Reconfigured reducer logic to accept duplicate items in our cart and evaluate it so that it only increases the count of duplicate items.

Author: commit-kyle

specialtea/src/store/CartContext/CartProvider.js

@@ -9,10 +9,28 @@ const defaultCartState = {
 
 const cartReducer = (state, action) => {
 	if (action.type === 'ADD') {
-		const updatedItems = state.items.concat(action.item);
 		const updatedTotalAmount =
 			state.totalAmount + action.item.price * action.item.amount;
 
+		const existingCartItemIdx = state.items.findIndex(
+			item => item.id === action.item.id
+		);
+
+		const existingCartItem = state.items[existingCartItemIdx];
+
+		let updatedItems;
+
+		if (existingCartItem) {
+			const updatedItem = {
+				...existingCartItem,
+				amount: existingCartItem.amount + action.item.amount
+			};
+			updatedItems = [...state.items];
+			updatedItems[existingCartItemIdx] = updatedItem;
+		} else {
+			updatedItems = state.items.concat(action.item);
+		}
+
 		return {
 			items: updatedItems,
 			totalAmount: updatedTotalAmount,