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Articles by AmitDiwan
Page 410 of 840
Middle of three elements - JavaScript
We are required to write a JavaScript function that takes in three unsorted numbers and returns the middlemost of them using minimum number of comparisons. For example: If the numbers are − 34, 45, 12 Then our function should return the following − 34 Algorithm Explanation The algorithm uses mathematical differences to determine the middle element without explicit sorting. By calculating differences between pairs and checking their signs, we can identify the middle value efficiently. Example Following is the code − const num1 = 34; const ...
Read MoreHow to read data from JSON array using JavaScript?
JSON arrays are a common data structure in JavaScript applications. This article demonstrates various methods to read and access data from JSON arrays. What is a JSON Array? A JSON array is a collection of JSON objects enclosed in square brackets. Each object can contain multiple key-value pairs. [ {"name": "Rohan", "age": 22}, {"name": "Shawn", "age": 12}, {"name": "Michael", "age": 21} ] Method 1: Using JSON.parse() and forEach() The most common approach is parsing the JSON string and iterating through the array: ...
Read MoreWhat should be the correct Algorithm to Get Array B from Array A counting backwards from the last element in JavaScript?
Consider the following binary array (Array A) − const arr = [1, 0, 1, 1, 1, 1, 0, 1, 1]; When this array is passed through the function, say sumRight(), it produces the following output array (Array B) − const output = [1, 0, 4, 3, 2, 1, 0, 2, 1]; Understanding the Algorithm Elements in array arr can be either 0 or 1. The function counts backward from the last element of array arr, if there are consecutive 1's in the array arr then the corresponding element in the output ...
Read MoreWildcard matching of string JavaScript
We are required to write a JavaScript function that accepts two strings and a number n. The function matches the two strings i.e., it checks if the two strings contains the same characters. The function should return true if both the strings contain the same character irrespective of their order or if they contain at most n different characters, otherwise the function should return false. Let's write the code for this function — Example const str1 = 'first string'; const str2 = 'second string'; const wildcardMatching = (first, second, num) => { ...
Read MoreHow to remove the first character of link (anchor text) in JavaScript?
In JavaScript, you can remove the first character from link anchor text using the substring(1) method combined with DOM manipulation. This is useful when you need to programmatically fix incorrectly formatted link text. The Problem Sometimes links may have extra characters at the beginning that need to be removed. For example, "Aabout_us" should be "about_us" and "Hhome_page" should be "home_page". Using substring(1) Method The substring(1) method extracts characters from index 1 to the end, effectively removing the first character (index 0). ...
Read MoreMaximum Possible Sum of Products in JavaScript
We are given two arrays say, arr1 and arr2 of positive numbers. The number of values in both the arrays are the same. We are required to write a function that finds the maximum sum of products of their elements. Each element in arr1 has to be multiplied with exactly one element in arr2 and vice versa such that each element of both the arrays appears exactly once and the sum of product produced is maximum. Problem Understanding For example: if, arr1 = [5, 1, 3, 4, 2] and, arr2 = [8, 10, 9, 7, ...
Read MoreHow to add form validation for empty input fields with JavaScript?
Form validation ensures users provide required information before submitting. JavaScript allows client-side validation to check for empty input fields and provide immediate feedback. Basic Empty Field Validation Here's a complete example that validates empty input fields: Form Validation Example JavaScript Empty Input Field Validation Name: ...
Read MoreCheck if three consecutive elements in an array is identical in JavaScript
We are required to write a JavaScript function, say checkThree() that takes in an array and returns true if anywhere in the array there exists three consecutive elements that are identical (i.e., have the same value) otherwise it returns false. Therefore, let's write the code for this function − Example const arr = ["g", "z", "z", "v" ,"b", "b", "b"]; const checkThree = arr => { const prev = { element: null, count: 0 ...
Read MoreSeparate odd and even in JavaScript
In JavaScript, separating odd and even numbers means rearranging an array so that all even numbers appear before all odd numbers. This is commonly achieved using custom sorting functions or array methods like filter(). Using Custom Sort Function The most efficient approach uses Array.sort() with a custom comparator that prioritizes even numbers: const arr = [2, 6, 3, 7, 8, 3, 5, 4, 3, 6, 87, 23, 2, 23, 67, 4]; const isEven = num => num % 2 === 0; const sorter = (a, b) => { if(isEven(a) && !isEven(b)){ ...
Read MoreCreate increment decrement plus minus buttons programmatically for HTML input type number in JavaScript
In JavaScript, you can create increment and decrement buttons for HTML input type number using the stepUp() and stepDown() methods. This approach provides better user experience by allowing precise control over numeric inputs. On clicking Increment (+), the number in the input field increases by the step value On clicking Decrement (-), the number in the input field decreases by the step value The buttons respect the min/max constraints of the input field Basic Implementation Here's how to create increment/decrement buttons programmatically: ...
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