Salesforce JavaScript-Developer-I Premium Exam Engine pdf – Download Free Updated 180 Questions [Q85-Q100]

NEW QUESTION 85
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 server
* Will be imported with require, and made available with a variable called ws.
The developer also wants to add error logging if a connection fails.
Given this information, which code segment show the correct way to set up a client two events that listen at execution time?
A)

B)

C)

D)

NEW QUESTION 86
A developer wants to create an object from a function in the browser using the code below.
What happens due to lack of the new keyword on line 02?

NEW QUESTION 87
developer has a web server running with Node.js. The command to start the web
server is node server,js. The web server started having latency issues. Instead of a one second
turn around for web requests, the developer now sees a five second turnaround,
Which command can the web developer run to see what the module is doing during the
latency period?

NEW QUESTION 88
Refer to code below:
Function muFunction(reassign){
Let x = 1;
var y = 1;
if( reassign ) {
Let x= 2;
Var y = 2;
console.log(x);
console.log(y);}
console.log(x);
console.log(y);}
What is displayed when myFunction(true) is called?

NEW QUESTION 89
Given the following code:

What will be the first four numbers logged?

NEW QUESTION 90
Given the code below:

Which method can be provide a visual representation of the list if users and to allow sorting by the name or email attributes.

NEW QUESTION 91
A test has a dependency on database.query. During the test the dependency is replaced
with an object called database with the method, query, that returns an array. The
developer needs to verify how many times the method was called and the arguments
used each time.
Which two test approaches describe the requirement?
Choose 2 answers

NEW QUESTION 92
Which three actions can be done using the JavaSript browser console?
Choose 3 answer

NEW QUESTION 93
Given code below:
setTimeout (() => (
console.log(1);
). 0);
console.log(2);
New Promise ((resolve, reject )) = > (
setTimeout(() => (
reject(console.log(3));
). 1000);
)).catch(() => (
console.log(4);
));
console.log(5);
What is logged to the console?

NEW QUESTION 94
Refer to the code snippet:

A developer writes this code 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.
What is the return of msg when getivelibilityMessage (” bewUserName’) is executed and getAvailability (”newUserName”) returns false?

NEW QUESTION 95
Which statement accurately describes the behaviour of the async/ await keyworks ?

NEW QUESTION 96
A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current day. The code line below is responsible for this calculation.
Const deliveryDate = new Date ();
Due to changes in the business requirements, the delivery date must now be today’s date + 9 days.
Which code meets this new requirement?

NEW QUESTION 97
The developer wants to test the array shown:
const arr = Array(5).fill(0)
Which two tests are the most accurate for this array ?
Choose 2 answers:

NEW QUESTION 98
Refer to the following object.

How can a developer access the fullName property for dog?

NEW QUESTION 99
A developer needs to test this functions:

Which two assert statements are valid tests for this function?

NEW QUESTION 100
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.

When the code execution stops at the breakpoint on line 06, which two types of information are available In the browser console? Choose 2 answers