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PerlMonks
the basic datatypes, three
Data Type: Scalar
Scalars: How They Work (about numbers, text strings, and binary strings)
by
vroom
Data Type: Array
Arrays: A Tutorial/Reference
by
jdporter
Multidimensional Arrays
by
CharlesClarkson
Data Type: Hash
Not Exactly a Hash Tutorial
by
planetscape
Hash Keys (strings or numbers?)
by
robot_tourist
The Uniqueness of hashes.
by
injunjoel
True and False (aka Booleans)
True or False? A Quick Reference Guide
by
bobf
References
intro to references
by
busunsl
References quick reference
by
tye
Arrays and hashes only with references
by
grizzley