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| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer - Multiple Choice |
| Exam Number: | JS-Dev-101 |
| Exam Duration: | 105 minutes |
| Real Exam Qty: | 60 scored + up to 5 unscored |
| Passing Score: | 65% |
| Related Certifications: | Salesforce Certified Developer Salesforce Certified Platform Developer I |
| Exam Format: | Multiple select, Multiple choice |
| Certificate Validity Period: | Does not expire; requires maintenance updates |
| Available Languages: | English, Japanese |
| Exam Price: | USD 200 |
| 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 Detail Explanation <<
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NEW QUESTION # 80
01 let obj = {
02 fool 1,
03 bari 2
04 )
05 let output = [7#
08 output .push (something);
09 )
10
11 conssie.tog (output):
What is the outpouf tlin e 117
Answer: D
NEW QUESTION # 81
A developer uses a parsed JSON string to work with user information as in the block below:
01 const userInformation ={
02 " id " : "user-01",
03 "email" : "user01@universalcontainers.demo",
04 "age" : 25
Which two options access the email attribute in the object?
Choose 2 answers
Answer: C,D
NEW QUESTION # 82
Given:
const str = 'Salesforce';
Which two statements result in 'Sales'?
Answer: A,B
Explanation:
str = 'Salesforce'
Index positions:
S(0) a(1) l(2) e(3) s(4) f(5) o(6) r(7) c(8) e(9)
substring(start, end)
Start index inclusive, end index exclusive.
str.substring(0, 5) → characters at indices 0-4 → "Sales"
str.substring(1, 5) → indices 1-4 → "ales"
substr(start, length)
Start index, then number of characters.
str.substr(0, 5) → 5 characters starting at index 0 → "Sales"
str.substr(1, 5) → 5 characters from index 1 → "alesf"
So the expressions that return "Sales" are A and C.
NEW QUESTION # 83
Refer to the code below:
01 let country = {
02 get capital() {
03 let city = Number("London");
04
05 return {
06 cityString: city.toString(),
07 }
08 }
09 }
Which value can a developer expect when referencing country.capital.cityString?
Answer: D
Explanation:
In the getter:
let city = Number("London");
The Number() constructor attempts to convert the string "London" into a numeric value.
"London" is not a valid numeric string.
When JavaScript attempts numeric conversion of a non-numeric string:
Number("London") → NaN
Next line:
city.toString()
When city is NaN, calling .toString() yields:
NaN.toString() → "NaN"
The getter returns:
{
cityString: "NaN"
}
The question asks:
Which value can a developer expect?
The multiple-choice options include NaN, but not "NaN".
Given the available choices, the intended correct answer is B (NaN) because the root cause is the Number("London") conversion returning NaN.
JavaScript Knowledge Reference (text-only)
Number(nonNumericString) returns NaN.
NaN.toString() produces "NaN".
Getters compute and return their values each time the property is accessed.
NEW QUESTION # 84
Code:
01 const sayHello = (name) => {
02 console.log('Hello ', name);
03 };
04
05 const world = () => {
06 return 'World';
07 };
08
09 sayHello(world);
This does not print "Hello World".
What change is needed?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Currently:
sayHello expects a value name and prints it.
world is a function that returns 'World'.
sayHello(world); passes the function object itself, not the result of calling it.
So name inside sayHello is a function, not the string "World".
To keep the call sayHello(world) yet get "World", sayHello must call the function parameter:
const sayHello = (name) => {
console.log('Hello', name());
};
Now:
sayHello(world) passes the function.
Inside sayHello, name() calls world(), which returns "World".
The console logs "Hello World".
Why the others are wrong:
B: Changing line 7 to }(); would attempt to IIFE the function definition and break the declaration.
C: sayHello(world)() would try to call the return value of sayHello, which is undefined, causing an error.
D: Changing world to a function declaration does not change the fact that it is passed as a function reference; sayHello still prints the function object, not 'World'.
________________________________________
NEW QUESTION # 85
......
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