JSFiddle - React, Tailwind, and code Playground

JavaScript

console.log("1. avg of an array of numbers");
 var avgNumbers = function (arr) {
     var total = 0;
     for (var i = 0; i < arr.length; i++) {
         total += arr[i];
     }
     return total / arr.length;
 }

 console.log('avg number = ', avgNumbers([1, 2, 3, 4, 5]));