f(f(x)) = f(x)

This property is called idempotent.

What has this got to do with software?

Enterprise software constantly deals with upgrading data. Of course, as this is a very challenging and complex task, most small/medium s/w companies, I believe, don’t invest time and effort doing this. But that’s a different topic. However, if one were to embark up on such upgrades, one of the things that’s required is to make the upgrades idempotent.

Writing the upgrades that are idempotent ensures there is no data corruption and that the scripts are run faster.

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