From the course: Perl 5 Essential Training
Join today to access over 22,600 courses taught by industry experts or purchase this course individually.
Understanding functions - Perl Tutorial
From the course: Perl 5 Essential Training
Understanding functions
- [Voiceover] Like most languages, Perl provides support for user-defined functions. In some languages, there's a distinction between functions and subroutines where functions return value, and subroutines do not. Perl does not make this distinction. The official Perl documentation uses both words, subroutine and function, interchangeably and without explanation. For my purposes, I prefer the word function. I rarely use the word subroutine. In Perl, a function is defined with the keyword "sub," followed by the name of the function, and a block of code in curly brackets. Perameters are passed in the special default array variable. Like the default scaler variable, the name of the defaul array variable is an underscore character preceded by the at symbol, which makes it an array. The built in shift function is commonly used to access function parameters. It uses the default array variable if an array is not specified. To return a value from a function, use the return statement. The…
Practice while you learn with exercise files
Download the files the instructor uses to teach the course. Follow along and learn by watching, listening and practicing.
Download courses and learn on the go
Watch courses on your mobile device without an internet connection. Download courses using your iOS or Android LinkedIn Learning app.