01
Write a Redux Toolkit slice for a cart.
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const cartSlice = createSlice({
name: 'cart',
initialState: { items: [] },
reducers: {
addItem(state, action) {
const existing = state.items.find((i) => i.id === action.payload.id);
if (existing) existing.qty += 1;
else state.items.push({ ...action.payload, qty: 1 });
},
removeItem(state, action) {
state.items = state.items.filter((i) => i.id !== action.payload);
},
},
});
export const { addItem, removeItem } = cartSlice.actions;
export const selectTotal = (s) => s.cart.items.reduce((t, i) => t + i.price * i.qty, 0);