What's incorrect about the findPopularDino() method in Park.js?

dinosaur.js

const Dinosaur = function (species, diet, guestsAttractedPerDay) {
  this.species = species;
  this.diet = diet;
  this.guestsAttractedPerDay = guestsAttractedPerDay;
}

module.exports = Dinosaur;

park.js

const Dinosaur = require('./dinosaur');

const Park = function (name, ticketPrice, dinosaurCollection){
this.name = name;
this.ticketPrice = ticketPrice;
this.dinosaurCollection = dinosaurCollection;
}

Park.prototype.addDinoaour = function(dinosaur){
    this.dinosaurCollection.push(dinosaur);
}

Park.prototype.removeDinosaur = function(indexnumber){
    this.dinosaurCollection.splice(indexnumber,1);
}

Park.prototype.findMostPopular = function(){
    let mostPopularDino;
    let array = [];

    for(let i = 0; this.dinosaurCollection.length; i++){
        array.push(this.dinosaurCollection[i].guestsAttractedPerDay);
    }
   let indexOfMostPopularDino = array.indexOf(Math.max(...array))

    mostPopularDino = this.dinosaurCollection[indexOfMostPopularDino]

    return mostPopularDino;
}



module.exports = Park;

park_spec.js

const assert = require('assert');
const Park = require('../models/park.js');
const Dinosaur = require('../models/dinosaur.js');

describe('Park', function() {

  let dino1;
  let dino2;
  let dino3;

  dino1 = new Dinosaur('t-rex', 'carnivore', 50);
  dino2 = new Dinosaur('triseratops', 'herbivore', 50);
  dino3 = new Dinosaur('velosiraptor', 'carnivore', 50);
  let dinos = [dino1, dino2, dino3];



  let park;

  beforeEach(function () {
    park = new Park("Jurassic Park", 20, dinos);
  });

  it('should have a name',function(){
    const actual = park.name;
    assert.strictEqual(actual, 'Jurassic Park')
  }
  );

  it('should have a ticket price', function(){
    const actual = park.ticketPrice;
    assert.strictEqual(actual, 20)
  }
  );

  it('should have a collection of dinosaurs', function (){
    const actual = park.dinosaurCollection.length
    assert.strictEqual(actual, 3)
  });

  it('should be able to add a dinosaur to its collection', function(){
    let newDino = Dinosaur ('Stegasoraus', 'herbivore', 60);

    park.addDinoaour(newDino);

    let actual = park.dinosaurCollection.length
    assert.strictEqual(actual, 4)
  });

  it('should be able to remove a dinosaur from its collection', function(){
    park.removeDinosaur(0);

    let actual = park.dinosaurCollection.length
    assert.strictEqual(actual, 3)
  });

  it('should be able to find the dinosaur that attracts the most visitors', function(){
    let actual = park.findMostPopular()
    assert.strictEqual(actual.species, 'Stegasoraus')
  });