JSFiddle - React, Tailwind, and code Playground

by dmitri_pavlutin

JavaScript

const names = ['Batman', , 'Bane'];

console.log(names[0]); // logs 'Batman'
console.log(names[1]); // logs undefined
console.log(names[2]); // logs 'Bane'

console.log(isDense(names)); // logs false

function isDense(array) {
  for (let index = 0; index < array.length; index++) {
    if (!(index in array)) {
      return false;
    }
  }
  return true;
}