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Salesforce JavaScript-Developer-I Certification Exam covers a variety of topics related to the development of custom applications on the Salesforce platform using JavaScript. These topics include but are not limited to data modeling, server-side development, client-side development, security, testing, and deployment. JavaScript-Developer-I Exam also covers the use of Lightning Web Components, Aura Components, and other Salesforce development tools and technologies.

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Salesforce JavaScript-Developer-I Certification Exam consists of 60 multiple-choice questions that must be completed within 105 minutes. JavaScript-Developer-I exam focuses on a range of topics, including JavaScript fundamentals, Apex, Visualforce, and Lightning components. A passing score of 68% is required to earn the certification.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q68-Q73):

NEW QUESTION # 68
Refer to the code below:
01 const addBy = ?
02 const addByEight = addBy(8);
03 const sum = addByEight(50);
Which two functions can replace line 01 and return 58 to sum?

Answer: A,C

Explanation:
We want:
const addByEight = addBy(8);
const sum = addByEight(50);
And we need sum to be 58.
That means:
* addBy(8) must return a function.
* That returned function, when called with 50, must compute 8 + 50.
So addBy must be a higher-order function that returns another function capturing num1 and later using it with num2 (a closure).
* Option A
const addBy = function(num1) {
return function(num2) {
return num1 + num2;
}
}
Step-by-step:
* Call addBy(8):
* num1 is 8.
* The function returns an inner function: function(num2) { return num1 + num2; }.
* So addByEight becomes this inner function, with num1 closed over as 8.
* Then call addByEight(50):
* num2 is 50.
* The body computes num1 + num2, i.e., 8 + 50 = 58.
Therefore, with Option A in place:
const addByEight = addBy(8); // returns inner function
const sum = addByEight(50); // 58
So sum is 58. Option A is correct.
* Option D (corrected)
const addBy = (num1) = > {
return function(num2) {
return num1 + num2;
}
}
This is essentially the same logic expressed with an arrow function for the outer function:
* Call addBy(8):
* num1 is 8.
* Returns the inner function function(num2) { return num1 + num2; }.
* Call addByEight(50):
* num2 is 50.
* Computes num1 + num2 # 8 + 50 = 58.
So again:
const addByEight = addBy(8); // inner function with num1 = 8
const sum = addByEight(50); // 58
Option D is also correct.
Thus, A and D are the two functions that satisfy the requirement.
* Why B and C are incorrect
Option B:
const addBy = function(num1) {
return num1 * num2;
}
* This does not return a function; it returns a value.
* addBy(8) returns 8 * num2, but num2 is not defined in this scope, which would cause a ReferenceError.
* Also, addByEight would be a number (if num2 existed), not a function, so addByEight(50) would fail.
Option C:
const addBy = (num1) = > num1 + num2;
* Again, addBy returns a value, not a function.
* addBy(8) returns 8 + num2, but num2 is not defined, so this is also invalid due to ReferenceError.
* addByEight would be a number (or error), not a function.
Neither B nor C creates the required closure nor returns a function to be called later.
References / Study Guide concepts (no links):
* Higher-order functions in JavaScript
* Closures: inner functions capturing outer variables (num1)
* Arrow functions vs function expressions
* Returning functions from functions (function factories / currying)
* Scope and ReferenceError when a variable is not defined


NEW QUESTION # 69
Refer to following code:
class Vehicle {
constructor(plate) {
This.plate =plate;
}
}
Class Truck extends Vehicle {
constructor(plate, weight) {
//Missing code
This.weight = weight;
}
displayWeight() {
console.log('The truck ${this.plate} has a weight of ${this.weight} lb.');}}
Let myTruck = new Truck('123AB', 5000);
myTruck.displayWeight();
Which statement should be added to line 09 for the code to display 'The truck 123AB has a
weight of 5000lb.'?

Answer: C


NEW QUESTION # 70
Given the expressions var1 and var2, what are two valid ways to return the concatenation of the two expressions and ensure it is string? Choose 2 answers

Answer: B,C


NEW QUESTION # 71
Refer to the code below:

What is the value of result when Promise. race executes?

Answer: B


NEW QUESTION # 72
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 # 73
......

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