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 −
Live Demo
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
Published on 20-Apr-2021 09:34:55
