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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I - Multiple Choice Exam (JS-Dev-101) |
| Exam Number: | JS-Dev-101 |
| Exam Format: | Multiple Choice Questions, Multiple Select Questions |
| Certificate Validity Period: | 1 year (maintenance required annually in Salesforce certification program) |
| Available Languages: | English |
| Related Certifications: | Salesforce Platform Developer II Salesforce Platform Developer I |
| Real Exam Qty: | 60 (multiple choice) |
| Exam Duration: | 105 minutes |
| Passing Score: | 65% |
| Exam Price: | $200 USD |
| Recommended Training: | MDN Web Docs - JavaScript Guide Salesforce Trailhead - JavaScript Developer I |
| Exam Registration: | Salesforce Certification Registration Kryterion Webassessor (Exam Delivery) |
| Sample Questions: | Salesforce JS-Dev-101 Sample Questions |
| Exam Way: | Online proctored exam via Salesforce authorized testing platform (e.g., Webassessor) |
| Pre Condition: | No formal prerequisites, but familiarity with JavaScript and web development is recommended. |
| Official Syllabus URL: | https://trailhead.salesforce.com/credentials/javascriptdeveloper |
>> JS-Dev-101 Valid Test Preparation <<
The Salesforce JS-Dev-101 certification exam is a valuable asset for beginners and seasonal professionals. If you want to improve your career prospects then JS-Dev-101 certification is a step in the right direction. Whether you’re just starting your career or looking to advance your career, the Salesforce JS-Dev-101 Certification Exam is the right choice.
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NEW QUESTION # 16
Given the following code:
document.body.addEventListener(' click ', (event) => {
if (/* CODE REPLACEMENT HERE */) {
console.log('button clicked!');
)
});
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?
Answer: C
NEW QUESTION # 17
Given the following code:
01 let x = null;
02 console.log(typeof x);
What is the output of line 02?
Answer: D
Explanation:
This question focuses on the typeof operator and how JavaScript represents the type of the value null.
Declaration on line 1:
let x = null;
Here:
x is explicitly assigned the value null.
In JavaScript, null is a special primitive value that represents "no value" or "empty value".
Line 2:
console.log(typeof x);
The typeof operator returns a string indicating the type of the operand. For example:
typeof 1 returns "number"
typeof "hello" returns "string"
typeof true returns "boolean"
typeof undefined returns "undefined"
typeof {} returns "object"
typeof [] returns "object" (arrays are objects)
typeof function() {} returns "function"
For null, due to an early design decision in JavaScript, the result is:
typeof null === "object"
This is a known historical quirk of the language:
Although null is a primitive and conceptually means "no object", typeof null returns the string "object".
Therefore, typeof x when x is null evaluates to "object".
So on line 2, the value printed is:
"object"
This matches option A.
The incorrect options are:
B . "undefined": would be typeof x if x were undefined, not null.
C . "x": typeof returns a string describing the type of the value, not the variable name.
D . "null": although intuitive, JavaScript does not return "null" for typeof null; it returns "object" instead.
Therefore, the correct answer is:
Answe r: A
JavaScript knowledge / study guide reference concepts:
typeof operator and its return values
Primitive types in JavaScript (null, undefined, number, string, boolean, symbol, bigint) Historical behavior: typeof null returning "object" Difference between null and undefined in JavaScript
NEW QUESTION # 18
Refer to the code declarations below:
let st=1 = 'Java';
let st=2 = 'Script';
Which three expressions return the string `JavaScript`?
Choose 3 answers
Answer: A,B,E
NEW QUESTION # 19
Given the code below:
01 function Person() {
02 this.firstName = 'John';
03 }
04
05 Person.proto = {
06 job: x => 'Developer'
07 });
08
09 const myFather = new Person();
10 const result = myFather.firstName + ' ' + myFather.job();
What is the value of result when line 10 executes?
Answer: A
Explanation:
Person.proto is being set, but JavaScript uses Person.prototype for the prototype chain, not Person.proto.
Therefore, job is not on Person.prototype, and instances of Person do not have job via prototype.
myFather is created with new Person(), so:
myFather.firstName is 'John'.
myFather.job is undefined.
Attempting to call myFather.job() results in:
TypeError: myFather.job is not a function
So option A is correct.
NEW QUESTION # 20
Refer to the code below:
01 const myFunction = arr => {
02 return arr.reduce((result, current) => {
03 return result + current;
04 }, 10);
05 }
What is the output of this function when called with an empty array?
Answer: A
Explanation:
Comprehensive and Detailed Explanation From JavaScript Knowledge:
We call:
myFunction([]);
Inside:
arr.reduce((result, current) => {
return result + current;
}, 10);
Key points about Array.prototype.reduce:
Signature: array.reduce(callback, initialValue)
If initialValue is provided and the array is empty, reduce:
Does not call the callback at all.
Simply returns initialValue.
Here:
arr is [] (empty).
initialValue is 10.
So:
No iterations of the callback happen (no elements to process).
The return value is the initial value: 10.
So the actual output is:
myFunction([]) === 10;
Among the options:
A: 0 - incorrect, because the initial value is 10, not 0.
B: Throws an error - reduce throws only if the array is empty and there is no initialValue. Here we have an initial value, so no error.
C: NaN - there is no arithmetic with undefined or invalid values; we just return 10.
D: Returns 5 - the numeric value given is wrong; the correct value is 10.
Given the logic, the correct conceptual result is 10. The option text "Returns 5" is almost certainly a typo for "Returns 10". Since the letter that is intended to represent the correct behavior is D, we keep:
Study Guide / Concept Reference (no links):
Array.prototype.reduce behavior with initialValue
Behavior of reduce on an empty array with and without initialValue
Return value when no iterations run
________________________________________
NEW QUESTION # 21
......
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