If you have multiple inputs relating to the same value, you can use bind:group along with the value attribute. Radio inputs in the same group are mutually exclusive; checkbox inputs in the same group form an array of selected values.

Add bind:group to each input:

<input type=radio bind:group={scoops} name="scoops" value={1}>

In this case, we could make the code simpler by moving the checkbox inputs into an each block. First, add a menu variable to the <script> block...

let menu = [
  'Cookies and cream',
  'Mint choc chip',
  'Raspberry ripple'
];

...then replace the second section:

<h2>Flavours</h2>

{#each menu as flavour}
  <label>
    <input type=checkbox bind:group={flavours} name="flavours" value={flavour}>
    {flavour}
  </label>
{/each}

It's now easy to expand our ice cream menu in new and exciting directions.