src/lib/shared/group-by-category.ts


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export function groupByCategory<
	TItem extends { categoryName: string | null },
	TCategory extends { name: string },
>(items: TItem[], categories: TCategory[]): [string, TItem[]][] {
	const groups = new Map<string, TItem[]>();
	for (const item of items) {
		const key = item.categoryName ?? 'Non catégorisé';
		const list = groups.get(key);
		if (list) list.push(item);
		else groups.set(key, [item]);
	}

	const result: [string, TItem[]][] = [];
	for (const cat of categories) {
		const list = groups.get(cat.name);
		if (list?.length) result.push([cat.name, list]);
	}
	const uncategorized = groups.get('Non catégorisé');
	if (uncategorized?.length) {
		result.unshift(['Non catégorisé', uncategorized]);
	}
	return result;
}