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Part 3 / Advanced bindings / Each block bindings

You can even bind to properties inside an each block.

{#each todos as todo}
	<input
		type=checkbox
		bind:checked={todo.done}
	>

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

Note that interacting with these <input> elements will mutate the array. If you prefer to work with immutable data, you should avoid these bindings and use event handlers instead.

Next: Media elements

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<script>
	let todos = [
		{
			done: false,
			text: 'finish Svelte tutorial'
		},
		{ done: false, text: 'build an app' },
		{ done: false, text: 'world domination' }
	];
 
	function add() {
		todos = todos.concat({
			done: false,
			text: ''
		});
	}
 
	function clear() {
		todos = todos.filter((t) => !t.done);
	}
 
	$: remaining = todos.filter(
		(t) => !t.done
	).length;
</script>
 
<h1>Todos</h1>
 
{#each todos as todo}
	<div class:done={todo.done}>
		<input type="checkbox" checked={todo.done} />
 
		<input
			placeholder="What needs to be done?"
			value={todo.text}
		/>
	</div>
{/each}
 
<p>{remaining} remaining</p>
 
<button on:click={add}> Add new </button>
 
<button on:click={clear}>
	Clear completed
</button>
 
<style>
	.done {
		opacity: 0.4;
	}
</style>
initialising