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22 lines
701 B
TypeScript
22 lines
701 B
TypeScript
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import { Category } from "./types"
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export function visitCategoryTree(category: Category, visitor: (category: Category) => void): void {
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visitor(category)
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category.children.forEach(child => visitCategoryTree(child, visitor))
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}
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export function flattenCategoryTree(category: Category): Category[] {
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const categories: Category[] = []
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visitCategoryTree(category, c => categories.push(c))
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return categories
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}
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export function categoryUnreadCount(category?: Category): number {
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if (!category) return 0
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return flattenCategoryTree(category)
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.flatMap(c => c.feeds)
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.map(f => f.unread)
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.reduce((total, current) => total + current, 0)
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}
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