svelte/test/runtime/samples/computed-function/main.html

<script>
	export let domain = [ 0, 10 ];
	export let range = [ 0, 100 ];
	export let x = 5;

	function scale() {
		return num => {
			const t = domain[0] + ( num - domain[0] ) / ( domain[1] - domain[0] );
			return range[0] + t * ( range[1] - range[0] );
		}
	}
</script>

<p>{scale()(x)}</p>