Minimal Perl

Chapter 11. Subroutines and variable scoping

11.1	Compartmentalizing code with subroutines	363
11.2	Common problems with variables	370
11.3	Controlling variable scoping	373
11.4	Variable Scoping Guidelines for complex programs	376
11.5	Reusing a subroutine	386
11.6	Summary	387

Thinking logically may come naturally to Vulcans like Star Trek’s Mr. Spock, but it’s a challenge for most earthlings. That’s what those millions of VCRs and microwave-ovens blinking 12:00 ... 12:00 ... 12:00—since the 1980s—have been trying to tell us.

What’s more, even those who excel in logical thinking can experience drastic degradations in performance when subjected to time pressures, sleep deprivation, frequent interruptions, tantalizing daydreams, or problems at home—i.e., under normal ...