AddToCart

//CartService
const CART_KEY = 'cartItems';

@Injectable()
export class CartProvider {

  constructor(public storage: Storage) { }

  addToCart(product) {
    return this.getCartItems().then(result => {
      if (result) {
        if (!this.containsObject(product, result)) {
          result.push(product);
          return this.storage.set(CART_KEY, result);
        } else {
          let index = result.findIndex(x => x.product_id == product.product_id);
          let prevQuantity = parseInt(result[index].count);
          product.count = (prevQuantity + product.count);
          let currentPrice = (parseInt(product.totalPrice) * product.count);
          product.totalPrice = currentPrice;
          result.splice(index, 1);
          result.push(product);
          console.log(result)
          return this.storage.set(CART_KEY, result);
        }

      } else {
        console.log(product);
        return this.storage.set(CART_KEY, [product]);
      }
    })
  }

  getCartItems() {
    return this.storage.get(CART_KEY);
  }

  removeFromCart(product,i) {
    return this.getCartItems().then(result => {
      if (result) {
        result.indexOf(product);
        result.splice(i, 1);
        return this.storage.set(CART_KEY, result);
      }
    })
  }

  removeAllCartItems() {
    return this.storage.remove(CART_KEY).then(res => {
      return res;
    });
  }

  containsObject(obj, list): boolean {
    if (!list.length) {
      return false;
    }

    if (obj == null) {
      return false;
    }
    var i;
    for (i = 0; i < list.length; i++) {
      if (list[i].product_id == obj.product_id) {
        return true;
      }
    }
    return false;
  }

}
//CartPage.ts
removeItem(itm: string, i) {
    console.log(itm);
    this.cartService.removeFromCart(itm, i).then(() =>
      this.loadCartItems()
    )
    if (this.cartItems.length > 0) {
      this.cartItems.forEach((v) => {
        this.totalAmount -= parseInt(v.totalPrice);
      });
      // this.isEmptyCart = true;
    }
  }

//CartPage.html
 <span class="remove" (click)="removeItem(itm,i)">