store provition1 - fundamentals

function storeProvision(store = [], delivery = []) {
  let result = [];
  class Store {
    constructor(productName, quantity) {
      this.productName = productName;
      this.quantity = quantity;
    }
  }
  for (let i = 0; i < store.length; i++) {
    if (i % 2 !== 0) {
      store[i] = +store[i];
    }
  }
  for (let i = 0; i < delivery.length; i += 2) {
    if (store.includes(delivery[i])) {
      let index = store.indexOf(delivery[i]);
      store[index + 1] += +delivery[i + 1];
    } else {
      store.push(delivery[i]);
      store.push(delivery[i + 1]);
    }
  }

  for (let i = 0; i < store.length; i += 2) {
    p = new Store(store[i], store[i + 1]);
    result.push(p);
  }

  for (const key of result) {
    console.log(`${key.productName} -> ${key.quantity}`);
  }
}