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Pseudo class is to show different state of an element or a css selector. visited pseudo class is to show that the link is already visited.This pseudo class is mostly being associated with link.Syntaxa:visited { color:green;}Let's check the actual usage of :visited pseudo class with different scenarios, as follows -Example Live Demo           a:visited { color:green;}        Click here to learn ExplanationWhen you first time see the link it will be shown with normal link color (Blue) and the link will turn green if this link has been visited once.Example Live Demo ... Read More

Pseudo class is to show different state of an element or a css selector. Active pseudo class is to show that the element is in active state.This pseudo class is mostly being associated with link and button or any other element which can be active.For example if it is associated with link that the link is active.Syntaxa:active { color:green;}Let's check the actual usage of :active pseudo class with different scenarios, as follows −Example Live Demo           a:active { color:green;}        Click here to learn ExplanationWhen you first time see the link ... Read More

Fibonacci numbers are the numbers such that every number in the series after the first two is the sum of the two preceding ones. The series starts with 1, 1. Example −1, 1, 2, 3, 5, 8, 13, 21, 34, ….We can write a program to generate nth as follows −functionfibNaive(n) {    if (n

Dynamic programming breaks down the problem into smaller and yet smaller possible sub-problems. These sub-problems are not solved independently. Rather, results of these smaller sub-problems are remembered and used for similar or overlapping sub-problems. Dynamic programming is used where we have problems, which can be divided into similar sub-problems so that their results can be re-used. Mostly, these algorithms are used for optimization. Before solving the in-hand sub-problem, the dynamic algorithm will try to examine the results of the previously solved sub-problems. The solutions of sub-problems are combined in order to achieve the best solution. For a problem to be ... Read More

Array is a linear data structure, which is able to store elements of different datatypes. Arrays are also defined as ordered collections. In array each of the value will be referred to as an element and those can be identified with index numbers. const array_name = [item1, item2, ...]; const movies = [Bahubali, RRR, KGF, Pushpa]; //Index values of above elements Bahubali – [0] RRR – [1] KGF – [2] Pushpa – [3] Loops is a programming element, there will be a sequence of instructions defined in the loop and it will continue to iterate till ... Read More

Basically, multi-dimension arrays are used if you want to put arrays inside an array. Let's take an example. Say you wanted to store every 6 hour's temperature for every weekday. You could do something like:let monday = [35, 28, 29, 31]; let tuesday = [33, 24, 25, 29]; //...This is a good place to use a multidimensional array instead. A multidimensional array is nothing but an array of arrays. If we take forward our example, each row will represent a day while each entry in the row will represent a temp entry. For example, let temps = [    [35, ... Read More

Removing an element from an array in Javascript can be achieved using various approaches. Removal of an element can be done from the begining, end or from any specific position. We will be understanding various approaches for removing element from an array in Javascript based on our need. In this article, we are having an array of numbers and our task is to remove an element from an array in Javascript. Approaches to Remove Element from Javascript Array Here is a list of approaches for removing an element from an array in Javascript which we will be discussing in ... Read More

Functions which have been commented out in this code. You can switch to those as well. We've also moved the Queue, Stack, and PriorityQueue classes in different modules that can be imported using either import statements or using require calls. Here is the complete implementation of the Graph class − Exampleconst Queue = require("./Queue"); const Stack = require("./Stack"); const PriorityQueue = require("./PriorityQueue"); class Graph {    constructor() {       this.edges = {};       this.nodes = [];    }    addNode(node) {       this.nodes.push(node);       this.edges[node] = [];    }   ... Read More

Kruskal's algorithm is a greedy algorithm that works as follows −1. It Creates a set of all edges in the graph.2. While the above set is not empty and not all vertices are covered, It removes the minimum weight edge from this setIt checks if this edge is forming a cycle or just connecting 2 trees. If it forms a cycle, we discard this edge, else we add it to our tree.3. When the above processing is complete, we have a minimum spanning tree.In order to implement this algorithm, we need 2 more data structures.First, we need a priority queue ... Read More

Prim's algorithm is a greedy algorithm that finds a minimum spanning tree for a weighted undirected graph. It finds a subset of the edges that forms a tree that includes every vertex, where the total weight of all the edges in the tree is minimized.The algorithm operates by building this tree one vertex at a time, from an arbitrary starting vertex, at each step adding the cheapest possible connection from the tree to another vertex.How does Prim's algorithm work?Let us look at an illustration of how Prim's algorithm works −1. Choose any arbitrary node as the root node: In this ... Read More