Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Finding array number that have no matching positive or negative number in the array using JavaScript
Problem
We are required to write a JavaScript function that takes in an array of integers. For each number in the array there will also be its negative or positive compliment present in the array, but for exactly one number, there will be no compliment.
Our function should find and return that number from the array.
Example
Following is the code −
const arr = [1, -1, 2, -2, 3];
const findOddNumber = (arr = []) => {
let count = 0;
let number = arr.reduce((total, num) => {
if (num >= 0)
count++
else
count--
return total + num;
}, 0)
return number / Math.abs(count);
};
console.log(findOddNumber(arr));Output
3
Updated on: 20-Apr-2021
105 Views
Advertisements