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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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

NEW QUESTION # 65
Which two console logs output NaN?
Choose 2 answers | |

A. console.log(10 / 0);
B. console.log(10 / Number('5) ) ;
C. console.log(parseInt ' ("two')) ;
D. console.loeg(10 / 'five');

Answer: C,D

NEW QUESTION # 66
The developer wants to test this code:
Const toNumber =(strOrNum) => strOrNum;
Which two tests are most accurate for this code?
Choose 2 answers

A. console.assert(Number.isNaN(toNumber()));
B. console.assert(toNumber('2') === 2);
C. console.assert(toNumber('-3') < 0);
D. console.assert(toNumber () === NaN);

Answer: B,C

NEW QUESTION # 67
Refer to the following code block:
class Animal{
constructor(name){
this.name = name;
}
makeSound(){
console.log(`${this.name} is making a sound.`)
}
}
class Dog extends Animal{
constructor(name){
super(name)
this.name = name;
}
makeSound(){
console.log(`${this.name} is barking.`)
}
}
let myDog = new Dog('Puppy');
myDog.makeSound();
What is the console output?

A. Puppy is barking

Answer: A

NEW QUESTION # 68
Refer to the following code that imports a module named Utills,
Which two implementations of Utill, je export foo and bar such that the code above runs without error?
Choose 2 answers

A. Const foo = ( ) => ( return 'foo; ; )
Const bar => => { return 'bar ';}
Export default foo, bar;
B. Const foo = () => ( return 'foo ' ; )
Const bar => ( return 'bar' ; )
Export (foo, bar)
C. Export default class (
Foo ( ) ( return 'foo ,; )
Bar ( ) ( return ;bar ; )
D. //FooUtill.js and barUtils, js exist
Import (foo) from ,/Path/footUtils.js,:
Export (foo, bar)

Answer: C

NEW QUESTION # 69
Given the JavaScript below:

Which code should replace the placeholder comment on line 06 to hide accounts that do not match the search string?

A. 'None' : 'block'
B. 'Block' : 'none'
C. 'Hidden, visible
D. 'Visible : 'hidden'

Answer: B

NEW QUESTION # 70
......

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