svelte/documentation/tutorial/04-logic/05-keyed-each-blocks/app-a/Thing.svelte

<script>
	import { onDestroy } from 'svelte';

	const emojis = {
		apple: '🍎',
		banana: '🍌',
		carrot: '🥕',
		doughnut: '🍩',
		egg: '🥚'
	};

	// the name is updated whenever the prop value changes...
	export let name;

	// ...but the "emoji" variable is fixed upon initialisation of the component
	const emoji = emojis[name];

	// observe in the console which entry is removed
	onDestroy(() => {
		console.log('thing destroyed: ' + name);
	});
</script>

<p>
	<span>The emoji for {name} is {emoji}</span>
</p>

<style>
	p {
		margin: 0.8em 0;
	}
	span {
		display: inline-block;
		padding: 0.2em 1em 0.3em;
		text-align: center;
		border-radius: 0.2em;
		color: #333333;
		background-color: #ffdfd3;
	}
</style>