Released Result::Simple – a dead simple perl-ish Result like F#, Rust, Go

https://metacpan.org/pod/Result::Simple

Result::Simple is a dead simple Perl-ish Result.

Result represents a function’s return value as success or failure, enabling safer error handling and more effective control flow management. This pattern is used in other languages such as F#, Rust, and Go.

In Perl, this pattern is also useful, and this module provides a simple way to use it. This module does not wrap a return value in an object. Just return a tuple like ($data, undef) or (undef, $err). For example, take a look at a implement of Ok function:

# When the function is successful, it should return this.
sub Ok {
    if (CHECK_ENABLED) {
        croak "`Ok` must be called in list context" unless wantarray;
        croak "`Ok` does not allow multiple arguments" if @_ > 1;
        croak "`Ok` does not allow no arguments" if @_ == 0;
    }
    ($_[0], undef)
}

It is a dead simple!

However, it decreases the bugs. For instance, if you forget to handle $err, it can be detected by Perl::Critic::Policy::Variables::ProhibitUnusedVarsStricter. This is one of effectiveness of Result pattern!

Feel free to give it a try!

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This blog is for Japanese perl advent calendar 2024.