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
Object Oriented Programming Articles
Page 46 of 589
Subtracting array in JavaScript Delete all those elements from the first array that are also included in the second array
Subtracting arrays in JavaScript involves removing all elements from the first array that exist in the second array. This operation is useful for filtering data and finding differences between datasets. Problem Statement Given two arrays, we need to delete all elements from the first array that are also present in the second array. const arr1 = ['uno', 'dos', 'tres', 'cuatro']; const arr2 = ['dos', 'cuatro']; // Expected output: ['uno', 'tres'] Using filter() with indexOf() The filter() method creates a new array with elements that pass a test. We use indexOf() to check ...
Read MoreJavaScript: compare array element properties, and if identical, combine
When working with arrays of objects, you often need to combine objects that have identical properties. In this example, we'll consolidate storage devices with the same size by adding up their counts. Suppose we have an array of objects containing information about data storage devices: const drives = [ {size:"900GB", count:3}, {size:"900GB", count:100}, {size:"1200GB", count:5}, {size:"900GB", count:1} ]; console.log("Original array:", drives); Original array: [ { size: '900GB', count: 3 }, { size: '900GB', count: ...
Read MoreImplementing Math function and return m^n in JavaScript
We are required to write a JavaScript function that takes in two numbers say m and n. Then function should calculate and return m^n. For example − For m = 4, n = 3, then power(4, 3) = 4^3 = 4 * 4 * 4 = 64 power(6, 3) = 216 Using Built-in Math.pow() Method JavaScript provides the built-in Math.pow() method for calculating powers: console.log(Math.pow(4, 3)); // 4^3 console.log(Math.pow(6, 3)); // 6^3 console.log(Math.pow(2, -2)); // 2^(-2) = 1/4 64 216 0.25 Custom Implementation Using Recursion ...
Read MoreFinding the sub array that has maximum sum JavaScript
We are required to write a JavaScript function that takes in an array of numbers. The array can contain both positive and negative numbers. The purpose of our function is to find the subarray (of any length) whose elements when summed give the maximum sum. This problem is known as the Maximum Subarray Problem and is commonly solved using Kadane's Algorithm. For example, if the input array is: const arr = [-2, 1, -3, 4, -1, 2, 1, -5, 4]; Then the output should be: 6 Because the subarray [4, ...
Read MoreDifference between two strings JavaScript
We are given two strings, say s and t. String t is generated by random shuffling string s and then add one more letter at a random position. We are required to write a JavaScript function that takes both these strings and returns the letter that was added to t. For example − If the input strings are − const s = "abcd", t = "abcde"; Then the output should be − const output = "e"; because 'e' is the letter that was added. Method 1: Using XOR ...
Read MoreChecking for overlapping times JavaScript
Time interval overlap detection is a common programming challenge. We need to determine if any two time intervals in an array share common time periods. Problem Definition Given an array of time intervals with start and end times, we need to check if any two intervals overlap. Two intervals overlap when they have some time in common. const arr = [ { start: '01:00', end: '04:00' }, { start: '05:00', end: '08:00' }, { start: '07:00', end: '11:00' }, { start: '09:30', end: '18:00' ...
Read MoreSorting an array of objects by an array JavaScript
In JavaScript, you can sort an array of objects based on the order defined by another array. This is useful when you need to prioritize objects according to a specific sequence. Problem Statement Given an array of objects and a reference array, we need to sort the objects according to the order specified in the reference array. const orders = [ { status: "pending"}, { status: "received" }, { status: "sent" }, { status: "pending" } ]; const statuses = ...
Read MoreGet range of months from array based on another array JavaScript
Suppose we have two arrays of strings. The first array contains exactly 12 strings, one for each month of the year like this: const year = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec']; console.log(year); [ 'jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec' ] The second array contains exactly two strings, denoting a range of months like this: const monthsRange = ["aug", "oct"]; console.log(monthsRange); [ 'aug', 'oct' ] We need to ...
Read MoreFinding the index position of an array inside an array JavaScript
When working with arrays of arrays in JavaScript, you might need to find the index position of a specific sub-array within the main array. This is useful for checking if a particular array exists and determining its location. Suppose we have an array of arrays like this: const arr = [ [1, 0], [0, 1], [0, 0] ]; We need to write a JavaScript function that takes an array of arrays as the first argument and a target array as the second argument. The function should ...
Read MoreGrade book challenge JavaScript
We are required to write a function that finds the mean of the three scores passed to it and returns the letter value associated with that grade according to the following table. Grade Scale Score Range Grade 90-100 A 80-89 B ...
Read More