JavaScript-Developer-I Latest Test Practice, Reliable JavaScript-Developer-I Exam Price

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q37-Q42):

NEW QUESTION # 37
Refer to the code below:

What is the value result after line 10 executes?

A. Error: myfather.job is not a function
B. John undefined
C. Undefined Developer
D. John Developer

Answer: A

NEW QUESTION # 38
A developer wants to set up a secure web server with Node.js. The developer create a directory locally called app-server, and the first file is app-server/index, js.
Without using any third-party libraries, what should the developer add to index, js to create the secure web server?

A. Const http = require ('http');
B. Const server = require ( 'secure-server') ;
C. Const tls = require ('tls') ;
D. Const http = require ('https') ;

Answer: D

NEW QUESTION # 39
Refer to the following code:
Let sampletext = 'The quick brown fox Jumps';
A developer need to determine if a certain substring is part of a string.
Which three expressions return true for the give substring? Choose 3 answers

A. sampleText.indexof ('quick') 1== -1;
B. sampleText.includes (fox' , 3);
C. sampleText.substing ('fox');
D. sampleText.inclides (fox');
E. sampleText.includes (quick', 4);

Answer: B

NEW QUESTION # 40
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];

Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?

A. Let arr2 = arr1.sort();
B. Let arr2 = arr1.slice(0, 5);
C. Let arr2 = arr1;
D. Let arr2 = Array.from(arr1);

Answer: B,D

NEW QUESTION # 41
Refer to the code below:

What are the values for first and second once the executes?

A. First is why and second is where.
B. First is who and second is when.
C. First is why and second is when.
D. First is who and second is where.

Answer: A

NEW QUESTION # 42
......

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