JavaScript-Developer-I New Braindumps Questions, JavaScript-Developer-I Reliable Exam Answers

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

>> JavaScript-Developer-I New Braindumps Questions <<

Quiz 2026 Updated Salesforce JavaScript-Developer-I New Braindumps Questions

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q95-Q100):

NEW QUESTION # 95
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.

Which two results occur when running this test on the updated sum3 function?
Choose 2 answers

A. Theline 02 assertion fails.
B. The line 02 assertion passes.
C. The line 05 assertion fails.
D. The line 05 assertion passes.

Answer: B,C

NEW QUESTION # 96
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 letterN.
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 correctcount?

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

Answer: A

NEW QUESTION # 97
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. Vehicle.plate = plate;
B. super(plate);
C. Super.plate =plate;
D. This.plate =plate;

Answer: B

NEW QUESTION # 98
Given the following code, what is the value of x?
let x = '15' + (10 * 2);

A. 0
B. 1
C. 2
D. 3

Answer: C

NEW QUESTION # 99
Given the code below:
01 setCurrentUrl();
02 console.log( " The current URL is: " + url);
03
04 function setCurrentUrl() {
05 url = window.location.href;
06 }
What happens when the code executes?

A. The url variable has global scope and line 02 executes correctly.
B. The url variable has local scope and line 02 executes correctly.
C. The url variable has global scope and line 02 throws an error.
D. The url variable has local scope and line 02 throws an error.

Answer: A

Explanation:
* Inside setCurrentUrl, url is assigned without var, let, or const :
url = window.location.href;
* In non-strict mode, this implicitly creates a global variable url on window.
Execution order:
* setCurrentUrl(); creates/sets global url to window.location.href.
* console.log( " The current URL is: " + url); has access to url in global scope and prints correctly.
Thus:
* url has global scope.
* Line 02 runs without error and logs a valid string.
So B is correct.

NEW QUESTION # 100
......

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