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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q65-Q70):

NEW QUESTION # 65
A test has a dependency on database. query. During the test, the dependency is replaced with an object called database with the method, Calculator query, that returns an array. The developer does not need to verify how many times the method has been called.
Which two test approaches describe the requirement?
Choose 2 answers

A. Black box
B. White box
C. Substitution
D. Stubbing

Answer: B,C

NEW QUESTION # 66
Given two expressions var1 and var2, what are two valid ways to return the logical AND of the two expression and ensure it is data type Boolean? Choose 2 answers

A. Boolean (var1 && var2)
B. Boolean (var1) && Boolean (var2)
C. Var1. Toboolean ( ) && var2, to Boolean ( )
D. Var1 && var2

Answer: A,C

NEW QUESTION # 67
Refer to the following code:

Which statement should be added to line 09 for the code to display. The truck 123AB has a weight of 5000 Ib. '?

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

Answer: A,B,D

NEW QUESTION # 68
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?

A. > 5 >undefined
B. > 5 > 0
C. > 5 > -1
D. > true > false

Answer: A

NEW QUESTION # 69
Refer to the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));

When does Promise.finally on line 08 get called?

A. When resolved or rejected
B. When rejected
C. When resolved and settled
D. WHen resolved

Answer: A

NEW QUESTION # 70
......

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