JSFiddle - React, Tailwind, and code Playground

by jiggle

JavaScript

var array = [{"title":"Ender's Game","genre":"Science Fiction","year":2008},{"title":"Harry Potter and the Goblet of Fire","genre":"fantasy","year":2002},{"title":"Pride and Predjudice","genre":"romance","year":1980}]
function getLongest(array){
  return array.map((obj) => obj.genre.length).sort((a, b)=>{
         return (b - a); //sorting in descending order
 })[0]; //first element will hold the longest genre
}
console.log(getLongest(array));