NAME

FP::Array_sort - 'sensible' sorting setup

SYNOPSIS

use FP::Array_sort; # for `array_sort`, `on`, and `cmp_complement`
# For this example:
use FP::Ops 'number_cmp';
use FP::List 'car';
array_sort $ary, on \&car, \&number_cmp

DESCRIPTION

Perl's sort is rather verbose and uses repetition of the accessor code:

sort { &$foo ($a) <=> &$foo ($b) } @$ary

Abstracting the repetition of the accessor as a function (`on`) and wrapping sort as a higher-order function makes it more straight-forward:

array_sort $ary, on ($foo, \&number_cmp)

In method interfaces the need becomes more obvious: if $ary is one of the FP sequences (FP::PureArray, FP::List, FP::StrictList, FP::Stream) that supports `sort` (TODO) then:

$s->sort (on $foo, \&number_cmp)

or if the comparison function already exists:

$numbers->sort (\&number_cmp)

SEE ALSO

FP::Ops, FP::Combinators