CODEWITHSUNDEEP
javascripttypescriptoptimizationarray-maparray-reduce
Arnaw Gundawar
Arnaw Gundawar

Reputation: 1

Optimised Javascript/TS code to find the total quantity for each base item, when more than 1 cart item can be pointing to the same base item

I need the most efficient way to calculate the total quantity for each base item by going through a list of cart items and sum up the quantities for all cart items having the same base item.

My CartItem looks something like:

export interface CartItem {
    id: string;
    baseItem: BaseItem;
    quantity: number;
    addOns: string[]
}

export interface BaseItem {
    name: string;
    id: string;
}

There can be multiple CartItems for the same BaseItem basis the different AddOns / Variations.

My current solution is to use a Map, and it does work, however I think there could be a faster more optimised way of doing this.

      const itemQuantites: Map<string, number> = new Map<string, number>();
      cart.items.forEach(
        cartItem => {
          // Check for a match, else add it to the Map
          if (itemQuantites.has(cartItem.baseItem.id)) {
            const currentQuantity = itemQuantites.get(cartItem.baseItem.id) ?? 0;
            itemQuantites.set(cartItem.baseItem.id, currentQuantity + cartItem.quantity);
          }
          else {
            itemQuantites.set(cartItem.baseItem.id, cartItem.quantity);
          }
        }
      );

Upvotes: 0

Views: 36

Answers (0)

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