I agree totally with Zaxo here. References are very important, and should be done first, and in a great deal of detail. This is the order in which I would attempt explaining references:
- Argument passing and returning. Passing a list, and returning a list.
- Passing modifiable variables (pass by reference).
- Passing and returning whole arrays and hashes by reference.
- Anonymous arrays and hashes.
- Multi-dimensional arrays.
- Arrays of hashes, hashes of hashes, hashes of arrays.
- Introduce polymorphism and reflection - the ref function.
- Data::Dumper
- Plenty of exercises on references, then students should be ready for tackling perl objects and classes.
hth
--rW
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