FP::Abstract::Pure - functional purity protocol
my $v = list(1); # or any other data structure that implements
is $v->$_isa("FP::Abstract::Pure"), 1;
# but usually:
is_pure($v) # true if $v does (officially) not support mutation
Base class for all data structures that don't allow mutation (by ordinary programs), i.e. are persistent.
More precisely, those objects that don't have methods that when called make other methods non-functions.
This is alpha software! Read the status section in the package README or on the website.
To install FunctionalPerl, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell
For more information on module installation, please visit the detailed CPAN module installation guide.