Plant Discovery JS Fundamentals

function plantDiscovery(array) {
  let n = +array.shift();

  let list = {};
  for (let i = 0; i < n; i++) {

    let [plant, rarity] = array.shift().split(`<->`);
    rarity = +rarity;

    if (list.hasOwnProperty(plant) == false) {
      list[plant] = { rarity: 0, rating: [] };
    }
    list[plant].rarity += rarity;
  }

  while (array[0] != "Exhibition") {

    let line = array.shift();
    let tokens = line.split(`: `);
    let currPlant = tokens[1].split(` - `);
    let name = currPlant[0];

    if (list.hasOwnProperty(name)) {

      if (tokens[0] == "Rate") {
        let rating = +currPlant[1];
        list[name].rating.push(rating);
      }

      if (tokens[0] == "Update") {
        let newRarity = +currPlant[1];
        list[name].rarity = newRarity;
      }

      if (tokens[0] == "Reset") {
        list[name].rating = [];
      }
    } else {
      console.log(`error`);
    }
  }

  console.log(`Plants for the exhibition:`);
  for (let currPlant in list) {

    let average = 0;
    for (let currRating of list[currPlant].rating) {
      average += currRating;
    }

    if (list[currPlant].rating.length !== 0) {
      average /= list[currPlant].rating.length;
    }

    console.log(`- ${currPlant}; Rarity: ${list[currPlant].rarity}; Rating: ${average.toFixed(2)}`);
  }
}