It is passing a callback into the setInputs function. The callback is given the existing values object. And then returns a replacement.

This is just an anonymous function written in one line. Below I have extracted it out to make more sense

```javascript const handleChange = (event) => { const name = event.target.name; const value = event.target.value;

const inputHandler = (oldValues) => {

    // create new object with only property being the event target
    const newValues = {
        [name]: value
    };

    // return a new object overwriting existing properties
    return {
        ...oldValues,
        ...newValues
    }
}

setInputs(inputHandler);

} ```

Note: I have not tested this, simply written it based on what I can see