Recipe Search Suggestions
Patterns for building fast, relevant autocomplete and suggestion systems for recipe search.
Prefix Matching
Index recipe titles in a trie or inverted index keyed by lowercase tokens. On each keystroke, traverse the trie and return the top 8 matches ranked by popularity or recency. Keep latency under 50ms by caching the top 500 queries in memory.
Ingredient-Aware Suggestions
Parse the query for ingredient keywords (“chicken”, “garlic”) and boost recipes where those ingredients appear early in the list. Use a separate ingredient-to-recipe mapping table updated on each recipe publish.
Typo Tolerance
Apply Damerau-Levenshtein distance with a threshold of 2 for queries under 12 characters. For longer queries, fall back to trigram similarity. Always prefer exact prefix matches over fuzzy results in the suggestion order.
Personalization Signals
Weight suggestions by the user's recent views, saved recipes, and dietary preferences. Store a lightweight preference vector client-side and merge it with server-side ranking on each request.
Debounce & Cancellation
Debounce input by 150ms. Use an AbortController per request so stale in-flight fetches are cancelled when a new keystroke arrives. Render only the most recent response.