useCart

This section covers the useCart function.

The useCart hook is a custom hook commonly used in e-commerce or marketplace applications to manage the shopping cart functionality. This hook encapsulates the logic related to adding, removing, and updating items in a user's cart, providing an easy-to-use interface for managing cart operations.

Features

Add Items to Cart:

Allows users to add products to the cart.
Handles various item attributes like quantity, size, color, etc.
Updates the cart state when a new item is added.

Remove Items from Cart:

Provides functionality to remove items from the cart.
Handles the removal of individual items or all items at once.
Updates the cart state accordingly.

Update Item Quantity:

Allows users to increase or decrease the quantity of items in the cart.
Ensures inventory limits are respected when updating quantities.
Automatically recalculates the cart's total based on quantity changes.

View Cart Contents:

Retrieves and displays the current contents of the cart.
Provides an easy way to access items, their details, and the total cost.

Calculate Cart Totals:

Calculates the subtotal, taxes, discounts, and total amount of the cart.
Dynamically updates the totals as items are added, removed, or modified.
Handles complex pricing rules like tiered pricing, bulk discounts, and promotions.

Apply Discounts/Coupons:

Supports applying discount codes or coupons to the cart.
Validates the coupon and applies the discount to the cart total.
Handles various types of discounts, such as percentage-based or fixed-amount discounts.

Persistent Cart:

Persists the cart state across sessions using local storage, session storage, or a backend.
Restores the cart contents when the user returns to the site.

Clear Cart:

Provides a way to clear all items from the cart.
Typically used after a successful checkout or when the user wants to start over.

Cart Notifications:

Sends notifications to the user when items are added, removed, or updated.
Provides feedback on cart operations (e.g., "Item added to cart", "Coupon applied").

Checkout Integration:

Integrates with the checkout process to pass the cart contents to the order creation system.
Handles pre-checkout validations like ensuring items are still in stock.

Cross-Sell/Up-Sell Suggestions:

Suggests additional items based on the current contents of the cart.
Encourages users to add related products or upgrade their purchases.

Multi-Currency Support:

Handles cart totals and item prices in multiple currencies.
Automatically converts prices based on the user's selected currency.

Error Handling:

Manages errors related to adding, removing, or updating items.
Provides user-friendly messages when operations fail (e.g., "Out of stock").

Cart Validation:

Validates the cart contents before proceeding to checkout.
Ensures that all items are still available and that quantities are correct.

Custom Hooks for Advanced Features:

Sometimes includes advanced hooks for specific use cases, such as applying custom pricing logic, handling specific tax rules, or managing complex cart structures (e.g., carts with multiple shipments).

Usage

To use the useCart function, follow these steps:

Installation: Install the necessary package using npm or yarn.
```
npm install backchannel-library
```

Import: Import the function into your project.

import { useCart } from "backchannel-library";

Implementation: Implement the function in your code.

function App() {
  const data = useCart();
  return (
    <div>
      <pre>{JSON.stringify(data, null, 2)}</pre>
    </div>
  );
}

export default App;

Examples

Here are some examples of how to use the useCart function in different scenarios.

Basic Example

    function CartPage() {
      const { cartItems, cartTotal, addItem, removeItem, updateQuantity, clearCart } = useCart();

      return (
        <div>
          <h1>Shopping Cart</h1>
          {cartItems.map(item => (
            <div key={item.id}>
              <span>{item.name}</span>
              <span>{item.quantity}</span>
              <button onClick={() => updateQuantity(item.id, item.quantity + 1)}>+</button>
              <button onClick={() => removeItem(item.id)}>Remove</button>
            </div>
          ))}
          <h2>Total: ${cartTotal}</h2>
          <button onClick={clearCart}>Clear Cart</button>
        </div>
      );
    }

Parameters

Parameter	Type	Description
`paramName`	`type`	Description of the parameter

Conclusion

useOrder

usePayment