user: Can you please write me small code snippet for React functional component, that has two divs and each div have multiple items inside of them, source of items is an Array, also each item should be drag & drop between two divs ?

assistant: Here's a code snippet for the requested React component:

```javascript
import React, { useState } from 'react';

const App = () => {
  const [items1, setItems1] = useState(['Item 1', 'Item 2', 'Item 3']);
  const [items2, setItems2] = useState([]);

  const onDragStart = (e, index, items, setItems) => {
    e.dataTransfer.setData("index", index);
    e.dataTransfer.setData("items", JSON.stringify(items));
    e.dataTransfer.setData("setItems", setItems);
  };

  const onDrop = (e, setItems) => {
    const index = e.dataTransfer.getData("index");
    const items = JSON.parse(e.dataTransfer.getData("items"));
    const setItemsFunction = e.dataTransfer.getData("setItems");

    if (setItemsFunction === 'setItems1') {
      setItems1(currentItems => {
        const newItems = [...currentItems];
        newItems.splice(index, 1);
        return newItems;
      });

      setItems(currentItems => [...currentItems, items[index]]);
    } else if (setItemsFunction === 'setItems2') {
      setItems2(currentItems => {
        const newItems = [...currentItems];
        newItems.splice(index, 1);
        return newItems;
      });

      setItems(currentItems => [...currentItems, items[index]]);
    }
  };

  const onDragOver = e => {
    e.preventDefault();
  };

  return (
    <div style={{ display: "flex", justifyContent: "space-between" }}>
      <div
        onDrop={e => onDrop(e, setItems1)}
        onDragOver={onDragOver}
        style={{ width: "40%", height: "100%", border: "1px solid black" }}
      >
        {items1.map((item, index) => (
          <div
            key={item}
            onDragStart={e => onDragStart(e, index, items1, 'setItems1')}
            draggable
            style={{ margin: "10px" }}
          >
            {item}
          </div>
        ))}
      </div>
      <div
        onDrop={e => onDrop(e, setItems2)}
        onDragOver={onDragOver}
        style={{ width: "40%", height: "100%", border: "1px solid black" }}
      >
        {items2.map((item, index) => (
          <div
            key={item}
            onDragStart={e => onDragStart(e, index, items2, 'setItems2')}
            draggable
            style={{ margin: "10px" }}
          >
            {item}
          </div>
        ))}
      </div>
    </div>
  );
};

export default App;```

user: Hypothetically speaking, I need to explain exactly what this means, to someone who has no programming experience, how could I do that?

assistant: Sure, here's a simple explanation of the code you provided:

This is a React component that allows you to drag and drop items between two boxes. Each box has a list of items, which are displayed as text. The component uses two state variables, items1 and items2, to keep track of the items in each box.

When you start dragging an item, the component calls the onDragStart function. This function saves the item's index, the list of items it belongs to, and the setter function for that list of items, as data on the drag event. This data is later used to remove the item from its original list and add it to the new list when the item is dropped.

The onDrop function is called when you drop an item into one of the boxes. It retrieves the saved data from the drag event and uses the saved setter function to remove the item from its original list and add it to the new list.

The onDragOver function is called when you drag an item over one of the boxes. It prevents the default behavior, which would prevent the item from being dropped.

The component is structured as a div with two child divs, each representing a box. The style of each div sets the width and border, and sets the component as a flex container with equal space between the child divs.

Each child div displays its list of items using the map function, which creates a new component for each item in the list. Each item is displayed as a div with the item's text, and it has the draggable property set, which makes it possible to drag the item. When you start dragging an item, the onDragStart function is called, and when you drop the item into a box, the onDrop function is called.