Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles on Trending Technologies
Technical articles with clear explanations and examples
Compare arrays using Array.prototype.every() in JavaScript
We are required to write a JavaScript function that takes in two arrays of literals. Then our function should return true if all the elements of first array are included in the second array, irrespective of their count, false otherwise. We have to use Array.prototype.every() method to make these comparisons. Syntax array.every(callback(element, index, array), thisArg) How Array.every() Works The every() { const areEqual = arr1.every(el => { return arr2.includes(el); }); return areEqual; }; ...
Read MoreSum of all prime numbers in JavaScript
In JavaScript, calculating the sum of all prime numbers up to a given limit is a common programming challenge. This involves identifying prime numbers and adding them together efficiently. Understanding Prime Numbers A prime number is a positive integer greater than 1 that has no positive divisors other than 1 and itself. For example, if we want to find the sum of all prime numbers up to 10, we identify: 2, 3, 5, 7. Their sum is 2 + 3 + 5 + 7 = 17. ...
Read MoreConverting whitespace string to url in JavaScript
In web URLs, browsers automatically replace spaces with '%20' for proper encoding. JavaScript provides multiple methods to convert whitespace characters to URL-encoded format. We need to write a function that takes a string and replaces all whitespace characters with '%20'. For example, if the input string is: const str = 'some extra Space'; Then the output should be: const output = 'some%20extra%20%20Space'; Using Manual Loop Method This approach iterates through each character and manually replaces spaces: const str = 'some extra Space'; const replaceWhitespace = (str = ...
Read MoreReturning reverse array of integers using JavaScript
In JavaScript, creating an array of integers in reverse order (from a number down to 1) is a common programming task. This article explores multiple approaches to generate descending arrays efficiently, from basic loops to built-in array methods. Problem Statement Create a JavaScript function that generates an array of natural numbers starting from a given number and descending down to 1. Sample Input: const num = 5; Sample Output: const output = [5, 4, 3, 2, 1]; Method 1: Using For Loop The most straightforward approach uses a decrementing for ...
Read MoreCalculating value of a sequence based on some input using JavaScript
Problem We need to write a JavaScript function that takes a number n as input and calculates the value of a sequence term un. Given a sequence where: u1 = 0 and u2 = 2 Our function should find the value of un for which the following recurrence relation holds: 6unun+1 - 5unun+2 + un+1un+2 = 0 Understanding the Sequence From the recurrence relation, we can derive that this sequence follows the pattern un = 2n-1 for n ≥ 2, and u1 = 0. Example Implementation Here's the ...
Read Morecrypto.createHash() Method in Node.js
The crypto.createHash() method creates a hash object that can generate hash digests using cryptographic algorithms like SHA-256, MD5, or SHA-512. It's commonly used for password hashing, data integrity verification, and digital signatures. Syntax crypto.createHash(algorithm, [options]) Parameters algorithm – The hashing algorithm to use (string). Common values: 'sha256', 'md5', 'sha512', 'sha1' options – Optional parameters for controlling stream behavior and output length for certain algorithms Return Value Returns a Hash object that can be used to generate hash digests by chaining update() and digest() methods. Example 1: Basic Hash Generation ...
Read MoreHow to add styling or css to your app using reactnative?
React Native provides two main approaches for styling your components: using the StyleSheet component and inline styles. Both methods allow you to apply CSS-like properties to create visually appealing mobile applications. Using StyleSheet Component The StyleSheet component is the recommended approach for styling in React Native. It provides better performance and code organization compared to inline styles. Import StyleSheet First, import the StyleSheet component from React Native: import { StyleSheet } from 'react-native'; Creating Styles Create your styles using StyleSheet.create() method: const styles = StyleSheet.create({ container: { ...
Read MoreHow to set the width of a selection area border on a canvas using FabricJS?
In this article, we are going to learn how to set the width of a selection area border on a canvas using FabricJS. A selection area indicates the area selected using the mouse and all objects under that area will get selected. FabricJS allows us to adjust the width of the selection area border with the selectionLineWidth property. Syntax new fabric.Canvas(element: HTMLElement|String, { selectionLineWidth: Number }: Object) Parameters element − This parameter is the element itself which can be derived using document.getElementById() ...
Read MoreHow to compile a Typescript file?
In this article we are going to explore TypeScript and how to compile and execute TypeScript files. TypeScript is an open-source programming language developed and maintained by Microsoft. TypeScript is syntactically similar to JavaScript but adds additional features like static typing and object-oriented programming. Unlike JavaScript, TypeScript does not run directly in web browsers and must be compiled to JavaScript first. TypeScript files need to be transpiled to JavaScript before they can be executed. This compilation process converts TypeScript syntax into standard JavaScript that browsers and Node.js can understand. Prerequisites Before compiling TypeScript files, you need ...
Read MoreHow to set the padding of a Rectangle using FabricJS?
In this tutorial, we are going to learn how to set the padding 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. Just as we can specify the position, colour, opacity and dimension of a rectangle object in the canvas, we can also set the padding of a rectangle object. This can be done by using the padding property. Syntax new fabric.Rect({ padding : Number }: Object) ...
Read More