MigratoryBirdObservation problem from HackerRank

migratoryBirdObvervation.js

function migratoryBirds(arr=[1,2,3,4,5,4,3,2,1,3,4]) {
let typesOccurs = {};
arr.forEach(item=>{
    if(typesOccurs[item]){
        typesOccurs[item]=Number(typesOccurs[item])+1
        }else{
            typesOccurs[item]=1
        }
});
console.log(typesOccurs);
let maxes = Object.values(typesOccurs);
maxes = Math.max(...maxes);
console.log(maxes);
let maxEntries = Object.keys(typesOccurs).filter(key=>typesOccurs[key]===maxes);
return Math.min(...maxEntries);
}
migratoryBirds();