We can easily specify default values for props in Nested.svelte:
Nested.svelte
<script> export let answer = 'a mystery'; </script>
If we now add a second component without an answer prop, it will fall back to the default:
answer
<Nested answer={42}/> <Nested />
Next: Spread props
<script>
import Nested from './Nested.svelte';
</script>
<Nested answer={42} />