NAME

Hash-with - Roles for automatically mapping keys in hashes

SYNOPSIS

use Hash-with;

my %h1 does Hash-lc = A => 42;             # map all keys to lowercase
say %h1<a>;    # 42

my %h2 does Hash-uc = a => 42;             # map all keys to uppercase
say %h2<A>;    # 42

sub ordered($a) { $a.comb.sort.join }
my %h3 does Hash-with[&ordered] = oof => 42;  # sort characters of key
say %h3<foo>;  # 42

DESCRIPTION

Hash::with provides several roles that can be mixed in with a Hash.

Hash-lc

The role that will convert all keys of a hash to their lowercase equivalent before being used to access the hash.

my %h1 does Hash-lc = A => 42;             # map all keys to lowercase
say %h1<a>;    # 42

This is in fact an optimized version of does Hash-with[&lc].

Hash-uc

The role that will convert all keys of a hash to their uppercase equivalent before being used to access the hash.

my %h2 does Hash-uc = a => 42;             # map all keys to uppercase
say %h2<A>;    # 42

This is in fact an optimized version of does Hash-with[&uc].

Hash-with

The role that will convert all keys of a hash according to a mapper function before being used to access the hash.

sub ordered($a) { $a.comb.sort.join }
my %h3 does Hash-with[&ordered] = oof => 42;  # order all keys
say %h3<foo>;  # 42

AUTHOR

Elizabeth Mattijsen liz@raku.rocks

Source can be located at: https://github.com/lizmat/Hash-with . Comments and Pull Requests are welcome.

If you like this module, or what I’m doing more generally, committing to a small sponsorship would mean a great deal to me!

COPYRIGHT AND LICENSE

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.