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What is a Word Square? A word square consists of a set of words written out in a square grid, such that the same words can be read both horizontally and vertically. This means the character at position (i, j) must equal the character at position (j, i). For instance, one valid word square is: H E A R T E M B E R A B U S E R E S I N T R E N D We need to write a JavaScript function that takes an array of words and ... Read More
We need to write a JavaScript function that calculates the sum of all integers at even indices (0, 2, 4, etc.) in an array, then multiplies this sum by the last element of the array. Problem Statement Given an array of integers, find the sum of elements at even indices and multiply by the last element. Input: [4, 1, 6, 8, 3, 9] Even indices: 0, 2, 4 → elements: 4, 6, 3 Sum: 4 + 6 + 3 = 13 Last element: 9 Result: 13 × 9 = 117 Solution const ... Read More
Problem We are required to write a JavaScript function that takes in a string. Our function should return the length of the longest contiguous substring that contains only vowels. Approach The solution uses a sliding window approach to track consecutive vowels. We maintain two variables: cur for the current vowel sequence length and max for the longest sequence found so far. Example Following is the code − const str = 'schooeal'; const findLongestVowel = (str = '') => { let cur = 0; let max ... Read More
The crypto.createDiffieHellmanGroup() method creates a predefined Diffie-Hellman group using well-known parameters. This is an alias for crypto.getDiffieHellman() and provides a secure way to establish shared secrets between parties. Syntax crypto.createDiffieHellmanGroup(name) Parameters name − A string specifying the predefined group name (e.g., 'modp1', 'modp2', 'modp5', 'modp14', 'modp15', 'modp16', 'modp17', 'modp18'). Return Value Returns a DiffieHellman object that can generate keys and compute shared secrets. Example 1: Basic Usage with modp1 Create a file with name − diffieHellmanGroup.js and copy the below code snippet. After creating ... Read More
ProgressBar is a way to tell users that the content will be available in sometime. It can best be used when you submit something to the server and wait for the server to respond. To work with the progress bar component install react-native-paper module using npm. The command to install react-native-paper is − npm install --save-dev react-native-paper Basic Syntax The basic component of progress bar is as follows− To work with Progress Bar you need to import it from react-native-paper as follows − import { ProgressBar} ... Read More
In this tutorial, we are going to learn how to set the width of stroke of a Rectangle using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a rectangle, we will have to create an instance of fabric.Rect class and add it to the canvas. The strokeWidth property allows us to specify the width of a stroke for an object in pixels. Syntax new fabric.Rect({ strokeWidth: Number }); Parameters ... Read More
Flux is a JavaScript application architecture pattern developed by Facebook for building scalable web applications. Originally designed for React applications, Flux provides a unidirectional data flow pattern that makes application state more predictable and easier to debug. The Flux architecture consists of four main components that work together to manage data flow in a predictable way. Core Flux Components Flux architecture is built around four key components that ensure unidirectional data flow: Actions − Plain JavaScript objects that describe what happened in the application Dispatcher − Central ... Read More
To validate a TutorialsPoint URL using JavaScript, you can use regular expressions to check if the URL matches the expected domain pattern and extract specific parts of the URL. Regular Expression Pattern The regex pattern /^https?:\/\/(tutorialspoint\.com)\/(.*)$/ breaks down as follows: ^ - Start of string https? - Matches "http" or "https" :\/\/ - Matches "://" (tutorialspoint\.com) - Captures the domain (escaped dot) \/ - Matches forward slash (.*)$ - Captures everything after the domain until end of string Example function validateTutorialspointURL(myURL) { var regularExpression = /^https?:\/\/(tutorialspoint\.com)\/(.*)$/; ... Read More
Suppose, we have an array of objects like this − const arr = [{ name : 'Client 1', total: 900, value: 12000 }, { name : 'Client 2', total: 10, value: 800 }, { name : 'Client 3', total: 5, value : 0 }]; We are required to write a JavaScript function that takes in one such array and extracts a separate array for each object property. Therefore, ... Read More
In JavaScript, converting numbers to characters is commonly done using ASCII/Unicode values. JavaScript provides the built-in String.fromCharCode() method to convert numeric values to their corresponding characters. The String.fromCharCode() Method The String.fromCharCode() method converts Unicode values to characters. Each number represents a specific character in the ASCII/Unicode table. Syntax String.fromCharCode(num1, num2, ..., numN) Example: Single Number to Character const n = 65; const c = String.fromCharCode(n); console.log(c); console.log("Number 72 becomes:", String.fromCharCode(72)); console.log("Number 101 becomes:", String.fromCharCode(101)); A Number 72 becomes: H Number 101 becomes: e In this ... Read More