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Object Oriented Programming Articles
Page 16 of 589
Check if a value exists in an array and get the next value JavaScript
We are required to write a JavaScript function that takes in an array of literals as the first argument and a search string as the second argument. The function should search the array for that search string. If that string exists in the array, we should return its next element from the array, otherwise we should return false. Example const arr = ["", "comp", "myval", "view", "1"]; const getNext = (value, arr) => { const a = [undefined].concat(arr); const p = a.indexOf(value) + 1; ...
Read MoreComplicated array grouping JavaScript
Suppose we have an array of objects like this − const arr = [ {userId: "3t5bsFB4PJmA3oTnm", from: 1, to: 6}, {userId: "3t5bsFB4PJmA3oTnm", from: 7, to: 15}, {userId: "3t5bsFB4PJmA3oTnm", from: 172, to: 181}, {userId: "3t5bsFB4PJmA3oTnm", from: 182, to: 190} ]; We need to write a JavaScript function that groups consecutive objects based on their "from" and "to" properties. Objects are considered consecutive when the "to" value of one object plus 1 equals the "from" value of the next object with the ...
Read MoreDetermine whether there is a pair of values in the array where the average of the pair equals to the target average in JavaScript
We are required to write a JavaScript function that takes in an array of sorted integers and a target average as first and second arguments. The function should determine whether there is a pair of values in the array where the average of the pair equals to the target average. There's a solution with O(1) additional space complexity and O(n) time complexity. Since an array is sorted, it makes sense to have two indices: one going from begin to end (say y), another from end to begin of an array (say x). Algorithm Approach The two-pointer ...
Read MoreFind the minimum and maximum values that can be calculated by summing exactly four of the five integers in JavaScript
Given an array of five positive integers, we are required to find the minimum and maximum values that can be calculated by summing exactly four of the five integers. Then print the respective minimum and maximum values as a single line of two space-separated long integers. The array is not sorted all the times. For example: const arr = [1, 3, 5, 7, 9] The minimum sum is: 1 + 3 + 5 + 7 = 16 and the maximum sum is: 3 + 5 + 7 ...
Read MoreHow to get the most common values in array: JavaScript ?
We are required to write a JavaScript function that takes in an array of literals that have repeating values. Our function should return an array of the most common element(s) in the array (if two or more elements appear for the same number of most times then the array should contain all those elements). Example The code for this will be − const arr1 = ["a", "c", "a", "b", "d", "e", "f"]; const arr2 = ["a", "c", "a", "c", "d", "e", "f"]; const getMostCommon = arr => { const count = ...
Read MoreGrouping array nested value while comparing 2 objects - JavaScript
When working with complex nested objects, you often need to compare and group data from different states. This article demonstrates how to group array nested values while comparing two objects in JavaScript. Problem Statement Suppose we have a JSON object containing "before" and "after" states of device data: const input = { "before": { "device": [ { "id": "1234", "price": "10", ...
Read MoreSort array of objects by string property value - JavaScript
Sorting an array of objects by a string property is a common task in JavaScript. The most efficient approach uses the built-in sort() method with localeCompare() for proper alphabetical ordering. Sample Data Let's work with this array of person objects: const people = [ { first_name: 'Lazslo', last_name: 'Jamf' }, { first_name: 'Pig', last_name: 'Bodine' }, { first_name: 'Pirate', last_name: 'Prentice' } ]; console.log("Original array:", people); Original array: [ { first_name: 'Lazslo', last_name: 'Jamf' }, { ...
Read MoreComplete Equation by Filling Missing Operator in JavaScript
We are required to write a JavaScript function that takes in a bunch of numbers and returns the correct sequence of operations to satisfy the equation. The operators that can be used are (+, −, *, /, ^, %). For example − Input : 5 3 8 Output : 5+3=8 Input : 9 27 3 Output : 9=27/3 Input : 5 2 25 , 1 5 2 Output : 5^2=25 , 1=5%2 For each input, there is at ...
Read MoreSort an array to have specific items first in the array - JavaScript
When working with arrays of objects, you might need to sort them so that items with specific properties appear first. This is a common requirement in applications where you need to prioritize certain elements while maintaining the original order of others. Suppose we have an array of objects like this: const arr = [ {flag: true, other: 1}, {flag: true, other: 2}, {flag: false, other: 3}, {flag: true, other: 4}, {flag: true, other: 5}, ...
Read MoreHow to find a nearest higher number from a specific set of numbers: JavaScript ?
We have a set of numbers and our requirement is to find the same or the nearest higher number key to a specific number provided as the input to the function. The set of numbers is defined as: const numbers = { A: 107, B: 112, C: 117, D: 127, E: 132, F: 140, G: 117, H: 127, I: 132, J: 132, K: 140, ...
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