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Salesforce JS-Dev-101 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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.
Topic 2
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 3
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q45-Q50):

NEW QUESTION # 45
A developer is leading the creation of a new browser application that will serve a single page application. The team wants to use a new web framework Minimalsit.js.The Lead developer wants to advocate for a more seasoned web framework that already has a community around it.
Which two frameworks should the lead developer advocate for?
Choose 2 answers

Answer: B,C


NEW QUESTION # 46
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: A

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 # 47
A developer copied a JavaScript object:
01 function Person() {
02 this.firstName = "John";
03 this.lastName = "Doe";
04 this.name = () => `${this.firstName},${this.lastName}`;
05 }
06
07 const john = new Person();
08 const dan = Object.assign({}, john);
09 dan.firstName = 'Dan';
How does the developer access dan's firstName, lastName?

Answer: C

Explanation:
Person instances have:
firstName and lastName as string properties.
A name method that returns a combined string: `${this.firstName},${this.lastName}`.
Object.assign({}, john) creates a shallow copy of john into a new object, dan.
After:
dan.firstName = 'Dan';
dan.name() returns "Dan,Doe".
Analysis of options:
A: dan.firstName() and dan.lastName() are function calls, but firstName/lastName are strings, not functions → TypeError.
B: Calls the defined method and uses both names correctly.
C: dan.name is a function reference; you'd still need to call it: dan.name().
D: dan.firstName + dan.lastName is "DanDoe", no separator. It accesses the properties but not in the method the developer defined.
The intended way, using the provided API, is dan.name().


NEW QUESTION # 48
Refer to HTML below:
<div id ="main">
<div id = " card-00">This card is smaller.</div>
<div id = "card-01">The width and height of this card is determined by its contents.</div>
</div>
Which expression outputs the screen width of the element with the ID card-01?

Answer: B


NEW QUESTION # 49
Refer to the following object.

How can a developer access the fullName property for dog?

Answer: A


NEW QUESTION # 50
......

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