Free Salesforce JS-Dev-101 Exam Questions

Become Salesforce Certified with updated JS-Dev-101 exam questions and correct answers

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Total 217 Questions | Updated On: Aug 03, 2026

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Question 1

Refer to the code below:Which value can a developer expect when referencing country,capital,cityString?

A : 'London'

B : undefined

C : An error

D : 'NaN'

Answer: D

Question 2

Refer to the code below:Function changeValue(obj) {Obj.value = obj.value/2;}Const objA = (value: 10);Const objB = objA;changeValue(objB);Const result = objA.value;What is the value of result after the code executes?

A : 10

B : Nan

C : 5

D : Undefined

Answer: C

Question 3

The developer has a function that prints ''Hello'' to an input name. To test this, thedeveloper created a function that returns ''World''. However the following snippet does not print '' Hello World''. Capture What can the developer do to change the code to print ''Hello World'' ?

A : Change line 7 to ) () ;

B : Change line 2 to console.log('Hello' , name() );

C : Change line 9 to sayHello(world) ();

D : Change line 5 to function world ( ) {

Answer: B

Question 4

Which three actions can be using the JavaScript browser console?Choose 3 answers:

A : View and change DOM the page.

B : Display a report showing the performance of a page.

C : Run code that is not related to page.

D : view , change, and debug the JavaScript code of the page.

E : View and change security cookies.

Answer: A,C,D

Question 5

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 the serverWill 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); }};

D : try{ws.connect (( ) => {console.log('connected to client'); });} catch(error) { console.log('ERROR' , error); };}

Answer: C

Page: 1 / 44

Total 217 Questions | Updated On: Aug 03, 2026

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