Question 1

Refer to the code below:let o = {get js() {let city1 = String('st. Louis');let city2 = String(' New York');return {firstCity: city1.toLowerCase(),secondCity: city2.toLowerCase(),}}}What value can a developer expect when referencing o.js.secondCity?

Options :

A : Undefined

B : ' new york '

C : ' New York '

D : An error

Answer: B

Question 2

A developer receives a comment from the Tech Lead that the code given below haserror:const monthName = 'July';const year = 2019;if(year === 2019) {monthName = 'June';}Which line edit should be made to make this code run?

Options :

A : 01 let monthName ='July';

B : 02 let year =2019;

C : 02 const year = 2020;

D : 03 if (year == 2019) {

Answer: A

Question 3

Given the code below:const delay = sync delay => {Return new Promise((resolve, reject) => {setTimeout (resolve, delay);});};const callDelay =async () =>{const yup =await delay(1000);console.log(1);What is logged to the console?

Options :

A : 1 2 3

B : 1 3 2

C : 2 1 3

D : 2 3 1

Answer: D

Question 4

Refer to HTML below:The current status of an Order: In Progress Which JavaScript statement changes the text 'In Progress' to 'Completed' ?

Options :

A : document.getElementById(''status'').Value = 'Completed' ;

B : document.getElementById(''#status'')[removed] = 'Completed' ;

C : document.getElementById(''status'')[removed] = 'Completed' ;

D : document.getElementById(''.status'')[removed] = 'Completed' ;

Answer: C

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?

Options :

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

Confidently Practice Online with Free JS-Dev-101 Exam Cram

Buying Options: