Designing a System that would detect typos and suggestions

This was asked in an interview.

I think the answer can be done by constructing a trie of all valid words and then suggestions can be made based on a possible valid path which wa开发者_开发知识库s otherwise given as incorrect.

Say if user types apfle, and system would detect that after ap a possible valid path was app, which would then satisfy apple.

Is there any better solution than this? Perhaps the one implemented by spell checkers.

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See:

How does the Google "Did you mean?" Algorithm work?

How do I approximate "Did you mean?" without using Google?

How to write a spelling corrector

Youtube Video: Search 101

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Within typical search engines you will find a lot of Analyzer stuff, which directs to the same underlying problem. A very popular Analyzer would be the n-gram Analyzer.

Perhaps this helps.