Perl Best Practices [Electronic resources] نسخه متنی

B.8. Chapter 9, Subroutines

• Call subroutines with parentheses but without a leading &. [Call Syntax ]

• Don't give subroutines the same names as built-in functions. [Homonyms ]

• Always unpack @_ first. [Argument Lists ]

• Use a hash of named arguments for any subroutine that has more than three parameters. [Named Arguments ]

• Use definedness or existence to test for missing arguments. [Missing Arguments ]

• Resolve any default argument values as soon as @_ is unpacked. [Default Argument Values ]

• Always return scalar in scalar returns. [Scalar Return Values ]

• Make list-returning subroutines return the "obvious" value in scalar context. [Contextual Return Values ]

• When there is no "obvious" scalar context return value, consider Contextual::Return instead. [Multi-Contextual Return Values ]

• Don't use subroutine prototypes. [Prototypes ]

• Always return via an explicit return. [Implicit Returns ]

• Use a bare return to return failure. [Returning Failure ]