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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Server-Side JavaScript	8%	- Command-line tools and scripts - Core Node.js modules - Module system and require/import - Node.js fundamentals and runtime
Topic 2: Asynchronous Programming	13%	- Async/await syntax - Promises and chaining - Event loop and micro/macro tasks - Fetch API and HTTP requests - Callbacks and callback hell
Topic 3: Objects, Functions, and Classes	25%	- Function definitions, parameters, and scope - Closures and execution context - Decorators and advanced function patterns - Object creation, properties, and methods - Class syntax, inheritance, and prototypes - Modules and imports/exports
Topic 4: Browsers and Events	17%	- Script loading and execution order - Browser APIs and Web Storage - Event handling, propagation, and delegation - Window and document object properties - Document Object Model (DOM) manipulation
Topic 5: Debugging and Error Handling	7%	- Console methods and logging - Error types and exception handling - Defensive programming practices - Debugging tools and breakpoints
Topic 6: Testing	7%	- Test doubles and mocks - Testing frameworks and assertions - Unit testing concepts - Code coverage and best practices
Topic 7: Variables, Types, and Collections	23%	- Array methods and data manipulation - Type coercion and conversion rules - JSON parsing and usage - Working with strings, numbers, dates, and booleans - Variable declaration and initialization - Truthy and falsy values

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q107-Q112):

NEW QUESTION # 107
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.'?

A. This.plate =plate;
B. Super.plate =plate;
C. super(plate);
D. Vehicle.plate = plate;

Answer: C

NEW QUESTION # 108
A developer wants to iterate through an array of objects and count the objects and count
the objects whose property value, name, starts with the letter N.
Const arrObj = [{"name" : "Zach"} , {"name" : "Kate"},{"name" : "Alise"},{"name" : "Bob"},{"name" :
"Natham"},{"name" : "nathaniel"}
Refer to the code snippet below:
01 arrObj.reduce(( acc, curr) => {
02 //missing line 02
02 //missing line 03
04 ). 0);
Which missing lines 02 and 03 return the correct count?

A. Const sum = curr.name.startsWIth('N') ? 1: 0;
Return curr+ sum
B. Const sum = curr.startsWIth('N') ? 1: 0;
Return curr+ sum
C. Const sum = curr.name.startsWith('N') ? 1: 0;
Return acc +sum
D. Const sum = curr.startsWith('N') ? 1: 0;
Return acc +sum

Answer: C

NEW QUESTION # 109
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
05 };
Which two options access the email attribute in the object?

A. userInformation.email
B. userInformation[email]
C. userInformation.get( " email " )
D. userInformation[ " email " ]

Answer: A,D

Explanation:
userInformation is a plain JavaScript object:
{
id: " user-01 " ,
email: " user01@universalcontainers.demo " ,
age: 25
}
You can access object properties in two standard ways:
* Dot notation : object.propertyName
* Bracket notation : object[ ' propertyName ' ]
Apply to each option:
* A. userInformation.email
* Correct dot notation; accesses " user01@universalcontainers.demo " .
* B. userInformation.get( " email " )
* .get() is a method on Map instances, not on plain objects.
* A regular object does not have a .get method; this would be TypeError.
* C. userInformation[ " email " ]
* Correct bracket notation; string " email " is used as the property key.
* Returns " user01@universalcontainers.demo " .
* D. userInformation[email]
* Here email is treated as a variable, not a string literal.
* Unless there is a variable named email defined with a value matching a property key, this will either:
* Throw a ReferenceError (if email is not defined), or
* Use the value of email as a computed key (not what is intended here).
* It is not the correct way to access the " email " property literal.
Therefore, the correct ways are:
The answer: A, C
Relevant concepts: object property access (. vs []), plain objects vs Map, literal property names vs computed property names.

NEW QUESTION # 110
developer wants to use a module named universalContainersLib and them call functions from it.
How should a developer import every function from the module and then call the functions foo and bar ?

A. import (foo, bar) from '/path/universalContainersLib.js';
foo();
bar();
B. import * ad lib from '/path/universalContainersLib.js';
lib.foo();
lib.bar();
C. import * from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();
D. import all from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();

Answer: B

NEW QUESTION # 111
Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as (3, 4, 5)?
Choose 3 answers

A. Let x = arr.alice (2) ;
B. Let x = arr. Slince (2, 3);
C. Let x = arr.aplice (2, 3);
D. Let x = arr.filter( (a) => )return a > 2 )) ;
E. Let x = arr.filter( (a) => ( a < 2)) ;

Answer: A,C,D

NEW QUESTION # 112
......

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