Actions are the only way to trigger changes to the store's state.

Actions are simple POJOs with a mandatory type key and optional payload keys containing new info.

Actions get sent using store.dispatch() and are the primary drivers of the Redux loop.

When an action is dispatched, any new state data must be passed along ad the payload.

The example below passed a payload key of fruit with the new state data. 'orange':

    const addOrange = {
        type: "ADD_FRUIT",
        fruit: 'orange',
    }

    store.dispatch(addOrange);
    console.log(store.getState()); // ['orange']

However, when these action payloads are generated dynamically, it becomes necessary to extrapolate the creation of the action object into a function.

These functions are called action creators.

The JavaScript objects they return are the actions.

To initiate a dispatch, you pass the result of calling an action creator to store.dispatch()

For Example, an action creator function to create "ADD_FRUIT" action looks like this:

    const addFruit = (fruit) => {
            type: "ADD_FRUIT",
            fruit,
    }

Now we can add any fruit to the store using our action creator addFruit(fruit), instead of having to define an object for each fruit:

    store.dispatch(addFruit('apple'));
    store.dispatch(addFruit('strawberry'));
    store.dispatch(addFruit('lychee'));
    console.log(store.getState()); // [ 'orange', 'apple', 'strawberry', 'lychee' ]

Update your actions to include 'ADD_FRUIT', 'ADD_FRUITS', 'SELL_FRUIT', and 'SELL_OUT':

    const ADD_FRUIT = 'ADD_FRUIT';
    const ADD_FRUITS = 'ADD_FRUITS';
    const SELL_FRUIT = 'SELL_FRUIT';
    const SELL_OUT = 'SELL_OUT';

    const addFruit = (fruit) => ({
    type: ADD_FRUIT,
    fruit,
    });

    const addFruits = (fruits) => ({
    type: ADD_FRUITS,
    fruits,
    });

    const sellFruit = (fruit) => ({
    type: SELL_FRUIT,
    fruit,
    });

    const sellOut = () => ({
    type: SELL_OUT,
    });

Cnstants are used for all the fruit action types.

This is to prevent simple typos in the reducers case clauses

Check repo folder