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_config/filters.js

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+import { DateTime } from "luxon";
+
+export default function (eleventyConfig) {
+	/* Return the keys used in an object */
+	eleventyConfig.addFilter("getKeys", (target) => {
+		return Object.keys(target);
+	});
+
+	/* Return n elements from a list */
+	eleventyConfig.addFilter("head", (collection = [], n) => {
+		if (!Array.isArray(collection) || collection.length === 0) {
+			return [];
+		}
+		if (n < 0) {
+			return collection.slice(n);
+		}
+
+		return collection.slice(0, n);
+	});
+
+	/* For <time> elements */
+	eleventyConfig.addFilter("htmlDateString", (dateObj) => {
+		return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat("yyyy-LL-dd");
+	});
+
+	/* What it says on the tin */
+	eleventyConfig.addFilter("randomize", function (array) {
+		// Create a copy of the array to avoid modifying the original
+		let shuffledArray = array.slice();
+
+		// Fisher-Yates shuffle algorithm
+		for (let i = shuffledArray.length - 1; i > 0; i--) {
+			const j = Math.floor(Math.random() * (i + 1));
+			[shuffledArray[i], shuffledArray[j]] = [
+				shuffledArray[j],
+				shuffledArray[i],
+			];
+		}
+
+		return shuffledArray;
+	});
+
+	/* Human-readable dates */
+	eleventyConfig.addFilter("readableDate", (dateObj, zone) => {
+		return DateTime.fromJSDate(dateObj, { zone: zone || "utc" }).toLocaleString(
+			DateTime.DATE_FULL,
+		);
+	});
+
+	/* Filter out structural tags */
+	eleventyConfig.addFilter("removeBasicTags", (tags) => {
+		return tags.filter((tag) => ["all"].indexOf(tag) === -1);
+	});
+
+	/* What it says on the tin */
+	eleventyConfig.addFilter("sortAlphabetically", (strings) =>
+		(strings || []).sort((b, a) => b.localeCompare(a)),
+	);
+}