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>