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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 2	Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
Topic 3	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 4	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.

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Updated Salesforce JS-Dev-101 Exam Questions And Answer

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q131-Q136):

NEW QUESTION # 131
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..

What is the output when executing the code above

A. 0
B. 50Uncaught TypeError: saleItem,desrcription is not a function5080
C. 1
D. 5080Uncaught ReferenceError:this,discount is undefined72

Answer: C

NEW QUESTION # 132
A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named msg is declared and assigned a value on line 03.
function getAvailabilityMessage(item) {
if (getAvailability(item)) {
var msg = "Username available";
return msg;
}
}

A. "Username available"
B. undefined
C. "msg is not defined"
D. "newUserName"

Answer: A

Explanation:
The correct answer is C.
When getAvailability(item) returns true, the code inside the if block executes:
var msg = "Username available";
return msg;
The variable msg receives the string value:
"Username available"
Then that same value is returned from the function.
The key point is that var is function-scoped, not block-scoped. So msg belongs to the function scope of getAvailabilityMessage(). However, because the return msg; statement is inside the same if block, the function immediately returns the assigned string when the username is available.
Option A is incorrect because msg is defined before it is returned.
Option B is incorrect because "newUserName" is not assigned or returned anywhere in the function.
Option D would only happen if getAvailability(item) returned false, because then the function would finish without an explicit return value.
For the available username scenario, the verified answer is C.

NEW QUESTION # 133
At Universal Containers, every team has its own way of copyingJavaScript objects. The code snippet shows an Implementation from one team:

What is the output of the code execution?

A. Hello John Doe
B. Hello Dan Doe
C. SyntaxError: Unexpected token in JSON
D. Hello Dan

Answer: C

NEW QUESTION # 134
A developer has an isDeg function that takes one argument, pts. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?

A. setTimeout(isDeg('cat'), 60000);
B. setInterval(isDeg('cat'), 60000);
C. setInterval(isDeg, 60000, 'cat');
D. setTimeout(isDeg, 60000, 'cat');

Answer: C

Explanation:
setInterval(fn, delay, arg1, arg2, ...) calls fn every delay ms, passing extra arguments.
To call isDeg every 60 seconds with "cat":
setInterval(isDeg, 60000, 'cat');
Why others are wrong:
A/D: isDeg('cat') is called immediately, and its return value is scheduled, not the function.
C: setTimeout runs once after 60 seconds, not repeatedly.

NEW QUESTION # 135
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
* Will establish a web socket connection and handle receipt of messages to theserver
* Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?

A. ws.connect (( ) => {console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};
B. ws.on ('connect', ( ) => {console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' ,error); });}); C. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
C. try{ws.connect (( ) => {console.log('connected to client'); });} catch(error) { console.log('ERROR' ,error); };}

Answer: C

NEW QUESTION # 136
......

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