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_config/filters.js

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+export default function (eleventyConfig) {
+
+	/* Create a single alt string from a multi-string alt object */
+	eleventyConfig.addFilter("createAlt", (altObject) => {
+		let alt;
+
+		if (altObject.length > 1)
+			alt = `a ${altObject.length} picture collage.`;
+		for (let i = 0; i < altObject.length; i++)
+			alt += ` Image ${i + 1} is ${altObject[i]}`;
+
+		return alt;
+	});
+
+	/* 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;
+	});
+
+};