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<script lang="ts">
import { DateTime } from "luxon";
const getCurrentYear = () => DateTime.now().year;
const getRelative = (year: number) =>
DateTime.local(year).toRelative({ locale: "en" })!;
let year = $state(getCurrentYear());
let sqrt = $derived(year ** 0.5);
let isPerfectSquare = $derived(Number.isInteger(sqrt));
let lastSqrt = $derived(isPerfectSquare ? sqrt - 1 : Math.floor(sqrt));
let nextSqrt = $derived(isPerfectSquare ? sqrt + 1 : Math.ceil(sqrt));
let last = $derived(lastSqrt ** 2);
let next = $derived(nextSqrt ** 2);
let nextRelative: string = $state("");
const update = () => {
year = getCurrentYear();
nextRelative = getRelative(next);
};
update();
setInterval(update, 500);
</script>
<div id="container">
<h1>Is the year a perfect square?</h1>
{#if isPerfectSquare}
<div id="answer">Yes.</div>
<strong>{sqrt}</strong><sup>2</sup> = {year}.
{:else}
<div id="answer">No.</div>
{/if}
The last was
<ruby>{last}<rp> (</rp><rt>{lastSqrt}<sup>2</sup></rt><rp>)</rp></ruby>, and
the next is
<ruby>{next}<rp> (</rp><rt>{nextSqrt}<sup>2</sup></rt><rp>)</rp></ruby>, {nextRelative}!
</div>
<style>
#container {
text-align: center;
font-size: 2rem;
}
h1 {
font-size: inherit;
margin: 0;
font-weight: normal;
}
#answer {
font-size: 5em;
margin: 0;
font-weight: bold;
font-family: sans-serif;
}
</style>
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