Repeated Code is a Mistake

• It is nearly always possible to eliminate repeated code

• Almost every feature of every programming language is an attempt to prevent repeated code

• Tiny example: $x->{q} += $y instead of $x->{q} = $x->{q} + $y

• Larger example: Small-scope variables

• Larger still: while and for loops

• Larger: Subroutines

• Larger: Object-oriented inheritance

• Larger: Modules

• Larger: Pipes

• Huge: Shared libraries

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Copyright © 2006 M. J. Dominus