JSFiddle - React, Tailwind, and code Playground

by Yurii Predborskyi

JavaScript

let nums =  [1, 2, 3];
let mid = 3;
let leftSum = nums.reduce((sum, item, index) => index <= mid ? sum + item : sum);
let rightSum = nums.reduceRight((sum, item, index) => index >= mid ? sum + item : sum);
document.write(leftSum);
document.write('<br>');
document.write(rightSum);