Trie vs. Hash Table

Comparison between trie and hash tables

Both of these data structures can be used for the same job, but their performance would vary based on the nature of your program. Take a look at some of the factors you need to keep in mind when deciding the appropriate data structure.

Basic operations

On average, hash tables can perform search, insertion, and deletion in constant time. Whereas trie usually works in O(n). However, in the worst-case, the performance of hash tables can come down to O(n) where n is the total number of hash entries. Whereas, the trie in the worst-case can take O(n*m).

Hash function

An efficient hash table requires a smart hash function that would distribute the keys over all the space that is available to you. A trie is simpler to implement in this regard as it accesses extra space only when needed, and hash functions are not required to optimize its structure.

Order of data

If your application needs data ordered in a specific sequence, trie will prove more useful because its tree structure helps maintain the order. Hash tables are the smarter choice if your data can be stored randomly.

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