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Dutch national flag problem in Javascript

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Dutch national flag problem and solution in Javascript Problem statement:   The Dutch national flag (DNF) problem is one of the most popular programming problems proposed by Edsger Dijkstra. The flag of the Netherlands consists of three colors: white, red, and blue. The task is to randomly arrange balls of white, red, and blue such that balls of the same color are placed together. Now, let's consider an array with 3 distinct values say 0, 1 and 2. We won't be using any sort method and we need to sort this array in 0(n). Input Array :  let   arr  = [ 0 ,  2 ,  1 ,  0 ,  1 ,  2 ,  0 ,  2 ]; Expected Output: [ 0, 0, 0, 1, 1, 2, 2, 2 ] Solution Approach : When we see expected output, we can clearly see that sorted array is divided into 3 sections having values 0 , 1 and 2. So, let's divide the array in 3 sections: a) from 0th index to left boundary b) from left boundary to right boundary c) from right boundary to last index. Now we...
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Create Telegram Bot using Nodejs in 10 minutes

Have you ever thought of creating a telegram bot for sending some useful information, news, alerts, images or even reminders, but didn't know where to start from. Well, in this tutorial we will create a Telegram BOT and will send a chat message from the BOT to user, and NodeJS will be used for the coding part. The best part is i will share the exact simple steps that you need to perform and it won't take more than 10 mins to setup your first telegram bot and to send first message to the user from the NodeJS code. Step 1: Create your first Telegram Bot Telegram has a bot to create the bots, just search the BotFather  and then follow the instructions to create a BOT. Use the /newbot command to create a new bot. The BotFather will ask you for a name and username, then generate an authorization token for your new bot. The name of your bot is displayed in contact details and elsewhere. The Username is a short name, to be used in mentions and t.me links. The token is a string along t...
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Developing Amazon price checker in Javascript

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  Amazon price checker in Javascript using Nightmare Disclaimer: This post is for educational purposes only. We do not encourage or promote any sort of web scraping. Objective: Have you ever thought of checking the price of your favorite product on any e-commerce site using your code. In this post we are going to achieve that. We will check the price of our selected product on amazon with the  help of Nightmare module. Refer the link for more details on Nightmare module :  https://www.npmjs.com/package/nightmare Solution Design:  let's proceed with our very first step, i.e to shortlist the product and get the Amazon URL. For this project we have selected the " OnePlus  8 " with the URL : https://www.amazon.in/Test-Exclusive-547/dp/B078BNQ318/  Step 2 : We will get the element for the price of the product from the amazon URL. For this open the developer tools in the browser and inspect the price element. For reference, check the below screenshot. Step 3 : We...
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