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
Web Development Articles
Page 312 of 801
isSubset of two arrays in JavaScript
In JavaScript, checking if one array is a subset of another means verifying that all elements of the second array exist in the first array. This is a common programming problem that can be solved efficiently using JavaScript's Set data structure. Understanding the Problem An array is considered a subset of another array if all its elements are present in the parent array. For example, [2, 4, 6] is a subset of [1, 2, 3, 4, 5, 6] because all elements (2, 4, 6) exist in the larger array. Using Set for Efficient Lookup The most ...
Read MoreJavaScript Total subarrays with Sum K
In this problem, we need to find the total number of continuous subarrays within an array that have a sum equal to a given value K using JavaScript. Understanding the Problem Given an array of integers and a target sum K, we need to count all possible subarrays whose elements sum up to K. A subarray is a contiguous sequence of elements within an array. For example, if we have array [1, 2, 3, 4, 5] and K = 6, the subarrays with sum 6 are [1, 2, 3] and [2, 4], giving us a count of 2. ...
Read MoreLargest difference between element with a twist in JavaScript
In this problem, we need to find the largest difference between elements with a twist using JavaScript. The twist is that we can only calculate the difference between an element and any smaller element that appeared before it in the array. Understanding the Problem Unlike finding the simple maximum difference between any two elements, this problem requires us to: Maintain the original array order (no sorting) Only consider differences where the larger element comes after the smaller one Find the maximum possible difference under these constraints ...
Read MoreMaximum sum of n consecutive elements of array in JavaScript
In JavaScript, finding the maximum sum of n consecutive elements in an array is a classic sliding window problem. This technique efficiently calculates the maximum sum by maintaining a window of fixed size and sliding it across the array. Understanding the Problem The goal is to find a continuous subarray of length n within the given array that has the highest possible sum. For example, given array [1, 2, 4, 7, 3, 5] and n = 3, the consecutive elements [4, 7, 3] have the maximum sum ...
Read MoreNon-negative set subtraction in JavaScript
In JavaScript, non-negative set subtraction involves removing elements from one set that exist in another set, while ensuring the result contains only non-negative values. This operation combines set theory with value filtering using JavaScript's built-in Set object and forEach method. What is the Set Object? The Set is a built-in data structure introduced in ES6 that stores unique values of any type. Unlike arrays, Sets automatically eliminate duplicates and maintain insertion order. Key characteristics include: Uniqueness: Only unique elements are stored ...
Read MorePair whose sum exists in the array in JavaScript
In this article we will see how to find pairs of items in an array whose sum equals another element present in the same array. We'll use JavaScript to implement an efficient algorithm for this problem. Understanding the Problem The problem is to find pairs of numbers (a, b) in an array where a + b = c, and c is also present in the array. For example, in array [1, 2, 3, 4, 5], the pair (1, 2) has sum 3, which exists in the array. Approach Using Hash Set We'll use a Set data ...
Read MoreParse and balance angle brackets problem in JavaScript
In JavaScript, determining whether angle brackets in a string are properly balanced is a common problem when working with HTML, XML, or template parsing. This problem requires checking that every opening angle bracket '' in the correct order. What is a Stack-based Approach? The stack-based approach uses a Last In, First Out (LIFO) data structure to track opening brackets. When we encounter an opening bracket, we push it onto the stack. When we find a closing bracket, we check if there's a matching opening bracket at the top of the stack and pop it if found. Think ...
Read MorePartial sum in array of arrays JavaScript
In the given problem statement our task is to get the partial sum in an array of arrays with the help of JavaScript functionalities. The partial sum at position (i, j) represents the sum of all elements from the top-left corner (0, 0) to the current position (i, j). Understanding the Problem An array of arrays (2D array) is a data structure where each element is itself an array. For example: [ [1, 2, 3], [4, 5, 6], [7, 8, 9] ] The partial ...
Read MorePick out numbers from a string in JavaScript
In JavaScript, extracting numbers from strings is a common task that can be efficiently accomplished using regular expressions and built-in string methods. This approach allows you to find and extract numeric values from mixed content. Understanding the Problem The goal is to extract all numeric values from a given string. For example, from the string "I am 25 years old and earn $1500.50", we want to extract [25, 1500.50]. This involves pattern matching to identify numeric sequences including integers and decimal numbers. Using Regular Expressions with match() ...
Read MoreRemove duplicate items from an array with a custom function in JavaScript
In JavaScript, arrays often contain duplicate values that need to be removed. This article demonstrates how to create a custom function to eliminate duplicates and return an array with unique elements only. Understanding the Problem We need to create a function that accepts an array as input and returns a new array containing only unique items, excluding any duplicates. For example, given the array [0, 0, 2, 2, 3, 3], the function should return [0, 2, 3]. Algorithm Overview The algorithm iterates through the input array and adds items to a result array only if they ...
Read More