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svelte/site/content/examples/03-logic/04-keyed-each-blocks/App.svelte

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<script>
import Thing from './Thing.svelte';
let things = [
{ id: 1, color: 'darkblue' },
{ id: 2, color: 'indigo' },
{ id: 3, color: 'deeppink' },
{ id: 4, color: 'salmon' },
{ id: 5, color: 'gold' }
];
function handleClick() {
things = things.slice(1);
}
</script>
<button on:click={handleClick}>
Remove first thing
</button>
<div style="display: grid; grid-template-columns: 1fr 1fr; grid-gap: 1em">
<div>
<h2>Keyed</h2>
{#each things as thing (thing.id)}
<Thing current={thing.color}/>
{/each}
</div>
<div>
<h2>Unkeyed</h2>
{#each things as thing}
<Thing current={thing.color}/>
{/each}
</div>
</div>