wig ( where is grep )
Make grep prettier, put a wig on it!
my @even = @numbers.where(* %% 2);
my @matches = @data.where(/pattern/);
my @prod_servers = @servers.where(*.status eq 'Production');
my @jpgs = %*ENV<HOME>.IO.dir.where: *.basename.ends-with( '.jpg' | '.jpeg' );
This module adds a new method (and function) called
where that is essentially an 'alias' for
grep is kind of a misnomer, and unfamiliar to a lot of people. Using
where allows you to filter items in a way that reads much more like English, particularly when used in the method form.
This idea was originally a language proposal and my hope is that it makes its way into the language proper.
I like the idea of "where" instead of "grep" - lizmat
Limitations / Issues
Rakudo currently has a cache invalidation issue where child classes don't automatically inherit augmented methods from a Parent class (in this case, the Any class).
Until this is fixed, the work around is is to call
.^compose on your desired child classes. I haven't called it on every class under Any (there's a lot!), just the ones
grep is used with commonly.
If a class hasn't been recomposed and you try to call
where on it, Rakudo will report the error
Method 'where' not found for invocant of class 'ClassName'.
As a quickfix, just call
use wig;. Alternatively you can modify the module source.
If you think I've missed a very important class that I shouldn't have, please let me know (Issues | Submit a PR | irc://freenode, #perl6, user: perlawhirl).
Artistic. Refer to the LICENSE file in the distribution.