JSFiddle - React, Tailwind, and code Playground

by brigand

JavaScript

function arrayLength(array) {
	let max = -1;
  for (const key of Object.keys(array)) {
  	if (key.length && key % 1 === 0) {
   		max = Math.max(max, Number(key) 
    }
  }
  
  return max + 1;
}