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Basic Svelte Bindings Group inputs

If you have multiple type="radio" or type="checkbox" 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={scoops} to the radio inputs...

App
<input
	type="radio"
	name="scoops"
	value={number}
	bind:group={scoops}
/>

...and bind:group={flavours} to the checkbox inputs:

App
<input
	type="checkbox"
	name="flavours"
	value={flavour}
	bind:group={flavours}
/>

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<script>
	let scoops = $state(1);
	let flavours = $state([]);
 
	const formatter = new Intl.ListFormat('en', { style: 'long', type: 'conjunction' });
</script>
 
<h2>Size</h2>
 
{#each [1, 2, 3] as number}
	<label>
		<input
			type="radio"
			name="scoops"
			value={number}
		/>
 
		{number} {number === 1 ? 'scoop' : 'scoops'}
	</label>
{/each}
 
<h2>Flavours</h2>
 
{#each ['cookies and cream', 'mint choc chip', 'raspberry ripple'] as flavour}
	<label>
		<input
			type="checkbox"
			name="flavours"
			value={flavour}
		/>
 
		{flavour}
	</label>
{/each}
 
{#if flavours.length === 0}
	<p>Please select at least one flavour</p>
{:else if flavours.length > scoops}
	<p>Can't order more flavours than scoops!</p>
{:else}
	<p>
		You ordered {scoops} {scoops === 1 ? 'scoop' : 'scoops'}
		of {formatter.format(flavours)}
	</p>
{/if}