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JavaScript-Developer-I Practice Questions

Question # 1

Given the following code:

What will be the first four numbers logged?

A.

0012

B.

0112

C.

0122

D.

0123



B.

0112



Question # 2

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:

A.

console.assert( arr.length === 5 );

B.

arr.forEach(elem => console.assert(elem === 0)) ;

C.

console.assert(arr[0] === 0 && arr[ arr.length] === 0);

D.

console.assert (arr.length >0);



A.

console.assert( arr.length === 5 );


B.

arr.forEach(elem => console.assert(elem === 0)) ;



Question # 3

Refer to the code below:
Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];
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?

A.

1 2 3

 

B.

1 3 2

C.

2 1 3

D.

2 3 1



D.

2 3 1



Question # 4

A 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 turnaround 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?

A.

NODE_DEBUG=true node server.js

B.

DEBUG=http, https node server.js

C.

NODE_DEBUG=http,https node server.js

D.

DEBUG=true node server.js



D.

DEBUG=true node server.js



Question # 5

Refer to the following code:
Let sampleText = ‘The quick brown fox jumps’;
A developer needs to determine if a certain substring is part of a string.
Which three expressions return true for the given substring ?
Choose 3 answers

A.

sampleText.includes(‘fox’);

B.

sampleText.includes(‘ quick ’, 4);

C.

sampleText.includes(‘ Fox ’, 3)

D.

sampleText.includes(‘ fox ’);

E.

sampleText.includes(‘ quick ’) !== -1;



B.

sampleText.includes(‘ quick ’, 4);


D.

sampleText.includes(‘ fox ’);


E.

sampleText.includes(‘ quick ’) !== -1;



Question # 6

Refer to code below:
Const objBook = {
Title: ‘Javascript’,
};
Object.preventExtensions(objBook);
Const newObjBook = objBook;
newObjectBook.author = ‘Robert’;
What are the values of objBook and newObjBook respectively ?


A.

[title: “javaScript”] [title: “javaScript”]

B.

{author: “Robert”, title: “javaScript}
Undefined

C.

{author: “Robert”, title: “javaScript}
{author: “Robert”, title: “javaScript}

D.

{author: “Robert”}
{author: “Robert”, title: “javaScript}



A.

[title: “javaScript”] [title: “javaScript”]



Question # 7

Which three statements are true about promises ?
Choose 3 answers

A.

The executor of a new Promise runs automatically.

B.

A Promise has a .then() method.

C.

A fulfilled or rejected promise will not change states .

D.

A settled promise can become resolved.

E.

A pending promise can become fulfilled, settled, or rejected.



B.

A Promise has a .then() method.


C.

A fulfilled or rejected promise will not change states .


E.

A pending promise can become fulfilled, settled, or rejected.



Question # 8

A developer has two ways to write a function:
Option A:
function Monster() {
This.growl = () => {
Console.log (“Grr!”);
}
}
Option B:
function Monster() {};
Monster.prototype.growl =() => {
console.log(“Grr!”);
}
After deciding on an option, the developer creates 1000 monster objects.
How many growl methods are created with Option A Option B?

A.

1 growl method is created for Option A. 1000 growl methods are created for Option B.

B.

1000 growl method is created for Option A. 1 growl methods are created for Option B.

C.

1000 growl methods are created regardless of which option is used.

D.

1 growl method is created regardless of which option is used.



B.

1000 growl method is created for Option A. 1 growl methods are created for Option B.



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