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Explaining it from the ground up. I just talked to a security guard at Railsconf who was curious about what "Rails" was. Trying to explain programming from the absolute basics is really tough.


Two things:

  1. Cache invalidation
  2. Naming things
  3. Off-by-one errors

Talking about learning the basics, I remember that a lot of students in my school where struggling with array starting at 0; ending at n-1 and same for the for loop