Did you ever write an indexer or search engine? It can be pretty easy as long as you have small amounts of data. That is a few hundreds of megabytes is no big deal to search naively on todays hardware.

But if were talking about gigabytes or even terabytes of data, you will need to bring up some more sophisticated trickery to stay performant. This is where you start creating indices of word stems, positions and frequency.

Stemming and indexing are already whole fields on their own. Search Wikipedia for Stemming and Database Index to learn more.

Now imagine that a search engine does all that plus fast data storage and retrieval. Crazy! That’s why I just use a library instead 😅

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