JavaScript-Developer-I Test Practice - JavaScript-Developer-I Latest Test Answers

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q67-Q72):

NEW QUESTION # 67
A class was written to represent items for purchase in an online store, and a second class representing items that are on sale at a discounted price. The constructor sets the name to the first value passed in. The pseudocode is below:

There is a new requirement for a developer to implement a description method that will retrun a brief description for item and saleitem.

What is the out when executing the code above?

A. This is a Scarf
Unicaught TypeError: saleitem, description is not a function
This is a Scarf
This is a discounted Shirt
B. This is a Scarf
This is a Shirt
This is a discounted Scard
This is a discounted Shirt
C. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt
D. This is a Scaf
Uncaught TypeError: saleItem, description is not a function
This is a Shirt
This is a discounted Shirt

Answer: C

NEW QUESTION # 68
Refer to the code snippet:

What is the value of array after the code executes?

A. 1, 2, 3, 5
B. 1, 2, 3, 4, 5, 4, 4
C. 1, 2, 3, 4, 5, 4
D. 1, 2, 3, 4, 4, 5, 4

Answer: A

NEW QUESTION # 69
Refer to the code below:

What is the output if this function when called with an empty array?

A. Return 10
B. Return NaN
C. Retruns 0
D. Throws an error

Answer: A

NEW QUESTION # 70
Given the following code:

What is the output of line 02?

A. ''null''
B. ''object''
C. ''x''
D. ''Undefined''

Answer: B

NEW QUESTION # 71
Which two code snippets showworking examples of a recursivefunction?
Choose 2 answers

A. Let countingDown = function(startNumber) {If ( startNumber >0) {console.log(startNumber) ;return countingDown(startNUmber);} else {return startNumber;}};
B. Const sumToTen = numVar => {If (numVar < 0)Return;return sumToTen(numVar + 1)};
C. Function factorial ( numVar ) {If (numVar < 0) return;If ( numVar ===0 ) return 1;return numVar -1;
D. Const factorial =numVar => {If (numVar < 0) return;If ( numVar === 0 ) return 1;returnnumVar * factorial ( numVar - 1 );};

Answer: A,D

NEW QUESTION # 72
......

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