Plant Discovery

function plantDiscovery(input) {
  let countPlants = Number(input.shift());

  let plants = {};
  let ratingCount = {};
  let rating = {};

  for (let i = 0; i < countPlants; i++) {
    let rowOfPlantInfo = input.shift();
    let [plant, rarity] = rowOfPlantInfo.split("<->");

    plants[plant] = Number(rarity);
    ratingCount[plant] = 0;
    rating[plant] = 0;
  }

  for (let row of input) {
    let [command, elements] = row.split(": ");

    if (command === "Exhibition") {
      console.log(`Plants for the exhibition:`);
      break;
    }

    if (command === "Rate") {
      let [plant, newRating] = elements.split(" - ");

      if (plants.hasOwnProperty(plant)) {
        rating[plant] += Number(newRating);
        ratingCount[plant] += 1;
      } else {
        console.log("error");
      }
    } else if (command === "Update") {
      let [plant, newRarity] = elements.split(" - ");

      if (plants.hasOwnProperty(plant)) {
        plants[plant] = Number(newRarity);
      } else {
        console.log("error");
      }
    } else if (command === "Reset") {
      if (ratingCount.hasOwnProperty(elements)) {
        rating[elements] = 0;
        ratingCount[elements] = 0;
      } else {
        console.log("error");
      }
    }
  }

  for (let plant in plants) {
    let avg = rating[plant] / ratingCount[plant];

    if (isNaN(avg)) {
      avg = 0;
    }

    console.log(
      `- ${plant}; Rarity: ${plants[plant]}; Rating: ${avg.toFixed(2)}`
    );
  }
}