Hottest Salesforce JavaScript-Developer-I Certification & JavaScript-Developer-I Latest Dumps Questions

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Variables, Types, and Collections	23%	- Type coercion and conversion - Truthy and falsy evaluations - Primitive and complex data types - Arrays and collections - Variable declarations and initialization - JSON parsing and manipulation - Strings, numbers, and dates
Debugging and Error Handling	7%	- Error handling techniques (try/catch/finally) - Custom error types - Console methods for debugging - Breakpoints and code inspection
Objects, Functions, and Classes	25%	- Prototypal inheritance - Arrow functions - ES6 classes and inheritance - Modules and decorators - Higher-order functions - Object creation and manipulation - Execution flow and context - Function declarations and expressions - Variable scope and closures
Browser and Events	17%	- Browser Developer Tools usage - Event handling and listeners - Event propagation (bubbling and capturing) - Browser-specific APIs - DOM manipulation - Interacting with forms and user input
Asynchronous Programming	13%	- Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Event loop and execution flow - Async/Await syntax - Callbacks
Server Side JavaScript	8%	- CLI commands - Package management (npm) - Node.js fundamentals - Server-side JavaScript implementations - Core Node.js modules
Testing	7%	- Unit testing concepts - Test effectiveness evaluation - Test coverage and reliability - Writing and modifying unit tests

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

NEW QUESTION # 67
In which situation should a developer include a try... catch block around their function call?

A. The function contains scheduled code.
B. The function has an error that should not be silenced.
C. The function might raise a runtime error that needs to be handled.
D. The function results in an out of memory issue.

Answer: C

NEW QUESTION # 68
Refer to the code:

Given the code above, which three properties are set pet1?
Choose 3 answers:

A. Name
B. Owner
C. Type
D. Size
E. canTalk

Answer: C,D,E

NEW QUESTION # 69
A developer wants to create a simple image upload in the browser using the File API. The HTML is below:

The JavaScript portion is:

In lines 04 and 08, which code allows the user to select an image from their local computer, and to display the image in the browser?

A. 04 const reader = new File ( ) ;
08 if (file) ,reader, readerAsDataURL (file) ;
B. 04 const reader = new File ( ) ;
08 if (file) URL , createObjectURL (file) ;
C. 04 const reader = new FileReader ( ) ;
08 if (file) reader , createAsDataURL (file) ;
D. 04 const reader = new FileReader ( ) ;
08 if (file) URL , createObjectURL (file) ;

Answer: B

NEW QUESTION # 70
Refer to the code below:

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

A. Return 0
B. Return NaN
C. Return 5
D. Return Infinity

Answer: C

NEW QUESTION # 71
function myFunction() {
a = a + b;
var b = 1;
}
myFunction();
console.log(a);
console.log(b);
Which statement is correct?

A. Line 02 throws a reference error, therefore line 03 is never executed.
B. Both line 02 and 03 are executed, but the values printed are undefined.
C. Both line 02 and 03 are executed, and the variables are hoisted.
D. Line 08 outputs the variable, but line 09 throws an error.

Answer: A

Explanation:
The correct answer is A , not D.
Inside myFunction(), the declaration:
var b = 1;
is hoisted to the top of the function scope, but only the declaration is hoisted, not the assignment. So internally, JavaScript treats the function approximately like this:
function myFunction() {
var b;
a = a + b;
b = 1;
}
Now examine this line:
a = a + b;
Before JavaScript can assign a value to a, it must first evaluate the right-hand side:
a + b
At this point:
b
exists locally because var b was hoisted, so its value is:
undefined
However:
a
has not been declared anywhere. Reading an undeclared variable causes a:
ReferenceError
So this line throws an error before assignment happens:
a = a + b;
Because the error occurs on that line, the next line inside the function is never executed:
var b = 1;
Also, because the error is not handled with try...catch, the program stops before reaching:
console.log(a);
console.log(b);
Therefore, the accurate statement is:
Line 02 throws a reference error, therefore line 03 is never executed.
So the verified answer is A .

NEW QUESTION # 72
......

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