Skip to main content

javascript snippets interview questions set 3

 


For the previous set please refer to javascript snippets questions set 2.

Let's  begin with set 3,

Q12)After the following code, what is the value of a.length?

var a = ['dog', 'cat', 'hen'];

a[100] = 'fox';

a) 101

b) 3

c) 4

d) 100

Q13)What is the value of dessert.type after executing this code?

const dessert = { type: 'pie' };

dessert.type = 'pudding';

a) pie

b) The code will throw an error.

c) pudding

d) undefined

Q14)Why would you include a "use strict" statement in a JavaScript file?

a) to tell parsers to interpret your JavaScript syntax loosely

b) to tell parsers to enforce all JavaScript syntax rules when processing your code

c) to instruct the browser to automatically fix any errors it finds in the code

d) to enable ES6 features in your code


Q15)Which variable is an implicit parameter for every function in JavaScript?
a) Arguments
b) args
c) argsArray
d) argumentsList

I hope you like the article. Please stay connected for more such articles.

Please check the comment section for answers and if any doubts let me know there. 


You can also follow me on Twitter or Linkedin for the latest updates.

Written By:

Saurabh Joshi

Comments

Post a Comment

Popular posts from this blog

Node.js: Extract text from image using Tesseract.

In this article, we will see how to extract text from images using Tesseract . So let's start with this use-case, Suppose you have 300 screenshot images in your mobile which has an email attribute that you need for some reason like growing your network or for email marketing. To get an email from all these images manually into CSV or excel will take a lot of time. So now we will check how to automate this thing. First, you need to install Tesseract OCR( An optical character recognition engine ) pre-built binary package for a particular OS. I have tested it for Windows 10. For Windows 10, you can install  it from here. For other OS you make check  this link. So once you install Tesseract from windows setup, you also need to set path variable probably, 'C:\Program Files\Tesseract-OCR' to access it from any location. Then you need to install textract library from npm. To read the path of these 300 images we can select all images and can rename it to som...
1 comment
Read more

Globant part 1

 1)call,apply,bind example? Ans: a. call Method: The call method is used to call a function with a given this value and arguments provided individually. Javascript code: function greet(name) {   console.log(`Hello, ${name}! I am ${this.role}.`); } const person = {   role: 'developer' }; greet.call(person, 'Alice'); // Output: Hello, Alice! I am developer. In this example, call invokes the greet function with person as the this value and passes 'Alice' as an argument. b. apply Method: The apply method is similar to call, but it accepts arguments as an array. Javascript code: function introduce(language1, language2) {   console.log(`I can code in ${language1} and ${language2}. I am ${this.name}.`); } const coder = {   name: 'Bob' }; introduce.apply(coder, ['JavaScript', 'Python']); // Output: I can code in JavaScript and Python. I am Bob. Here, apply is used to invoke introduce with coder as this and an array ['JavaScript', 'Pyt...
Post a Comment
Read more

Globlant part 2

 1)JWT token:           const jwt = require ( 'jsonwebtoken' ); A JWT token consists of three parts separated by dots ( . ): Header : Contains metadata about the type of token and the hashing algorithm used. Payload (Claims) : Contains the claims or statements about the subject of the token, such as user ID, roles, etc. Signature : Verifies that the sender of the JWT is who it says it is and ensures that the message wasn't changed along the way. It is header +payload +secret key. Methods: const newToken = jwt. sign (payload, secretKey, { expiresIn : '1h' }); Use verify() when you need to ensure the token's integrity and authenticity. Use decode() when you only need to extract information from the token and don't need to verify its signature. 2)Window ,this,global: In nodejs this and global refers to same global methods and varibales just that no dom related things that are in window. In nodejs no window. 3)a.getSum(); // Define the custom method getSu...
Post a Comment
Read more