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You can bind to properties inside an each block.

App
{#each todos as todo}
	<li class:done={todo.done}>
		<input
			type="checkbox"
			bind:checked={todo.done}
		/>

		<input
			type="text"
			placeholder="What needs to be done?"
			bind:value={todo.text}
		/>
	</li>
{/each}

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<script>
	let todos = $state([
		{ done: false, text: 'finish Svelte tutorial' },
		{ done: false, text: 'build an app' },
		{ done: false, text: 'world domination' }
	]);
 
	function add() {
		todos.push({
			done: false,
			text: ''
		});
	}
 
	function clear() {
		todos = todos.filter((t) => !t.done);
	}
 
	let remaining = $derived(todos.filter((t) => !t.done).length);
</script>
 
<div class="centered">
	<h1>todos</h1>
 
	<ul class="todos">
		{#each todos as todo}
			<li class:done={todo.done}>
				<input
					type="checkbox"
					checked={todo.done}
				/>
 
				<input
					type="text"
					placeholder="What needs to be done?"
					value={todo.text}
				/>
			</li>
		{/each}
	</ul>
 
	<p>{remaining} remaining</p>
 
	<button onclick={add}>
		Add new
	</button>
 
	<button onclick={clear}>
		Clear completed
	</button>
</div>
 
<style>
	.centered {
		max-width: 20em;
		margin: 0 auto;
	}
 
	.done {
		opacity: 0.4;
	}
 
	li {
		display: flex;
	}
 
	input[type="text"] {
		flex: 1;
		padding: 0.5em;
		margin: -0.2em 0;
		border: none;
	}
</style>