Practice Test JavaScript-Developer-I Fee - Cert JavaScript-Developer-I Exam

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q39-Q44):

NEW QUESTION # 39
Given the following code:

is the output of line 02?

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

Answer: B

NEW QUESTION # 40
let sampleText = " The quick brown fox jumps " ;
Which three expressions return true for a substring?

A. sampleText.includes( ' fox ' );
B. sampleText.indexOf( ' Quick ' ) !== -1;
C. sampleText.indexOf( ' fox ' ) !== -1;
D. sampleText.indexOf( ' quick ' ) > -1;
E. sampleText.include( ' fox ' ) !== -1;

Answer: A,C,D

Explanation:
The correct answers are A, B, and C .
The original variable name appears to contain a typing error. The variable should be used consistently as sampleText:
let sampleText = " The quick brown fox jumps " ;
A is correct because includes() checks whether a string contains a specific substring and returns a Boolean value:
sampleText.includes( ' fox ' );
Since " fox " exists inside " The quick brown fox jumps " , this returns:
true
B is correct after correcting the typing error. The correct expression is:
sampleText.indexOf( ' quick ' ) > -1;
indexOf() returns the index position where the substring is found. If the substring is not found, it returns -1.
Since " quick " exists in the string, sampleText.indexOf( ' quick ' ) returns a value greater than -1, so the expression returns:
true
C is correct after correcting the missing quotation marks and adding a Boolean comparison:
sampleText.indexOf( ' fox ' ) !== -1;
The substring " fox " exists in the string, so indexOf( ' fox ' ) does not return -1. Therefore, the expression returns:
true
D is incorrect because the method name is typed incorrectly. JavaScript string has includes(), not include().
Incorrect:
sampleText.include( ' fox ' )
Correct:
sampleText.includes( ' fox ' )
E is incorrect because JavaScript string matching is case-sensitive:
sampleText.indexOf( ' Quick ' ) !== -1;
The string contains " quick " with a lowercase q, not " Quick " with an uppercase Q, so this returns:
false
Therefore, the verified answers are A, B, and C .

NEW QUESTION # 41
A developer is creating a simple webpage with a button. When a user clicks this button
for the first time, a message is displayed.
The developer wrote the JavaScript code below, but something is missing. The
message gets displayed every time a user clicks the button, instead of just the first time.
01 function listen(event) {
02 alert ( 'Hey! I am John Doe') ;
03 button.addEventListener ('click', listen);
Which two code lines make this code work as required?
Choose 2 answers

A. On line 06, add an option called once to button.addEventListener().
B. On line 02, use event.first to test if it is the first execution.
C. On line 04, use event.stopPropagation ( ),
D. On line 04, use button.removeEventListener(' click" , listen);

Answer: A,D

NEW QUESTION # 42
A developer has two ways to write a function:

After deciding on an option, the developer creates 1000 monster objects.
How many growl methods are created with Option A and Option B?

A. 1 growl method is created regardless of which option is used.
B. 1 growl method is created for Option A. 1000 growl methods are created for Option B.
C. 1000 growl methods are created for Option A. 1 growl method is created for Option B.
D. 1000 growl methods are created regardless of which option is used.

Answer: C

NEW QUESTION # 43
Which three browser specific APIs are available for developer to persist data between page loads?
Choose 3 answers

A. localStorage
B. indexedDB
C. global variables
D. cookies
E. IIFEs

Answer: A,B,E

NEW QUESTION # 44
......

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