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Web Development Articles
Page 229 of 801
Remove item from a nested array by indices in JavaScript
Suppose we have a nested array of objects like this: const arr = [ { value: 'some value' }, { array: [ { value: 'some value' }, { array: [ ...
Read MoreCombining two arrays in JavaScript
In JavaScript, combining two arrays means pairing corresponding elements from each array to create a new array of subarrays. This is commonly known as "zipping" arrays together. For example, if we have two arrays of the same length, we can combine their elements at matching indices to form pairs. If the two arrays are: const arr1 = ['a', 'b', 'c']; const arr2 = [1, 2, 3]; Then the expected output should be: [ ['a', 1], ['b', 2], ['c', 3] ] ...
Read MoreJavaScript: create an array of JSON objects from linking two arrays
Suppose, we have two arrays like these − const meals = ["breakfast", "lunch", "dinner"]; const ingredients = [ ["eggs", "yogurt", "toast"], ["falafel", "mushrooms", "fries"], ["pasta", "cheese"] ]; We are required to write a JavaScript function that takes in two such arrays and maps the subarrays in the second array to the corresponding strings of the first array. Therefore, the output for the above arrays should look like − { "breakfast" : ["eggs", "yogurt", "toast"], ...
Read MoreRemove the duplicate value from array with images data in JavaScript
When working with arrays of objects containing image data, you often need to remove duplicates based on a specific property. Here's how to remove duplicate objects based on the 'image' property value. Sample Data Consider an array of image objects where some images appear multiple times: const arr = [{ 'image': "jv2bcutaxrms4i_img.png", 'gallery_image': true }, { 'image': "abs.png", 'gallery_image': true }, { 'image': "acd.png", 'gallery_image': false }, { ...
Read MoreFilter JavaScript array of objects with another array
Suppose, we have an array of objects like this − const arr = [ {area: 'NY', name: 'Bla', ads: true}, {area: 'DF', name: 'SFS', ads: false}, {area: 'TT', name: 'SDSD', ads: true}, {area: 'SD', name: 'Engine', ads: false}, {area: 'NSK', name: 'Toyota', ads: false}, ]; We are required to write a JavaScript function that takes in one such array as the first argument and an array of string literals as the second argument. Our function should then filter the input ...
Read MoreCombine array of objects in JavaScript
Suppose, we have an array of objects that contains data about some students like this: const arr = [{ name: 'A', idNo: 1, marks: { math: 98, sci: 97, eng: 89 } }, { name: 'B', idNo: 2, marks: { ...
Read MoreRemove all occurrences of a multiple occurring element in an array in JavaScript
We are required to write a JavaScript function that takes in an array of literal values. The array might contain some repeating values. Our function should remove all the values from the array that are repeating. We are required to remove all instances of all such elements. Problem Understanding When an element appears multiple times in an array, we want to remove ALL occurrences of that element, not just the duplicates. For example, if 2 appears twice, we remove both instances. Using filter() with indexOf() and lastIndexOf() The most efficient approach uses filter() to keep only ...
Read MoreString to binary in JavaScript
Converting strings to binary representation is a common task in JavaScript programming. This involves converting each character to its ASCII code and then to binary format. For example, if we have: const str = 'Hello World'; The binary output should be: 1001000 1100101 1101100 1101100 1101111 100000 1010111 1101111 1110010 1101100 1100100 How It Works The conversion process involves three steps: Split the string into individual characters Get the ASCII code of each character using charCodeAt() ...
Read MoreImplementing Heap Sort using vanilla JavaScript
Heap Sort is a comparison-based sorting algorithm that can be thought of as an improved selection sort. Like selection sort, it divides input into sorted and unsorted regions, but uses a binary heap data structure to efficiently find the maximum (or minimum) element. How Heap Sort Works Heap Sort works in two main phases: Build Max Heap: Convert the array into a max heap where parent nodes are larger than their children Extract Elements: Repeatedly remove the maximum element (root) and restore the heap property Implementation Here's a complete implementation of Heap Sort ...
Read MorePrefix calculator using stack in JavaScript
A Reverse Polish Notation (RPN) calculator processes operators after their operands, using a stack data structure. This implementation evaluates mathematical expressions efficiently without parentheses. How RPN Works In RPN, operators follow their operands. For example, "3 4 +" means "3 + 4". The algorithm uses a stack: Push operands onto the stack When encountering an operator, pop two operands, perform the operation, and push the result back The final stack contains the result Step-by-Step Process Consider the input array: const arr = [1, 5, '+', 6, 3, '-', '/', 7, '*']; ...
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