("newUserName") is executed and getAvailableility("newUserName") returns false?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Key details:
var has function scope, not block scope.
Declaration var msg is hoisted to the top of the function, but initialization only happens if the if condition is true.
Effectively, the function behaves like:
function getAvailableilityMessage(item) {
var msg; // hoisted declaration
if (getAvailableility(item)) {
msg = "Username available";
}
return msg;
}
Now, given:
getAvailableility("newUserName") returns false.
Execution:
The if condition is false, so the body does not execute.
Therefore msg is declared but never assigned.
In JavaScript, an uninitialized variable that has been declared with var has the value undefined.
Thus:
return msg; // returns undefined
Why other options are wrong:
A: "newUserName" - msg never receives the parameter value; it's only set to "Username available" inside the if, which does not run.
B: "msg is not defined" - That kind of error occurs if msg were never declared. Here it is declared via var, so it is defined but undefined.
D: "Username available" - This would require the if branch to run, which it does not when getAvailableility(...) is false.
So the return value is:
undefined
Study Guide Concepts:
var hoisting and function scope
Uninitialized variables default to undefined
Control flow and conditional initialization
________________________________________
NEW QUESTION # 122
Refer to the string below.
Const str='Salesforce';
Which two statementsresults in the word 'Sales'?
Answer:
Explanation:
See the Answer below in explanation
NEW QUESTION # 123
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