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Symmetric Tree in JavaScript

Symmetric Tree in JavaScript

Given the root of a binary tree, check whether it is a mirror of itself (i.e., symmetric around its center).
Palindrome Linked List in JavaScript

Palindrome Linked List in JavaScript

Given the head of a singly linked list, return true if it is a palindrome.
Move Zeroes in JavaScript

Move Zeroes in JavaScript

Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements. Note that you must do this in-place without making a copy of the array.
Decode Ways In JavaScript

Decode Ways In JavaScript

A message containing letters from A-Z can be encoded into numbers using the mapping. To decode an encoded message, all the digits must be grouped then mapped back into letters using the reverse of the mapping above (there may be multiple ways).
Number of Islands in JavaScript

Number of Islands in JavaScript

Given an m x n 2D binary grid, grid which represents a map of '1's (land) and '0's (water), return the number of islands.
Introduction to stack data structure in JavaScript

Introduction to stack data structure in JavaScript

A stack is an abstract data type that stores an ordered collection of items which follow first in last out (FILO) or last in first out (LIFO) principle; with two principal operations: push, which adds an item to the stack, and pop, which removes the most recently added item.
Dijkstra's Shortest Path Algorithm

Dijkstra's Shortest Path Algorithm

Dijkstra's algorithm is an algorithm for finding the shortest paths between nodes in a graph, which may represent, for example, road networks. It was conceived by computer scientist Edsger W. Dijkstra in 1956 and published three years later. The algorithm exists in many variants.
Autocomplete / Suggestion / Typeahead Search using Trie Data Structure and Algorithm

Autocomplete / Suggestion / Typeahead Search using Trie Data Structure and Algorithm

Autocomplete or suggestion or typeahead offers a number of possible values while typing. I am going to solve this problem using trie data structure and algorithm.
PurpleGather iOS & Android Mobile App

PurpleGather iOS & Android Mobile App

E-commerce mobile app runs on iOS and Android devices that allows users to browse, search, get product details, read and write reviews, purchase products, create support tickets, and manage orders. It is available to download in Apple App Store and Google Play Store.
Introduction to Web Worker API

Introduction to Web Worker API

Web Worker API is a JavaScript web API for running multiple tasks simultaneously without affecting the performance of the apps.
Introduction to Web Beacon API

Introduction to Web Beacon API

The Beacon API is a JavaScript web API for sending data from the browser to the web server without expecting to get a response. It is used to send analytics, diagnostics, and logging data which doesn't need a response.
Unique Path III in JavaScript

Unique Path III in JavaScript

On a 2-dimensional grid, there are 4 types of squares. Return the number of 4-directional walks from the starting square to the ending square, that walk over every non-obstacle square exactly once.
Largest Rectangle in Histogram in JavaScript

Largest Rectangle in Histogram in JavaScript

Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram.
How to calculate Euclidean Distance? How to measure the distance between two points?

How to calculate Euclidean Distance? How to measure the distance between two points?

Calculate the Euclidean Distance for one dimensional, two dimensional, three dimensional in JavaScript. In mathematics, the Euclidean distance or Euclidean metric is the "ordinary" straight-line distance between two points in Euclidean space.
Verifying an Alien Dictionary in JavaScript

Verifying an Alien Dictionary in JavaScript

In an alien language, surprisingly they also use english lowercase letters, but possibly in a different order. The order of the alphabet is some permutation of lowercase letters.