Global variables

• The big loop has:

     427                compare_by_md5_sum (@$array_ref);  # results in @md5_LoL

     445            compare_by_fc (@$array_ref);  # results in @fc_LoL

• Functions should avoid using global variables

• Why do we have functions?

• For modularity

  • Benefit 1: Understand the function in isolation

  • Benefit 2: Reuse the function in another program

• Using global variables in functions defeats both of these

• Use functional parameter-passing mechanisms wherever possible

• Global Variables are red flags

Next

Copyright © 2006 M. J. Dominus