JavaScript-Developer-I Test Vce, Real JavaScript-Developer-I Question

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Variables, Types, and Collections	23%	- Strings, numbers, and dates - Type coercion and conversion - Arrays and collections - JSON parsing and manipulation - Primitive and complex data types - Truthy and falsy evaluations - Variable declarations and initialization
Debugging and Error Handling	7%	- Console methods for debugging - Error handling techniques (try/catch/finally) - Breakpoints and code inspection - Custom error types
Asynchronous Programming	13%	- Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Callbacks - Event loop and execution flow - Async/Await syntax
Server Side JavaScript	8%	- Core Node.js modules - Package management (npm) - Server-side JavaScript implementations - Node.js fundamentals - CLI commands
Testing	7%	- Writing and modifying unit tests - Unit testing concepts - Test coverage and reliability - Test effectiveness evaluation
Objects, Functions, and Classes	25%	- Execution flow and context - Higher-order functions - Variable scope and closures - Modules and decorators - Prototypal inheritance - Function declarations and expressions - Object creation and manipulation - Arrow functions - ES6 classes and inheritance
Browser and Events	17%	- Event propagation (bubbling and capturing) - Event handling and listeners - Browser Developer Tools usage - DOM manipulation - Interacting with forms and user input - Browser-specific APIs

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q69-Q74):

NEW QUESTION # 69
Given the following code:

What will be the first four numbers logged?

A. 0112
B. 0123
C. 0122
D. 0012

Answer: C

NEW QUESTION # 70
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
Will establish a web socket connection and handle receipt of messages to theserver Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?

A. ws.connect (( ) => {console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};
B. ws.on ('connect', ( ) => {console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' ,error); });});
C. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
D. try{ws.connect (( ) => {console.log('connected to client'); });} catch(error) { console.log('ERROR',error); };}

Answer: B

NEW QUESTION # 71
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?

A. const addBy = function(num1) {
return num1 * num2;
}
B. const addBy = function(num1) {
return function(num2) {
return num1 + num2;
}
}
C. const addBy = (num1) = > num1 + num2;
D. (Corrected for typing errors)
const addBy = (num1) = > {
return function(num2) {
return num1 + num2;
}
}

Answer: B,D

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 # 72
Refer to the following code:
Let obj ={
Foo: 1,
Bar: 2
}
Let output =[],
for(let something in obj{
output.push(something);
}
console.log(output);
What is the output line 11?

A. ["bar","foo"]
B. ["foo:1","bar:2"]
C. [1,2]
D. ["foo","bar"]

Answer: D

NEW QUESTION # 73
Refer to the following code that performs a basic mathematical operation on a provided input:
function calculate(num) {
Return (num +10) / 3;
}
How should line 02 be written to ensure that x evaluates to 6 in the line below?
Let x = calculate (8);

A. Return Number((num +10) /3 );
B. Return Integer(num +10) /3;
C. Return (Number (num +10 ) / 3;
D. Return Number(num + 10) / 3;

Answer: C

NEW QUESTION # 74
......

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