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
Complete Graph Class in Javascript
This article presents a comprehensive Graph class implementation in JavaScript with various graph algorithms including traversal, shortest path, and minimum spanning tree algorithms. Graph Class Structure The Graph class uses an adjacency list representation with two main properties: nodes - Array storing all graph vertices edges - Object mapping each node to its connected neighbors with weights Basic Graph Operations const Queue = require("./Queue"); const Stack = require("./Stack"); const PriorityQueue = require("./PriorityQueue"); class Graph { constructor() { this.edges = {}; ...
Read MoreJavaScript function to accept a string and mirrors its alphabet
We need to write a function that accepts a string and mirrors its alphabet. This means each letter is replaced with its counterpart from the opposite end of the alphabet. If the input is 'abcd' The output should be 'zyxw' The function maps every character to the letter that is (26 - N) positions away from it, where N is the 1-based index of that alphabet (like 5 for 'e' and 10 for 'j'). How It Works We use the String.prototype.replace() method to match all English alphabets regardless of case. For each letter: ...
Read MoreRemove elements from array in JavaScript using includes() and splice()?
The includes() method checks whether an array contains a specific element, while splice() is used to add or remove items from an array. Together, they can be used to remove multiple elements from an array efficiently. Syntax array.includes(searchElement) array.splice(start, deleteCount) How It Works The approach involves iterating through the array and using includes() to check if each element should be removed. When a match is found, splice() removes it, and the index is decremented to account for the array shift. Example deleteElementsFromArray = function(elements, ...values) { let elementRemoved ...
Read MoreRotating an array - JavaScript
In JavaScript, rotating an array means moving elements from one position to another by a specified number of steps. This operation is useful for circular data structures and algorithmic problems. For example, if we have an array [12, 6, 43, 5, 7, 2, 5] and rotate it by 3 positions to the left, the result would be [5, 7, 2, 5, 12, 6, 43]. Method 1: Using Array Prototype Extension We can extend the Array prototype to add a rotation method: // Helper function to rotate by one position const rotateByOne = arr => { ...
Read MoreFinding the length of a JavaScript object
JavaScript objects don't have a built-in length property like arrays. However, there are several methods to find the number of properties in an object. Suppose we have an object like this: const obj = { name: "Ramesh", age: 34, occupation: "HR Manager", address: "Tilak Nagar, New Delhi", experience: 13 }; We need to count the number of properties in this object. Using Object.keys() (Recommended) The most common and reliable method is Object.keys(), which returns an array of the object's property names: ...
Read MoreHow to get the difference between two arrays in JavaScript?
To get the difference between two arrays in JavaScript, you can find elements that exist in one array but not in both. This is commonly called the symmetric difference. There are several approaches to achieve this. Using filter() and includes() (Recommended) Array Difference function arrayDifference(arr1, arr2) { // Elements in ...
Read MoreWhat are the three types of errors I can expect in my JavaScript script?
In this tutorial, let us discuss the three types of errors we can expect in our JavaScript code. Errors are statements that block the execution of the program. During the compilation and execution of JavaScript programs, three types of errors can occur: syntax errors, runtime errors, and logical errors. Syntax Errors Syntax errors are the most common errors that occur when the JavaScript engine cannot understand the code due to incorrect syntax. These errors happen during the parsing phase before code execution begins. For example, using a semicolon instead of a colon in an object declaration ...
Read MoreHow to define a measurement in screen pixels with CSS?
To define a measurement in screen pixels with CSS, use the px unit. The pixel (px) is an absolute unit that represents a single dot on the screen and provides precise control over element sizing and positioning. Syntax property: value px; Example: Using Pixels for Positioning and Sizing .pixel-example { position: relative; left: 90px; ...
Read MoreHow to check whether a number is finite or not in JavaScript?
In JavaScript, the isFinite() method checks whether a value is a finite number. It returns true for finite numbers and false for infinite values, NaN, or non-numeric values. Syntax isFinite(value) Parameters: value - The value to be tested for finiteness Return Value: Returns true if the value is finite, false otherwise. Example 1: Basic Usage Here's a function that demonstrates basic usage of isFinite(): Check Finite Numbers Checking division results: ...
Read MoreHow to remove a class name from an element with JavaScript?
To remove a class name from an element with JavaScript, you can use the classList.remove() method. This method provides a clean and efficient way to manipulate CSS classes dynamically. Syntax element.classList.remove('className'); Example .newStyle { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; width: 100%; padding: 25px; background-color: rgb(147, 80, 255); color: white; ...
Read More