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JavaScript-Developer-I Practice Questions

Question # 1
Which statement accurately describes an aspect of promises?
A. Arguments for the callback function passed to .then() are optional.
B. In a .then() function, returning results is not necessary since callbacks will catch the result of a previous promise.
C. .then() cannot be added after a catch.
D. .then() manipulates and returns the original promise.


A. Arguments for the callback function passed to .then() are optional.



Question # 2

Refer to the code below

Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?

A.

10

B.

11

C.

12

D.

13



B.

11




Question # 3

Which statement parses successfully?

A.

JSON. parse (""foo"');

B.

JSON.parse (""foo'");

C.

JSON.parse ("foo");

D.

JSON.parse ("foo");



A.

JSON. parse (""foo"');




Question # 4

Refer to the following code:
Let obj ={
Foo: 1,
Bar: 2
}
Let output =[],
for(let something in obj{
output.push(something);
}
console.log(output);
What is the output line 11?

A.

[1,2]

B.

[“bar”,”foo”]

C.

[“foo”,”bar”]

D.

[“foo:1”,”bar:2”]



C.

[“foo”,”bar”]




Question # 5

A developer creates a simple webpage with an input field. When a user enters text in
the input field and clicks the button, the actual value of the field must be displayed in the
console.
Here is the HTML file content:
<input type =” text” value=”Hello” name =”input”>
<button type =”button” >Display </button>
The developer wrote the javascript code below:
Const button = document.querySelector(‘button’);
button.addEvenListener(‘click’, () => (
Const input = document.querySelector(‘input’);
console.log(input.getAttribute(‘value’));
When the user clicks the button, the output is always “Hello”.
What needs to be done make this code work as expected?

A.

Replace line 04 with console.log(input .value);

B.

Replace line 03 with const input = document.getElementByName(‘input’);

C.

Replace line 02 with button.addEventListener(“onclick”, function() {

D.

Replace line 02 with button.addCallback(“click”, function() {



A.

Replace line 04 with console.log(input .value);




Question # 6

A class was written to represent items for purchase in an online store, and a second class
Representing items that are on sale at a discounted price. THe constructor sets the name
to the
first value passed in. The pseudocode is below:
Class Item {
constructor(name, price) {
… // Constructor Implementation
}
}
Class SaleItem extends Item {
constructor (name, price, discount) {
...//Constructor Implementation
}
}
There is a new requirement for a developer to implement a description method that will
return a
brief description for Item and SaleItem.
Let regItem =new Item(‘Scarf’, 55);
Let saleItem = new SaleItem(‘Shirt’ 80, -1);
Item.prototype.description = function () { return ‘This is a ’ + this.name;
console.log(regItem.description());
console.log(saleItem.description());
SaleItem.prototype.description = function () { return ‘This is a discounted ’ +
this.name; }
console.log(regItem.description());
console.log(saleItem.description());
What is the output when executing the code above ?

A.

This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is aScarf
This is a discounted Shirt

B.

This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt

C.

This is a Scarf
This is a Shirt
This is a discounted Scarf
This is a discounted Shirt

D.

This is aScarf
Uncaught TypeError: saleItem.description is not a function
This is a Shirt
This is a did counted Shirt



B.

This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt




Question # 7

myArraym can have one level, two levels, or more levels. Which statement flattens myArray when it can be arbitrarily nested?

A.

myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);

B.

myArray. join (","). split (",");

C.

[ ] .concat {. . .myArray) ;

D.

myArray.flat(Infinity);



A.

myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);




Question # 8

Given the requirement to refactor the code above to JavaScript class format, which class
definition is correct?

A. Option A
B. Option B
C. Option C
D. Option D


A. Option A



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